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WO2015105011A1 - Low-hydrogen type coated arc welding electrode - Google Patents

Low-hydrogen type coated arc welding electrode Download PDF

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Publication number
WO2015105011A1
WO2015105011A1 PCT/JP2014/084438 JP2014084438W WO2015105011A1 WO 2015105011 A1 WO2015105011 A1 WO 2015105011A1 JP 2014084438 W JP2014084438 W JP 2014084438W WO 2015105011 A1 WO2015105011 A1 WO 2015105011A1
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WO
WIPO (PCT)
Prior art keywords
mass
coating
compound
total
arc welding
Prior art date
Application number
PCT/JP2014/084438
Other languages
French (fr)
Japanese (ja)
Inventor
良彦 北川
洋平 片野
章泰 片岡
Original Assignee
株式会社神戸製鋼所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to MYPI2016702453A priority Critical patent/MY184309A/en
Priority to KR1020167017987A priority patent/KR101827193B1/en
Priority to CN201480072045.8A priority patent/CN105873717B/en
Priority to SG11201604856XA priority patent/SG11201604856XA/en
Publication of WO2015105011A1 publication Critical patent/WO2015105011A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3602—Carbonates, basic oxides or hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3603—Halide salts
    • B23K35/3605—Fluorides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3607—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials

Definitions

  • the present invention relates to a low hydrogen-based coated arc welding rod in which a steel core wire is coated with a low hydrogen-based coating agent. More specifically, the present invention relates to a technique for improving the moisture absorption resistance of a low hydrogen-based coated arc welding rod.
  • Patent Document 1 proposes a coated arc welding rod in which glass powder is blended with a coating agent.
  • Patent Documents 2 to 4 propose a coated arc welding rod using an alkali metal silicate aqueous solution as a coating agent fixing agent.
  • the main object of the present invention is to provide a low hydrogen-based arc welding rod capable of improving the moisture absorption resistance without deteriorating the fixing property of the coating agent or welding workability.
  • the low hydrogen-based coated arc welding rod according to the present invention is a low-hydrogen-based coated arc welding rod in which a steel core wire is coated with a coating agent, and the coating agent is a metal carbonate (CO 2 equivalent): 8 to 25 %
  • metal fluoride (F conversion) 2 to 15% by mass
  • at least one of TiO 2 , ZrO 2 and Al 2 O 3 2 to 10% by mass in total
  • SiO 2 3 to 12% by mass
  • Mn 1 to 8 mass%
  • at least one of Na compound (Na conversion) and K compound (K conversion) 1.0 to 3.5% by mass in total, with the balance being Fe and inevitable impurities, Li compound content (Li conversion value) [Li], Na compound content (Na conversion value) [Na], when the K compound content (K converted value) is [K],
  • a composition satisfying the coverage of the coating is 22 to 45 mass%.
  • the coating agent may be regulated to C: 0.1% by mass or less.
  • the coating agent may contain Ti: 0.2 to 2.0% by mass.
  • the coating agent may contain B compound (B conversion): 0.02 to 0.3% by mass.
  • the coating agent may contain Ni: 0.5 to 10% by mass.
  • the coating agent may contain at least one of Cr and Mo: 0.1 to 3% by mass in total.
  • the coating agent may contain at least one of Al and Mg: 0.2 to 2% by mass in total.
  • the steel core wire can be formed of, for example, mild steel or low alloy steel.
  • the low hydrogen-based coated arc welding rod according to the embodiment of the present invention has a metal carbonate (CO 2 equivalent): 8 to 25% by mass, a metal fluoride (F equivalent): 2 to 15% by mass, TiO 2 , ZrO 2 And at least one of Al 2 O 3 : 2 to 10 mass% in total, SiO 2 : 3 to 12 mass%, Si: 1 to 7 mass%, Mn: 1 to 8 mass%, Li compound (Li conversion) : 0.03 to 0.7% by mass, at least one of Na compound (Na conversion) and K compound (K conversion): 1.0 to 3.5% by mass in total, the balance being Fe and inevitable
  • the steel core wire is coated with a coating material composed of impurities and satisfying the following mathematical formula 2.
  • the coating rate of the coating material is 22 to 45% by mass.
  • Equation 2 [Li] is the Li compound content (Li conversion value), [Na] is the Na compound content (Na conversion value), and [K] is the K compound content (K conversion value). .
  • the coating rate (%) of the coating agent of the coated arc welding rod is calculated by (mass of coating agent / total mass of welding rod) ⁇ 100.
  • the coating rate of the coating agent is less than 22% by mass, the shield is insufficient, the N content and the hydrogen content in the weld metal increase, and the toughness and crack resistance of the weld metal decrease.
  • the coating rate of the coating agent exceeds 45% by mass, the arc length becomes long and arc breakage occurs. Therefore, the coating rate of the coating agent is 22 to 45% by mass.
  • Metal carbonate has the effect of reducing the amount of N and hydrogen in the weld metal.
  • the amount of metal carbonate in the coating is less than 8% by mass in terms of CO 2 , the amount of hydrogen in the weld metal exceeds 4 ml / 100 g and the amount of N becomes excessive, resulting in good crack resistance. It is not possible to obtain properties and toughness.
  • the amount of metal carbonate in the coating exceeds 25% by mass in terms of CO 2 , the viscosity of the slag becomes excessive and vertical welding becomes difficult. Therefore, the metal carbonate content (CO 2 equivalent value) is 8 to 25% by mass with respect to the total mass of the coating agent.
  • the amount of metal carbonate in the coating is preferably 11% by mass or more, more preferably 16% by mass or more in terms of CO 2 from the viewpoint of reducing the amount of hydrogen and the amount of N in the weld metal.
  • the amount of metal carbonate is preferably 22% by mass or less in terms of CO 2 .
  • specific examples of the metal carbonate to be blended in the coatings and the like CaCO 3, MgCO 3 and BaCO 3.
  • the metal fluoride has an effect of adjusting the viscosity of the slag to improve the welding workability.
  • the amount of metal fluoride in the coating is less than 2% by mass in terms of F, the viscosity of the slag becomes too high and the bead shape deteriorates.
  • the amount of metal fluoride in the coating exceeds 15% by mass in terms of F, the arc becomes unstable. Therefore, the metal fluoride content (F converted value) is 2 to 15% by mass with respect to the total mass of the coating agent.
  • the amount of metal fluoride in the coating is preferably 4% by mass or more from the viewpoint of improving the bead shape, and preferably 10% by mass or less from the viewpoint of stabilizing the arc.
  • the metal fluoride to be incorporated in coatings such as CaF 2, BaF 2, AlF 3 and LiF and the like.
  • TiO 2 , ZrO 2 , Al 2 O 3 2 to 10% by mass in total
  • TiO 2 , ZrO 2 and Al 2 O 3 act as a slag fouling agent.
  • the total content of TiO 2 , ZrO 2 and Al 2 O 3 is less than 2% by mass with respect to the total weight of the coating agent, the viscosity of the slag decreases and the bead shape deteriorates. Therefore, for the TiO 2, ZrO 2 and Al 2 O 3, formulated to be at least one, a total of 2 mass% or more.
  • the total content of TiO 2 , ZrO 2 and Al 2 O 3 is 10% by mass or less per the total mass of the coating agent.
  • the total content of TiO 2 , ZrO 2 and Al 2 O 3 in the coating is preferably 3% by mass or more from the viewpoint of the bead shape, and 8% by mass or less from the viewpoint of slag removability. preferable.
  • TiO 2, ZrO 2 and Al 2 O 3 is not necessary to blend all, by incorporating at least one in the coating agent, effects are obtained as described above.
  • SiO 2 acts as a binder and a slag-faux agent.
  • the amount of SiO 2 in the coating exceeds 12% by mass with respect to the total mass of the coating, the slag becomes glassy and the slag releasability deteriorates.
  • the SiO 2 content is 3 to 12% by mass with respect to the total mass of the coating agent.
  • the amount of SiO 2 in the coating is preferably 4% by mass or more from the viewpoint of improving the binder effect, and is preferably 9% by mass or less from the viewpoint of slag removability.
  • MgO, CaO, etc. can be added for the purpose of viscosity adjustment other than the acidic oxide mentioned above.
  • potassium silicate, sodium silicate, etc. can be used as a binder.
  • the silicate containing crystal water, for example, mica, talc, sericite, etc. is not substantially contained in order to increase the amount of hydrogen in the weld metal.
  • Si acts as an oxygen scavenger and can be added in the form of alloy components such as Fe-Si and Fe-Si-Mn.
  • the Si content is less than 1% by mass with respect to the total mass of the coating agent, the effect as an oxygen scavenger becomes insufficient, and when it exceeds 7% by mass, the viscosity of the molten metal becomes high, and the base material The workability of welding deteriorates, for example, the familiarity with the machine decreases. Therefore, the Si content is 1 to 7% by mass with respect to the total mass of the coating agent.
  • Si content herein does not include Si contained in the SiO 2 described above.
  • Mn is an element that acts as a deoxidizer and is effective in improving the toughness of the weld metal.
  • Mn can be added to the coating in the form of metal Mn, Fe—Mn, or the like.
  • Mn content is less than 1% by mass with respect to the total mass of the coating agent, deoxidation is insufficient and blowholes are generated.
  • Mn content exceeds 8% by mass with respect to the total mass of the coating material, the viscosity of the molten metal is lowered to have a convex bead tendency, and the welding workability is deteriorated.
  • the Mn content is 1 to 8% by mass with respect to the total mass of the coating agent.
  • the amount of Mn in the coating is preferably 2% by mass or more in consideration of the toughness of the weld metal, and is preferably 5% by mass or less from the viewpoint of improving welding workability.
  • Li has an effect of improving the moisture absorption resistance of the coating agent, and is generally added to water glass.
  • the Li compound in the coating agent is less than 0.03% by mass in terms of Li, the effect of improving the hygroscopic resistance cannot be obtained.
  • the Li compound in the coating agent exceeds 0.7% by mass in terms of Li, the moisture absorption resistance is improved, but the viscosity of the water glass is reduced, and the performance as a lubricant in the coating step of the coating agent is improved. The covering operation becomes difficult.
  • the amount of Li compound exceeds 0.7% by mass, the fixing strength is lowered, and thus the coating agent is easily dropped after coating and dry cracking is likely to occur during drying.
  • the Li compound content is set to 0.03 to 0.7% by mass with respect to the total mass of the coating agent in terms of Li.
  • the Li compounds in addition to Li 2 O is added to the water glass, or the like can be used LiCO 3 and LiF.
  • Na and K have the effect of ensuring the adhesion of the coating material and the arc stability.
  • the arc becomes unstable and the fixing strength is increased. Since it falls, it will become easy to produce the dry cracking at the time of the fall of the coating agent after coating, and drying.
  • the total of the Na compound (Na converted value) and the K compound (K converted value) in the coating exceeds 3.5% by mass with respect to the total mass of the coating, the moisture absorption resistance of the coating deteriorates.
  • the total of the Na compound content (Na converted value) and the K compound content (K converted value) in the coating is in the range of 1.0 to 3.5% by mass.
  • Li compound content Li conversion value
  • Na compound content Na conversion value
  • K conversion value K conversion value
  • the composition satisfies Formula 2 above.
  • Li, Na and K have conflicting effects with respect to the influence of the coating on the fixing strength and moisture absorption resistance. That is, Li has the effect of improving the moisture absorption resistance while reducing the fixing strength of the coating agent.
  • Na and K have the effect of increasing the fixing strength, but decrease the moisture absorption resistance.
  • the adhesion strength of these alkaline components and the degree of influence on moisture absorption have a correlation with the atomic radius of each element.
  • the present inventor expressed the atomic radius of Na as 1.22, the atomic radius of K as 1.49, and arranged Na and K as the numerator and Li as the denominator. It has been found that the fixing strength and moisture absorption resistance of the coating can be evaluated simultaneously with the parameter of (1.22 ⁇ [Na] + 1.49 ⁇ [K]) / [Li].
  • Ti 0.2 to 2.0% by mass
  • Ti is a deoxidizing element and an element effective for improving the strength of the weld metal.
  • Ti also has the effect of producing a fine spherical oxide and refining the structure of the weld metal.
  • the content of Ti is less than 0.2% by mass with respect to the total mass of the coating agent, a sufficient deoxidizing effect and a weld metal strength improving effect cannot be obtained.
  • the Ti content exceeds 2.0 mass%, the amount of Ti in the weld metal increases excessively, the strength and hardness become excessively high, and the toughness of the weld metal decreases. Therefore, when Ti is added, its content is 0.2 to 2.0 mass% per the total mass of the coating agent.
  • Ti can be added in the form of Fe—Ti, metal Ti, or the like.
  • B is an element effective in suppressing the formation of grain boundary ferrite and having a strong hardenability.
  • B content in the coating material is less than 0.02% by mass in terms of B, the effect of suppressing the formation of grain boundary ferrite by B cannot be obtained, and the metal structure of the weld metal becomes rough.
  • the content of B in the coating exceeds 0.3% by mass, the weld metal exhibits a coarse lath structure and the toughness deteriorates. Therefore, when B is added, its content (B converted value) is set to 0.02 to 0.3% by mass with respect to the total mass of the coating agent. Note that Fe-B, Fe-Si-B, metal B, and the like can be added.
  • Ni has the effect of increasing the strength and toughness of the weld metal.
  • Ni when the use temperature of the welded member is lower than ⁇ 40 ° C., Ni is added to achieve both the strength and toughness of the weld metal. Is desirable.
  • the Ni content is less than 0.5% by mass with respect to the total mass of the coating agent, the effect of improving the toughness of the weld metal cannot be obtained.
  • the Ni content exceeds 10% by mass with respect to the total mass of the coating agent, the strength of the weld metal becomes too high and the toughness is lowered, and hot cracking is likely to occur during welding. Therefore, when Ni is added, the content is 0.5 to 10% by mass with respect to the total mass of the coating agent.
  • Ni can be added in the form of metal Ni, Ni—Mg, Fe—Ni, or the like.
  • Cr and Mo have the effect of improving the strength of the weld metal.
  • the total content of Cr and Mo is less than 0.1% by mass with respect to the total mass of the coating material, the effect of improving the strength of the weld metal cannot be obtained.
  • the total content of Cr and Mo exceeds 3% by mass with respect to the total mass of the coating material, the hardenability becomes excessive and carbides are generated, so that the toughness of the weld metal deteriorates. Therefore, when Cr and Mo are added, the total amount is in the range of 0.1 to 3% by mass with respect to the total mass of the coating agent. It is not necessary to add both Cr and Mo, and only one of them may be added.
  • Al and Mg are strong deoxidizers and have the effect of reducing the amount of oxygen in the weld metal and improving toughness.
  • the total content of Al and Mg is less than 0.2% by mass with respect to the total mass of the coating material, the effect of improving the toughness of the weld metal cannot be obtained.
  • the total content of Al and Mg exceeds 2% by mass with respect to the total mass of the coating agent, the arc becomes unstable, the amount of spatter generated increases, the viscosity of the slag decreases, and the slag peelability decreases. to degrade. Therefore, when Al and Mg are added, the total content thereof is 0.2 to 2% by mass with respect to the total mass of the coating agent. Note that it is not necessary to add both of Al and Mg, and only one of them may be added.
  • Step core wire Examples of the steel material used for the steel core wire include mild steel and low alloy steel.
  • the coating composition in particular, the relationship between the Li compound content and the Na compound content and the K compound content is specified.
  • the moisture absorption resistance can be improved without deteriorating the adhesiveness and welding workability of the agent.
  • a weld metal having a diffusible hydrogen content of 4 ml / 100 g or less can be obtained by using the low hydrogen-based coated arc welding rod of this embodiment.
  • a first aspect a low hydrogen-based arc welding rod in which a steel core wire is coated with a coating agent,
  • the coating agent is Metal carbonate (CO 2 equivalent): 8-25% by mass, Metal fluoride (F conversion): 2 to 15% by mass, At least one of TiO 2 , ZrO 2 and Al 2 O 3 : 2 to 10% by mass in total, SiO 2 : 3 to 12% by mass, Si: 1-7% by mass, Mn: 1 to 8% by mass, Li compound (Li conversion): 0.03 to 0.7% by mass, At least one of Na compound (Na conversion) and K compound (K conversion): 1.0 to 3.5% by mass in total And the balance consists of Fe and inevitable impurities,
  • the Li compound content (Li conversion value) is [Li]
  • the Na compound content (Na conversion value) is [Na]
  • the K compound content (K conversion value) is [K]
  • the said coating agent is a low hydrogen type
  • Third aspect The low hydrogen-based coated arc welding rod according to the first aspect or the second aspect, wherein the coating agent further contains Ti: 0.2 to 2.0% by mass.
  • Fourth aspect The low hydrogen-based coated arc welding rod according to any one of the first to third aspects, wherein the coating agent further contains a B compound (converted to B): 0.02 to 0.3 mass%.
  • Fifth aspect The low hydrogen-based coated arc welding rod according to any one of the first to fourth aspects, wherein the coating agent further contains Ni: 0.5 to 10% by mass.
  • the coating agent further includes at least one of Cr and Mo: the total content of 0.1 to 3% by mass.
  • the moisture absorption resistance was as follows.
  • the coated arc welding rod re-dried by heating for 1 hour under a temperature condition of 350 ° C. was exposed to an atmosphere of 30 ° C. and 80% relative humidity for 6 hours, and the coating agent absorbed moisture.
  • the water content was evaluated by measuring by the Karl Fischer method (vaporization method). At the time of measurement, heating was performed at 750 ° C. in order to vaporize moisture from the coating material, and the dry air was guided to the measuring device as a carrier gas. As a result, it was judged that the water content in the coating material was 3000 ppm by mass or less.
  • each welding rod was heated at 350 ° C. for 1 hour before welding.
  • Mechanical performance was evaluated by the tensile strength of weld metal (TS (Tensile Strength)) and the absorbed energy (vE-20 ° C) of the Charpy impact test at -20 ° C. What was there was judged to be good.
  • the welding workability was evaluated in four stages of ⁇ , ⁇ , ⁇ , and ⁇ depending on the sensory, and ⁇ and ⁇ were judged to be good.
  • ⁇ Adhesiveness of coating agent The fixing property of the coating material is first observed after firing by visual observation of the presence or absence of cracks on the surface of the coating material, and then the stability of the protective cylinder during welding is classified into four stages according to sensation: ⁇ , ⁇ , ⁇ and ⁇ . evaluated. As a result, ⁇ and ⁇ were judged as good.
  • ⁇ Diffusion hydrogen amount> In a downward welding posture, the polarity was AC or DCEP (direct current rod plus), welding was performed in one pass under conditions of a welding current of 150 to 160 A, a welding voltage of 22 V, and a welding speed of 180 mm / min. At that time, the welding atmosphere was a temperature of 20 ° C. and a relative humidity of 10%. Moreover, in order to re-dry the coating material, each welding rod was heated under a temperature condition of 350 ° C. for 1 hour before welding.
  • the amount of diffusible hydrogen in the weld metal obtained by welding was measured by a method based on JIS Z 3118: 2007. As a result, it was judged that the diffusible hydrogen content was 4.0 ml / 100 g or less.
  • Table 4 The above evaluation results are summarized in Table 4 below.
  • the welding rod No. 31 is inferior in hygroscopic resistance because (1.22 ⁇ [Na] + 1.49 ⁇ [K]) / [Li] exceeds the range of the present invention in the component composition of the coating agent. The amount of diffused hydrogen was also large. On the other hand, no. In the welding rod of 32, in the component composition of the coating, (1.22 ⁇ [Na] + 1.49 ⁇ [K]) / [Li] is less than the range of the present invention, so that the fixing strength of the coating is low. Furthermore, since the total content of Na compound and K compound is less than the range of the present invention, the arc becomes unstable.
  • the 42 welding rod was inferior in moisture absorption resistance because the total of Na compound content and K compound content in the coating exceeded the range of the present invention.
  • the metal fluoride content was less than the range of the present invention in the component composition of the coating, so the viscosity of the slag increased and the bead shape deteriorated.
  • the welding rod of No. 44 since the Li compound content exceeded the range of the present invention in the component composition of the coating material, the fixing strength of the coating material decreased.
  • the welding rod of No. 45 had good moisture absorption resistance, adhesion of the coating material and welding workability. However, Ti was added to the coating material in an amount exceeding 2.0 mass% and exceeding 0.3 mass%. Since the B compound was added, the toughness of the weld metal was lowered. Similarly, no. The 46 welding rod also had good moisture absorption characteristics, coating adhesiveness and welding workability, but the Ni added to the coating exceeded 10% by mass, so the weld metal toughness decreased. .
  • the 47 welding rod also had good moisture absorption characteristics, adhesion of the coating and welding workability. However, since Cr and Mo were added to the coating exceeding 3% by mass, the toughness of the weld metal was high. Declined. On the other hand, no. In the 48 welding rod, since Al and Mg were added in an amount exceeding 2% by mass to the coating agent, the arc became unstable and the slag peelability was also lowered.
  • the welding rods 1 to 30 were excellent in moisture absorption resistance, and had good coating adhesion and welding workability. In addition, no. Since the welding rods 1 to 28, 30 contain a specific amount of one or more elements of Ti, B compound, Ni, Cr, Mo, Al and Mg, the content of these elements is Less No. Compared to 29 welding rods, the mechanical properties of the weld metal were superior.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The purpose of the present invention is to provide a low-hydrogen type coated arc welding electrode by which it is possible to improve moisture absorption resistance without causing a reduction in fixability of a coating agent or welding operability. Provided is a low-hydrogen type coated arc welding electrode, in which a steel core wire is coated with a coating agent, wherein the coating agent contains 8-25 mass % of a metal carbonate (in terms of CO2), 2-15 mass % of a metal fluoride (in terms of F), a total of 2-10 mass % of at least one compound selected from among TiO2, ZrO2 and Al2O3, 3-12 mass % of SiO2, 1-7 mass % of Si, 1-8 mass % of Mn, 0.03-0.7 mass % of a Li compound (in terms of Li) and a total of 1.0-3.5 mass % of at least one compound selected from among a Na compound (in terms of Na) and a K compound (in terms of K), with the remainder consisting of Fe and unavoidable impurities; the composition satisfies numerical formula (1); and the coating rate is 22-45 mass %.

Description

低水素系被覆アーク溶接棒Low hydrogen coated arc welding rod
　本発明は、鋼心線を低水素系被覆剤で被覆した低水素系被覆アーク溶接棒に関する。より詳しくは、低水素系被覆アーク溶接棒の耐吸湿特性を向上させる技術に関する。 The present invention relates to a low hydrogen-based coated arc welding rod in which a steel core wire is coated with a low hydrogen-based coating agent. More specifically, the present invention relates to a technique for improving the moisture absorption resistance of a low hydrogen-based coated arc welding rod.
　従来、被覆アーク溶接棒の耐吸湿特性を向上させるため、種々の検討がなされている（特許文献１～４参照）。例えば、特許文献１には、被覆剤にガラス粉末を配合した被覆アーク溶接棒が提案されている。また、特許文献２～４には、被覆剤の固着剤にアルカリ金属の珪酸塩水溶液を用いた被覆アーク溶接棒が提案されている。 Conventionally, various studies have been made to improve the moisture absorption resistance of the coated arc welding rod (see Patent Documents 1 to 4). For example, Patent Document 1 proposes a coated arc welding rod in which glass powder is blended with a coating agent. Patent Documents 2 to 4 propose a coated arc welding rod using an alkali metal silicate aqueous solution as a coating agent fixing agent.
特公昭４８－３４２９５号公報Japanese Patent Publication No. 48-34295 特開昭４８－６５１３３号公報JP-A-48-65133 特開昭５０－１４５５６号公報JP 50-14556 A 特開昭５９－３８８７８号公報JP 59-38887
　しかしながら、前述した従来の技術を低水素系被覆剤に適用すると、被覆剤の固着性や溶接作業性が低下するという問題点がある。特に、得られる溶接金属中の拡散性水素量が４ｍｌ／１００ｇ以下である超低水素系被覆アーク溶接棒において、耐吸湿特性に優れ、かつ被覆剤の固着性及び溶接作業性が良好なものが求められている。 However, when the above-described conventional technique is applied to a low hydrogen-based coating, there is a problem that the adhesion of the coating and the welding workability are lowered. In particular, in the ultra-low hydrogen-based coated arc welding rod in which the amount of diffusible hydrogen in the obtained weld metal is 4 ml / 100 g or less, it has excellent moisture absorption resistance, and has good adhesion of the coating and welding workability. It has been demanded.
　そこで、本発明は、被覆剤の固着性や溶接作業性を低下させずに、耐吸湿性を向上させることができる低水素系被覆アーク溶接棒を提供することを主目的とする。 Therefore, the main object of the present invention is to provide a low hydrogen-based arc welding rod capable of improving the moisture absorption resistance without deteriorating the fixing property of the coating agent or welding workability.
　本発明に係る低水素系被覆アーク溶接棒は、鋼心線を被覆剤で被覆した低水素系被覆アーク溶接棒であって、前記被覆剤は、金属炭酸塩（ＣＯ２換算）：８～２５質量％、金属フッ化物（Ｆ換算）：２～１５質量％、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３のうち少なくとも１種：合計で２～１０質量％、ＳｉＯ２：３～１２質量％、Ｓｉ：１～７質量％、Ｍｎ：１～８質量％、Ｌｉ化合物（Ｌｉ換算）：０．０３～０．７質量％、Ｎａ化合物（Ｎａ換算）及びＫ化合物（Ｋ換算）のうち少なくとも一方：合計で１．０～３．５質量％を含有し、残部がＦｅ及び不可避的不純物からなり、Ｌｉ化合物含有量（Ｌｉ換算値）を［Ｌｉ］、Ｎａ化合物含有量（Ｎａ換算値）を［Ｎａ］、Ｋ化合物含有量（Ｋ換算値）を[Ｋ]としたとき、下記数式１を満たす組成であり、前記被覆剤の被覆率が２２～４５質量％である。なお、ここでいう被覆率は、（被覆剤の質量／溶接棒全質量）×１００により算出される値である。 The low hydrogen-based coated arc welding rod according to the present invention is a low-hydrogen-based coated arc welding rod in which a steel core wire is coated with a coating agent, and the coating agent is a metal carbonate (CO 2 equivalent): 8 to 25 % By mass, metal fluoride (F conversion): 2 to 15% by mass, at least one of TiO 2 , ZrO 2 and Al 2 O 3 : 2 to 10% by mass in total, SiO 2 : 3 to 12% by mass, Si: 1 to 7 mass%, Mn: 1 to 8 mass%, Li compound (Li conversion): 0.03 to 0.7 mass%, at least one of Na compound (Na conversion) and K compound (K conversion) : 1.0 to 3.5% by mass in total, with the balance being Fe and inevitable impurities, Li compound content (Li conversion value) [Li], Na compound content (Na conversion value) [Na], when the K compound content (K converted value) is [K], A composition satisfying the coverage of the coating is 22 to 45 mass%. The coverage here is a value calculated by (mass of coating agent / total mass of welding rod) × 100.
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　前記被覆剤は、Ｃ：０．１質量％以下に規制してもよい。
　前記被覆剤は、Ｔｉ：０．２～２．０質量％を含有していてもよい。
　前記被覆剤は、Ｂ化合物（Ｂ換算）：０．０２～０．３質量％を含有していてもよい。
　前記被覆剤は、Ｎｉ：０．５～１０質量％を含有していてもよい。
　前記被覆剤は、Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％を含有することもできる。
　前記被覆剤は、Ａｌ及びＭｇのうち少なくとも一方：合計で０．２～２質量％を含有することもできる。
　一方、前記鋼心線は、例えば軟鋼又は低合金鋼により形成することができる。 The coating agent may be regulated to C: 0.1% by mass or less.
The coating agent may contain Ti: 0.2 to 2.0% by mass.
The coating agent may contain B compound (B conversion): 0.02 to 0.3% by mass.
The coating agent may contain Ni: 0.5 to 10% by mass.
The coating agent may contain at least one of Cr and Mo: 0.1 to 3% by mass in total.
The coating agent may contain at least one of Al and Mg: 0.2 to 2% by mass in total.
On the other hand, the steel core wire can be formed of, for example, mild steel or low alloy steel.
　本発明によれば、耐吸湿特性に優れ、被覆剤の固着性及び溶接作業性も良好な低水素系被覆アーク溶接棒を実現することができる。 According to the present invention, it is possible to realize a low hydrogen-based coated arc welding rod that is excellent in moisture absorption resistance, and has good coating adhesion and welding workability.
　以下、本発明を実施するための形態について、詳細に説明する。なお、本発明は、以下に説明する実施形態に限定されるものではない。 Hereinafter, embodiments for carrying out the present invention will be described in detail. Note that the present invention is not limited to the embodiments described below.
　本発明の実施形態に係る低水素系被覆アーク溶接棒は、金属炭酸塩（ＣＯ２換算）：８～２５質量％、金属フッ化物（Ｆ換算）：２～１５質量％、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３のうち少なくとも１種：合計で２～１０質量％、ＳｉＯ２：３～１２質量％、Ｓｉ：１～７質量％、Ｍｎ：１～８質量％、Ｌｉ化合物（Ｌｉ換算）：０．０３～０．７質量％、Ｎａ化合物（Ｎａ換算）及びＫ化合物（Ｋ換算）のうち少なくとも一方：合計で１．０～３．５質量％を含有し、残部がＦｅ及び不可避的不純物からなり、かつ下記数式２を満たす組成の被覆剤で、鋼心線を被覆したものであり、被覆剤の被覆率は２２～４５質量％である。 The low hydrogen-based coated arc welding rod according to the embodiment of the present invention has a metal carbonate (CO 2 equivalent): 8 to 25% by mass, a metal fluoride (F equivalent): 2 to 15% by mass, TiO 2 , ZrO 2 And at least one of Al 2 O 3 : 2 to 10 mass% in total, SiO 2 : 3 to 12 mass%, Si: 1 to 7 mass%, Mn: 1 to 8 mass%, Li compound (Li conversion) : 0.03 to 0.7% by mass, at least one of Na compound (Na conversion) and K compound (K conversion): 1.0 to 3.5% by mass in total, the balance being Fe and inevitable The steel core wire is coated with a coating material composed of impurities and satisfying the following mathematical formula 2. The coating rate of the coating material is 22 to 45% by mass.
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　なお、上記数式２において、［Ｌｉ］はＬｉ化合物含有量（Ｌｉ換算値）、［Ｎａ］はＮａ化合物含有量（Ｎａ換算値）、［Ｋ］はＫ化合物含有量（Ｋ換算値）である。 In Equation 2, [Li] is the Li compound content (Li conversion value), [Na] is the Na compound content (Na conversion value), and [K] is the K compound content (K conversion value). .
（被覆剤）
［溶接棒全質量に対する被覆剤の被覆率：２２～４５質量％］
　被覆アーク溶接棒の被覆剤の被覆率（％）は、（被覆剤の質量／溶接棒全質量）×１００により算出される。被覆剤の被覆率が２２質量％未満の場合、シールド不足となり、溶接金属中のＮ含有量及び水素量が増加し、溶接金属の靱性及び耐割れ性が低下する。一方、被覆剤の被覆率が４５質量％を超えると、アーク長が長くなり、アーク切れが発生する。よって、被覆剤の被覆率は２２～４５質量％とする。 (Coating agent)
[Coating ratio of coating agent with respect to the total mass of the welding rod: 22 to 45 mass%]
The coating rate (%) of the coating agent of the coated arc welding rod is calculated by (mass of coating agent / total mass of welding rod) × 100. When the coating rate of the coating agent is less than 22% by mass, the shield is insufficient, the N content and the hydrogen content in the weld metal increase, and the toughness and crack resistance of the weld metal decrease. On the other hand, when the coating rate of the coating agent exceeds 45% by mass, the arc length becomes long and arc breakage occurs. Therefore, the coating rate of the coating agent is 22 to 45% by mass.
［金属炭酸塩（ＣＯ２換算）：８～２５質量％］
　金属炭酸塩は、溶接金属中のＮ及び水素量を低減させる効果がある。しかし、被覆剤中の金属炭酸塩量が、ＣＯ２換算値で、８質量％未満であると、溶接金属中の水素量が４ｍｌ／１００ｇを超えると共に、Ｎ量が過剰となり、良好な耐割れ性及び靱性を得ることができない。一方、被覆剤中の金属炭酸塩量が、ＣＯ２換算値で、２５質量％を超えると、スラグの粘性が過度となり、立向溶接が困難になる。よって、金属炭酸塩含有量（ＣＯ２換算値）は、被覆剤全質量あたり、８～２５質量％とする。 [Metal carbonate (CO 2 equivalent): 8 to 25% by mass]
Metal carbonate has the effect of reducing the amount of N and hydrogen in the weld metal. However, if the amount of metal carbonate in the coating is less than 8% by mass in terms of CO 2 , the amount of hydrogen in the weld metal exceeds 4 ml / 100 g and the amount of N becomes excessive, resulting in good crack resistance. It is not possible to obtain properties and toughness. On the other hand, if the amount of metal carbonate in the coating exceeds 25% by mass in terms of CO 2 , the viscosity of the slag becomes excessive and vertical welding becomes difficult. Therefore, the metal carbonate content (CO 2 equivalent value) is 8 to 25% by mass with respect to the total mass of the coating agent.
　被覆剤における金属炭酸塩量は、溶接金属中の水素量及びＮ量低減の観点から、ＣＯ２換算値で１１質量％以上とすることが好ましく、より好ましくは１６質量％以上である。一方、スラグ粘度を下げ、溶接作業性を更に良好にするためには、金属炭酸塩量は、ＣＯ２換算値で２２質量％以下とすることが好ましい。なお、被覆剤に配合される金属炭酸塩の具体例としては、ＣａＣＯ３、ＭｇＣＯ３及びＢａＣＯ３などが挙げられる。 The amount of metal carbonate in the coating is preferably 11% by mass or more, more preferably 16% by mass or more in terms of CO 2 from the viewpoint of reducing the amount of hydrogen and the amount of N in the weld metal. On the other hand, in order to lower the slag viscosity and further improve the welding workability, the amount of metal carbonate is preferably 22% by mass or less in terms of CO 2 . As specific examples of the metal carbonate to be blended in the coatings, and the like CaCO 3, MgCO 3 and BaCO 3.
［金属フッ化物（Ｆ換算）：２～１５質量％］
　金属フッ化物は、スラグの粘性を調整して、溶接作業性を良好にする効果がある。しかし、被覆剤中の金属フッ化物量が、Ｆ換算値で、２質量％未満の場合、スラグの粘性が高くなりすぎてビード形状が劣化する。一方、被覆剤中の金属フッ化物量が、Ｆ換算値で、１５質量％を超えると、アークが不安定になる。よって、金属フッ化物含有量（Ｆ換算値）は、被覆剤全質量あたり、２～１５質量％とする。 [Metal fluoride (F conversion): 2 to 15% by mass]
The metal fluoride has an effect of adjusting the viscosity of the slag to improve the welding workability. However, when the amount of metal fluoride in the coating is less than 2% by mass in terms of F, the viscosity of the slag becomes too high and the bead shape deteriorates. On the other hand, when the amount of metal fluoride in the coating exceeds 15% by mass in terms of F, the arc becomes unstable. Therefore, the metal fluoride content (F converted value) is 2 to 15% by mass with respect to the total mass of the coating agent.
　被覆剤における金属フッ化物量は、ビード形状の向上の観点から４質量％以上とすることが好ましく、またアークの安定化の観点から１０質量％以下とすることが好ましい。なお、被覆剤に配合される金属フッ化物の具体例としては、ＣａＦ２、ＢａＦ２、ＡｌＦ３及びＬｉＦなどが挙げられる。 The amount of metal fluoride in the coating is preferably 4% by mass or more from the viewpoint of improving the bead shape, and preferably 10% by mass or less from the viewpoint of stabilizing the arc. As specific examples of the metal fluoride to be incorporated in coatings, such as CaF 2, BaF 2, AlF 3 and LiF and the like.
［ＴｉＯ２、ＺｒＯ２、Ａｌ２Ｏ３：合計で２～１０質量％］
　ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３は、スラグ造滓剤として作用する。しかし、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３の総含有量が、被覆剤全重量あたり２質量％未満の場合、スラグの粘性が低下してビード形状が劣化する。このため、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３については、少なくとも１種を、合計で２質量％以上となるように配合する。 [TiO 2 , ZrO 2 , Al 2 O 3 : 2 to 10% by mass in total]
TiO 2 , ZrO 2 and Al 2 O 3 act as a slag fouling agent. However, when the total content of TiO 2 , ZrO 2 and Al 2 O 3 is less than 2% by mass with respect to the total weight of the coating agent, the viscosity of the slag decreases and the bead shape deteriorates. Therefore, for the TiO 2, ZrO 2 and Al 2 O 3, formulated to be at least one, a total of 2 mass% or more.
　一方、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３を過剰添加すると、スラグがガラス状になり、スラグ剥離性が劣化する。そこで、本実施形態の低水素系被覆アーク溶接棒では、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３の総含有量は、被覆剤全質量あたり、１０質量％以下とする。 On the other hand, if TiO 2 , ZrO 2 and Al 2 O 3 are added excessively, the slag becomes glassy and the slag peelability deteriorates. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, the total content of TiO 2 , ZrO 2 and Al 2 O 3 is 10% by mass or less per the total mass of the coating agent.
　被覆剤におけるＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３の総含有量は、ビード形状の観点から３質量％以上とすることが好ましく、また、スラグ剥離性の観点から８質量％以下とすることが好ましい。なお、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３は、全てを配合する必要はなく、少なくとも１種を被覆剤に配合することにより、前述した効果が得られる。 The total content of TiO 2 , ZrO 2 and Al 2 O 3 in the coating is preferably 3% by mass or more from the viewpoint of the bead shape, and 8% by mass or less from the viewpoint of slag removability. preferable. In addition, TiO 2, ZrO 2 and Al 2 O 3 is not necessary to blend all, by incorporating at least one in the coating agent, effects are obtained as described above.
［ＳｉＯ２：３～１２質量％］
　ＳｉＯ２は、粘結剤及びスラグ造滓剤として作用する。しかし、被覆剤中のＳｉＯ２量が、被覆剤全質量あたり１２質量％を超えると、スラグがガラス状になって、スラグの剥離性が劣化する。一方、被覆剤中のＳｉＯ２量が、被覆剤全質量あたり３質量％未満の場合、粘結剤としての効果を得ることができない。よって、ＳｉＯ２含有量は、被覆剤全質量あたり、３～１２質量％とする。被覆剤におけるＳｉＯ２量は、粘結剤効果向上の観点から４質量％以上とすることが好ましく、また、スラグ剥離性の観点から９質量％以下とすることが好ましい。 [SiO 2 : 3 to 12% by mass]
SiO 2 acts as a binder and a slag-faux agent. However, if the amount of SiO 2 in the coating exceeds 12% by mass with respect to the total mass of the coating, the slag becomes glassy and the slag releasability deteriorates. On the other hand, when the amount of SiO 2 in the coating agent is less than 3% by mass with respect to the total mass of the coating agent, the effect as a binder cannot be obtained. Therefore, the SiO 2 content is 3 to 12% by mass with respect to the total mass of the coating agent. The amount of SiO 2 in the coating is preferably 4% by mass or more from the viewpoint of improving the binder effect, and is preferably 9% by mass or less from the viewpoint of slag removability.
　なお、被覆剤に配合されるスラグ造滓剤としては、前述した酸性酸化物の他に、粘性の調整を目的としてＭｇＯ及びＣａＯなどを添加することができる。また、粘結剤としては、ケイ酸カリウムやケイ酸ナトリウムなどを使用することができる。ただし、結晶水を含有するケイ酸塩、例えば、マイカ、タルク及びセリサイトなどは、溶接金属中の水素量を増加させるため、実質的には含有しないことが好ましい。 In addition, as a slag making agent mix | blended with a coating material, MgO, CaO, etc. can be added for the purpose of viscosity adjustment other than the acidic oxide mentioned above. Moreover, potassium silicate, sodium silicate, etc. can be used as a binder. However, it is preferable that the silicate containing crystal water, for example, mica, talc, sericite, etc., is not substantially contained in order to increase the amount of hydrogen in the weld metal.
［Ｓｉ：１～７質量％］
　Ｓｉは脱酸素剤として作用し、例えばＦｅ－Ｓｉ及びＦｅ－Ｓｉ－Ｍｎなどの合金成分の形態で添加することができる。ただし、Ｓｉ含有量が、被覆剤全質量あたり、１質量％未満の場合、脱酸素剤としての効果が不十分となり、また、７質量％を超えると、溶融金属の粘性が高くなり、母材へのなじみが低下するなど溶接作業性が劣化する。よって、Ｓｉ含有量は、被覆剤全質量あたり、１～７質量％とする。なお、ここでいうＳｉ含有量は、前述したＳｉＯ２に含まれるＳｉを含まない。 [Si: 1-7% by mass]
Si acts as an oxygen scavenger and can be added in the form of alloy components such as Fe-Si and Fe-Si-Mn. However, when the Si content is less than 1% by mass with respect to the total mass of the coating agent, the effect as an oxygen scavenger becomes insufficient, and when it exceeds 7% by mass, the viscosity of the molten metal becomes high, and the base material The workability of welding deteriorates, for example, the familiarity with the machine decreases. Therefore, the Si content is 1 to 7% by mass with respect to the total mass of the coating agent. Incidentally, Si content herein does not include Si contained in the SiO 2 described above.
［Ｍｎ：１～８質量％］
　Ｍｎは、前述したＳｉと同様に、脱酸剤として作用する他、溶接金属の靭性向上にも有効な元素である。そして、Ｍｎは、金属ＭｎやＦｅ－Ｍｎなどの形態で被覆剤に添加することができる。ただし、Ｍｎ含有量が、被覆剤全質量あたり１質量％未満の場合、脱酸不足となり、ブローホールが発生する。一方、Ｍｎ含有量が、被覆剤全質量あたり８質量％を超えると、溶融金属の粘性が低下して凸ビード傾向となり、溶接作業性が劣化する。よって、Ｍｎ含有量は、被覆剤全質量あたり、１～８質量％とする。被覆剤におけるＭｎ量は、溶接金属の靭性を考慮すると２質量％以上とすることが好ましく、溶接作業性向上の観点から５質量％以下とすることが好ましい。 [Mn: 1-8% by mass]
Similar to Si described above, Mn is an element that acts as a deoxidizer and is effective in improving the toughness of the weld metal. Mn can be added to the coating in the form of metal Mn, Fe—Mn, or the like. However, when the Mn content is less than 1% by mass with respect to the total mass of the coating agent, deoxidation is insufficient and blowholes are generated. On the other hand, when the Mn content exceeds 8% by mass with respect to the total mass of the coating material, the viscosity of the molten metal is lowered to have a convex bead tendency, and the welding workability is deteriorated. Therefore, the Mn content is 1 to 8% by mass with respect to the total mass of the coating agent. The amount of Mn in the coating is preferably 2% by mass or more in consideration of the toughness of the weld metal, and is preferably 5% by mass or less from the viewpoint of improving welding workability.
［Ｌｉ化合物（Ｌｉ換算値）：０．０３～０．７質量％］
　Ｌｉは、被覆剤の耐吸湿性を向上させる効果があり、一般には水ガラス中に添加される。被覆剤中のＬｉ化合物が、Ｌｉ換算値で０．０３質量％未満の場合、耐吸湿性を向上させる効果が得られない。一方、被覆剤中のＬｉ化合物が、Ｌｉ換算値で０．７質量％を超えると、耐吸湿性は向上するが、水ガラスの粘性が小さくなり被覆剤の被覆工程における潤滑剤としての性能が低下して、被覆作業が困難になる。また、Ｌｉ化合物量が０．７質量％を超えると、固着強度が低下するため、被覆後における被覆剤の脱落及び乾燥時における乾燥割れが生じやすくなる。 [Li compound (Li conversion value): 0.03 to 0.7 mass%]
Li has an effect of improving the moisture absorption resistance of the coating agent, and is generally added to water glass. When the Li compound in the coating agent is less than 0.03% by mass in terms of Li, the effect of improving the hygroscopic resistance cannot be obtained. On the other hand, when the Li compound in the coating agent exceeds 0.7% by mass in terms of Li, the moisture absorption resistance is improved, but the viscosity of the water glass is reduced, and the performance as a lubricant in the coating step of the coating agent is improved. The covering operation becomes difficult. On the other hand, when the amount of Li compound exceeds 0.7% by mass, the fixing strength is lowered, and thus the coating agent is easily dropped after coating and dry cracking is likely to occur during drying.
　よって、Ｌｉ化合物含有量は、Ｌｉ換算値で、被覆剤全質量あたり０．０３～０．７質量％とする。なお、Ｌｉ化合物の具体例としては、水ガラスに添加されるＬｉ２Ｏの他に、ＬｉＣＯ３及びＬｉＦなどを用いることができる。 Therefore, the Li compound content is set to 0.03 to 0.7% by mass with respect to the total mass of the coating agent in terms of Li. As specific examples of the Li compounds, in addition to Li 2 O is added to the water glass, or the like can be used LiCO 3 and LiF.
［Ｎａ化合物（Ｎａ換算値）、Ｋ化合物（Ｋ換算値）：合計で１．０～３．５質量％］
　Ｎａ及びＫは、被覆剤の固着性及びアーク安定性を確保する効果がある。しかし、被覆剤中のＮａ化合物（Ｎａ換算値）とＫ化合物（Ｋ換算値）の合計が、被覆剤全質量あたり１．０質量％未満であると、アークが不安定になると共に固着強度が低下するため、被覆後における被覆剤の脱落及び乾燥時における乾燥割れが生じやすくなる。一方、被覆剤中のＮａ化合物（Ｎａ換算値）とＫ化合物（Ｋ換算値）の合計が、被覆剤全質量あたり３．５質量％を超えると、被覆剤の耐吸湿性が劣化する。 [Na compound (Na converted value), K compound (K converted value): 1.0 to 3.5 mass% in total]
Na and K have the effect of ensuring the adhesion of the coating material and the arc stability. However, if the total of Na compound (Na converted value) and K compound (K converted value) in the coating is less than 1.0% by mass with respect to the total mass of the coating, the arc becomes unstable and the fixing strength is increased. Since it falls, it will become easy to produce the dry cracking at the time of the fall of the coating agent after coating, and drying. On the other hand, when the total of the Na compound (Na converted value) and the K compound (K converted value) in the coating exceeds 3.5% by mass with respect to the total mass of the coating, the moisture absorption resistance of the coating deteriorates.
　よって、被覆剤中のＮａ化合物含有量（Ｎａ換算値）とＫ化合物含有量（Ｋ換算値）の合計は、１．０～３．５質量％の範囲とする。なお、Ｎａ化合物及びＫ化合物（Ｋ換算値）は、その両方を配合する必要はなく、少なくとも一方を被覆剤に配合すれば、前述した効果が得られる。 Therefore, the total of the Na compound content (Na converted value) and the K compound content (K converted value) in the coating is in the range of 1.0 to 3.5% by mass. In addition, it is not necessary to mix | blend both the Na compound and K compound (K conversion value), and the effect mentioned above will be acquired if at least one is mix | blended with a coating material.
［Ｌｉ化合物含有量とＮａ化合物含有量とＫ化合物含有量の関係］
　本実施形態の低水素系被覆アーク溶接棒では、被覆剤について、Ｌｉ化合物含有量（Ｌｉ換算値）とＮａ化合物含有量（Ｎａ換算値）とＫ化合物含有量（Ｋ換算値）との関係が、上記数式２を満たす組成にしている。Ｌｉと、Ｎａ及びＫとは、被覆剤の固着強度と耐吸湿性に及ぼす影響に関して、相反する作用を有する。即ち、Ｌｉは、被覆剤の固着強度を低下させるが耐吸湿性を向上させる効果がある。これに対して、Ｎａ及びＫは、固着強度を上昇させる効果があるが、耐吸湿性を低下させる。 [Relationship between Li compound content, Na compound content and K compound content]
In the low hydrogen-based coated arc welding rod of the present embodiment, the relationship between the Li compound content (Li conversion value), the Na compound content (Na conversion value), and the K compound content (K conversion value) is about the coating agent. The composition satisfies Formula 2 above. Li, Na and K have conflicting effects with respect to the influence of the coating on the fixing strength and moisture absorption resistance. That is, Li has the effect of improving the moisture absorption resistance while reducing the fixing strength of the coating agent. On the other hand, Na and K have the effect of increasing the fixing strength, but decrease the moisture absorption resistance.
　そこで、本実施形態の低水素系被覆アーク溶接棒では、これらアルカリ成分の被覆剤の固着強度と耐吸湿性への影響度は、それぞれの元素の原子半径と相関があると考えた。そして、本発明者は、Ｌｉの原子半径を１とした場合、Ｎａの原子半径は１．２２、Ｋの原子半径は１．４９と表され、ＮａとＫを分子、Ｌｉを分母に配置した（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]なるパラメータで被覆剤の固着強度と耐吸湿性を同時に評価できることを見出した。 Therefore, in the low hydrogen-based coated arc welding rod of this embodiment, it was considered that the adhesion strength of these alkaline components and the degree of influence on moisture absorption have a correlation with the atomic radius of each element. When the atomic radius of Li is 1, the present inventor expressed the atomic radius of Na as 1.22, the atomic radius of K as 1.49, and arranged Na and K as the numerator and Li as the denominator. It has been found that the fixing strength and moisture absorption resistance of the coating can be evaluated simultaneously with the parameter of (1.22 × [Na] + 1.49 × [K]) / [Li].
　ただし、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]が２．０未満の場合、耐吸湿性には優れるが、被覆剤の固着強度が低下する。また、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]が３５を超えると、被覆剤の固着強度は向上するが、耐吸湿性が低下する。よって、上記数式２に示すパラメータ（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]の範囲は、２～３５とする。なお、被覆剤の固着強度と耐吸湿性のバランスを考慮すると、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]の範囲は、５～２０であることが好ましい。 However, when (1.22 × [Na] + 1.49 × [K]) / [Li] is less than 2.0, the moisture absorption resistance is excellent, but the fixing strength of the coating agent decreases. On the other hand, if (1.22 × [Na] + 1.49 × [K]) / [Li] exceeds 35, the fixing strength of the coating is improved, but the moisture absorption resistance is lowered. Therefore, the range of the parameter (1.22 × [Na] + 1.49 × [K]) / [Li] shown in Equation 2 is 2 to 35. Note that the range of (1.22 × [Na] + 1.49 × [K]) / [Li] is preferably 5 to 20 in consideration of the balance between the fixing strength of the coating and the moisture absorption resistance.
［Ｃ：０．１質量％以下］
　Ｃ含有量が、被覆剤全質量あたり０．１質量％を超えると、溶接金属中のＣ量が過剰となり、高温割れが発生しやすくなると共に、靭性低下の原因となる高炭素マルテンサイトが生成しやすくなる。このため、Ｃ含有量は、被覆剤全質量あたり、０．１質量％以下に規制することが好ましい。 [C: 0.1% by mass or less]
When the C content exceeds 0.1% by mass with respect to the total mass of the coating agent, the amount of C in the weld metal becomes excessive, high temperature cracking is likely to occur, and high carbon martensite that causes toughness reduction is generated. It becomes easy to do. For this reason, it is preferable to regulate C content to 0.1 mass% or less per coating-material total mass.
　また、本実施形態の低水素系被覆アーク溶接棒では、被覆剤に、前述した各成分に加えて、以下に示す成分のうち１種又は２種以上を、必要に応じて添加することができる。 Moreover, in the low hydrogen type | system | group covering arc welding rod of this embodiment, in addition to each component mentioned above, 1 type, or 2 or more types of the components shown below can be added to a coating agent as needed. .
［Ｔｉ：０．２～２．０質量％］
　Ｔｉは、脱酸性元素であると共に、溶接金属の強度向上に有効な元素である。また、Ｔｉは微細な球状酸化物を生成して、溶接金属の組織の微細化する効果もある。ただし、Ｔｉの含有量が、被覆剤全質量あたり、０．２質量％未満の場合、十分な脱酸効果及び溶接金属の強度向上効果が得られない。一方、Ｔｉの含有量が２．０質量％を超えると、溶接金属中のＴｉ量が多くなり過ぎ、強度及び硬度が過度に高くなって、溶接金属の靭性が低下する。よって、Ｔｉを添加する場合は、その含有量を、被覆剤全質量あたり、０．２～２．０質量％とする。なお、Ｔｉは、Ｆｅ－Ｔｉ及び金属Ｔｉなどの形態で添加することができる。 [Ti: 0.2 to 2.0% by mass]
Ti is a deoxidizing element and an element effective for improving the strength of the weld metal. Ti also has the effect of producing a fine spherical oxide and refining the structure of the weld metal. However, when the content of Ti is less than 0.2% by mass with respect to the total mass of the coating agent, a sufficient deoxidizing effect and a weld metal strength improving effect cannot be obtained. On the other hand, if the Ti content exceeds 2.0 mass%, the amount of Ti in the weld metal increases excessively, the strength and hardness become excessively high, and the toughness of the weld metal decreases. Therefore, when Ti is added, its content is 0.2 to 2.0 mass% per the total mass of the coating agent. Ti can be added in the form of Fe—Ti, metal Ti, or the like.
［Ｂ化合物（Ｂ換算）：０．０２～０．３質量％］
　Ｂは、粒界フェライトの生成抑制に有効であり、焼入れ性が強い元素である。ただし、被覆剤中のＢ含有量が、Ｂ換算値で、０．０２質量％未満の場合、Ｂによる粒界フェライトの生成抑制効果は得られず、溶接金属の金属組織が粗くなる。一方、被覆剤中のＢの含有量が０．３質量％を超えると、溶接金属が粗大なラス状組織を呈して靭性が劣化する。よって、Ｂを添加する場合は、その含有量（Ｂ換算値）が、被覆剤全質量あたり０．０２～０．３質量％となるようにする。なお、Ｆｅ－Ｂ、Ｆｅ－Ｓｉ－Ｂ及び金属Ｂなどの形態で添加することができる。 [Compound B (converted to B): 0.02 to 0.3% by mass]
B is an element effective in suppressing the formation of grain boundary ferrite and having a strong hardenability. However, when the B content in the coating material is less than 0.02% by mass in terms of B, the effect of suppressing the formation of grain boundary ferrite by B cannot be obtained, and the metal structure of the weld metal becomes rough. On the other hand, if the content of B in the coating exceeds 0.3% by mass, the weld metal exhibits a coarse lath structure and the toughness deteriorates. Therefore, when B is added, its content (B converted value) is set to 0.02 to 0.3% by mass with respect to the total mass of the coating agent. Note that Fe-B, Fe-Si-B, metal B, and the like can be added.
［Ｎｉ：０．５～１０質量％］
　Ｎｉは、溶接金属の強度及び靭性を高める効果があり、特に、溶接部材の使用温度が－４０℃を下回るような場合は、溶接金属の強度と靭性を両立させるために、Ｎｉを添加することが望ましい。ただし、Ｎｉ含有量が、被覆剤全質量あたり、０．５質量％未満の場合、溶接金属の靭性向上の効果が得られない。一方、Ｎｉ含有量が、被覆剤全質量あたり、１０質量％を超えると、溶接金属の強度が高くなりすぎて靭性が低下すると共に、溶接時に高温割れを起こしやすくなる。従って、Ｎｉを添加する場合は、被覆剤全質量あたり、０．５～１０質量％とする。なお、Ｎｉは、金属Ｎｉ、Ｎｉ－Ｍｇ及びＦｅ－Ｎｉなどの形態で添加することができる。 [Ni: 0.5 to 10% by mass]
Ni has the effect of increasing the strength and toughness of the weld metal. In particular, when the use temperature of the welded member is lower than −40 ° C., Ni is added to achieve both the strength and toughness of the weld metal. Is desirable. However, when the Ni content is less than 0.5% by mass with respect to the total mass of the coating agent, the effect of improving the toughness of the weld metal cannot be obtained. On the other hand, when the Ni content exceeds 10% by mass with respect to the total mass of the coating agent, the strength of the weld metal becomes too high and the toughness is lowered, and hot cracking is likely to occur during welding. Therefore, when Ni is added, the content is 0.5 to 10% by mass with respect to the total mass of the coating agent. Ni can be added in the form of metal Ni, Ni—Mg, Fe—Ni, or the like.
［Ｃｒ、Ｍｏ：合計で０．１～３質量％］
　Ｃｒ及びＭｏは、溶接金属の強度を向上させる効果がある。しかし、Ｃｒ及びＭｏの総含有量が、被覆剤全質量あたり、０．１質量％未満の場合、溶接金属の強度向上の効果が得られない。一方、Ｃｒ及びＭｏの総含有量が、被覆剤全質量あたり３質量％を超えると、焼入れ性が過大になると共に、炭化物を生成するため、溶接金属の靭性が劣化する。従って、Ｃｒ及びＭｏを添加する場合は、被覆剤全質量あたり、合計で０．１～３質量％の範囲にする。なお、Ｃｒ及びＭｏは、その両方を添加する必要はなく、いずれか一方のみ添加してもよい。 [Cr, Mo: 0.1 to 3% by mass in total]
Cr and Mo have the effect of improving the strength of the weld metal. However, when the total content of Cr and Mo is less than 0.1% by mass with respect to the total mass of the coating material, the effect of improving the strength of the weld metal cannot be obtained. On the other hand, if the total content of Cr and Mo exceeds 3% by mass with respect to the total mass of the coating material, the hardenability becomes excessive and carbides are generated, so that the toughness of the weld metal deteriorates. Therefore, when Cr and Mo are added, the total amount is in the range of 0.1 to 3% by mass with respect to the total mass of the coating agent. It is not necessary to add both Cr and Mo, and only one of them may be added.
［Ａｌ、Ｍｇ：合計で０．２～２質量％］
　Ａｌ及びＭｇは、強い脱酸剤であり、溶接金属中の酸素量を低減し、靭性を向上させる効果がある。ただし、Ａｌ及びＭｇの総含有量が、被覆剤全質量あたり０．２質量％未満の場合、溶接金属の靭性向上の効果が得られない。一方、Ａｌ及びＭｇの総含有量が、被覆剤全質量あたり、２質量％を超えると、アークが不安定になり、スパッタ発生量が多くなると共に、スラグの粘性が低下してスラグ剥離性が劣化する。従って、Ａｌ及びＭｇを添加する場合は、これらの総含有量を、被覆剤全質量あたり０．２～２質量％とする。なお、Ａｌ及びＭｇは、その両方を添加する必要はなく、いずれか一方のみを添加してもよい。 [Al, Mg: 0.2-2% by mass in total]
Al and Mg are strong deoxidizers and have the effect of reducing the amount of oxygen in the weld metal and improving toughness. However, when the total content of Al and Mg is less than 0.2% by mass with respect to the total mass of the coating material, the effect of improving the toughness of the weld metal cannot be obtained. On the other hand, when the total content of Al and Mg exceeds 2% by mass with respect to the total mass of the coating agent, the arc becomes unstable, the amount of spatter generated increases, the viscosity of the slag decreases, and the slag peelability decreases. to degrade. Therefore, when Al and Mg are added, the total content thereof is 0.2 to 2% by mass with respect to the total mass of the coating agent. Note that it is not necessary to add both of Al and Mg, and only one of them may be added.
［残部］
　被覆剤における上記以外の成分、即ち残部は、Ｆｅ、アルカリ金属酸化物、アルカリ土類金属酸化物及び不可避的不純物などである。また、ここでいう不可避的不純物には、Ｐ、Ｓ、Ｖ、Ｎｂ、Ｓｎ及びＺｒなどが挙げられる。 [Remainder]
Components other than the above in the coating agent, that is, the balance are Fe, alkali metal oxides, alkaline earth metal oxides, unavoidable impurities, and the like. Moreover, P, S, V, Nb, Sn, Zr etc. are mentioned as an unavoidable impurity here.
（鋼心線）
　鋼心線に用いられる鋼材としては、例えば軟鋼や低合金鋼が挙げられる。 (Steel core wire)
Examples of the steel material used for the steel core wire include mild steel and low alloy steel.
　以上詳述したように、本実施形態の低水素系被覆アーク溶接棒では、被覆剤組成、特にＬｉ化合物含有量とＮａ化合物含有量及びＫ化合物含有量との関係を特定しているため、被覆剤の固着性及び溶接作業性を低下させずに、耐吸湿性を向上させることができる。更に、本実施形態の低水素系被覆アーク溶接棒を使用することにより、拡散性水素量が４ｍｌ／１００ｇ以下の溶接金属を得ることができる。 As described above in detail, in the low hydrogen-based coated arc welding rod of this embodiment, the coating composition, in particular, the relationship between the Li compound content and the Na compound content and the K compound content is specified. The moisture absorption resistance can be improved without deteriorating the adhesiveness and welding workability of the agent. Furthermore, a weld metal having a diffusible hydrogen content of 4 ml / 100 g or less can be obtained by using the low hydrogen-based coated arc welding rod of this embodiment.
　最後に、本発明は下記の態様を有するものであることを確認的に付言しておく。
　第１態様：鋼心線を被覆剤で被覆した低水素系被覆アーク溶接棒であって、
前記被覆剤は、
　金属炭酸塩（ＣＯ２換算）：８～２５質量％、
　金属フッ化物（Ｆ換算）：２～１５質量％、
　ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３うち少なくとも１種：合計で２～１０質量％、
　ＳｉＯ２：３～１２質量％、
　Ｓｉ：１～７質量％、
　Ｍｎ：１～８質量％、
　Ｌｉ化合物（Ｌｉ換算）：０．０３～０．７質量％、
　Ｎａ化合物（Ｎａ換算）及びＫ化合物（Ｋ換算）のうち少なくとも一方：合計で１．０～３．５質量％
を含有し、残部がＦｅ及び不可避的不純物からなり、
　Ｌｉ化合物含有量（Ｌｉ換算値）を［Ｌｉ］、Ｎａ化合物含有量（Ｎａ換算値）を［Ｎａ］、Ｋ化合物含有量（Ｋ換算値）を［Ｋ］としたとき、下記数式（１）を満たす組成であり、
　前記被覆剤の被覆率が２２～４５質量％である低水素系被覆アーク溶接棒。
　第２態様：前記被覆剤は、Ｃが０．１質量％以下に規制されている第１態様に記載の低水素系被覆アーク溶接棒。
　第３態様：前記被覆剤は、更に、Ｔｉ：０．２～２．０質量％を含有する第１態様又は第２態様に記載の低水素系被覆アーク溶接棒。
　第４態様：前記被覆剤は、更に、Ｂ化合物（Ｂ換算）：０．０２～０．３質量％を含有する第１態様～第３態様のいずれかに記載の低水素系被覆アーク溶接棒。
　第５態様：前記被覆剤は、更に、Ｎｉ：０．５～１０質量％を含有する第１態様～第４態様のいずれかに記載の低水素系被覆アーク溶接棒。
　第６態様：前記被覆剤は、更に、Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％を含有する第１態様～第５態様のいずれかに記載の低水素系被覆アーク溶接棒。
　第７態様：前記被覆剤は、更に、Ａｌ及びＭｇのうち少なくとも一方：合計で０．２～２質量％を含有する第１態様～第６態様のいずれかに記載の低水素系被覆アーク溶接棒。
　第８態様：前記鋼心線は、軟鋼又は低合金鋼からなる第１態様～第７態様のいずれかに記載の低水素系被覆アーク溶接棒。 Finally, it should be confirmed that the present invention has the following aspects.
A first aspect: a low hydrogen-based arc welding rod in which a steel core wire is coated with a coating agent,
The coating agent is
Metal carbonate (CO 2 equivalent): 8-25% by mass,
Metal fluoride (F conversion): 2 to 15% by mass,
At least one of TiO 2 , ZrO 2 and Al 2 O 3 : 2 to 10% by mass in total,
SiO 2 : 3 to 12% by mass,
Si: 1-7% by mass,
Mn: 1 to 8% by mass,
Li compound (Li conversion): 0.03 to 0.7% by mass,
At least one of Na compound (Na conversion) and K compound (K conversion): 1.0 to 3.5% by mass in total
And the balance consists of Fe and inevitable impurities,
When the Li compound content (Li conversion value) is [Li], the Na compound content (Na conversion value) is [Na], and the K compound content (K conversion value) is [K], the following formula (1) And a composition that satisfies
A low hydrogen-based coated arc welding rod having a coating ratio of 22 to 45 mass%.
2nd aspect: The said coating agent is a low hydrogen type | system | group covering arc welding rod as described in a 1st aspect by which C is controlled to 0.1 mass% or less.
Third aspect: The low hydrogen-based coated arc welding rod according to the first aspect or the second aspect, wherein the coating agent further contains Ti: 0.2 to 2.0% by mass.
Fourth aspect: The low hydrogen-based coated arc welding rod according to any one of the first to third aspects, wherein the coating agent further contains a B compound (converted to B): 0.02 to 0.3 mass%. .
Fifth aspect: The low hydrogen-based coated arc welding rod according to any one of the first to fourth aspects, wherein the coating agent further contains Ni: 0.5 to 10% by mass.
Sixth aspect: The coating agent further includes at least one of Cr and Mo: the total content of 0.1 to 3% by mass. The low hydrogen-based coated arc welding according to any one of the first to fifth aspects rod.
Seventh aspect: The low hydrogen based clad arc welding according to any one of the first to sixth aspects, wherein the coating agent further contains at least one of Al and Mg: 0.2 to 2% by mass in total. rod.
Eighth aspect: The low hydrogen-based coated arc welding rod according to any one of the first to seventh aspects, wherein the steel core wire is made of mild steel or low alloy steel.
　以下、本発明の実施例及び比較例を挙げて、本発明の効果について具体的に説明する。
　本実施例においては、溶接棒塗装機を用いて、下記表１に示す成分組成の鋼心線を、下記表２、３に示す成分組成（焼成後の組成）の被覆剤で被覆した後、４００～５００℃で約１時間焼成し、実施例及び比較例の各低水素系被覆アーク溶接棒を作製した。なお、実施例及び比較例の各溶接棒の被覆率は、下記表２、３に示す通りである。また、下記表１～３に示す鋼心線及び被覆剤の成分組成における残部は、Ｆｅ及び不可避的不純物である。そして、下記表２、３に示すＮｏ．１～３０の溶接棒は本発明の範囲内のものであり、下記表３に示すＮｏ．３１～４８の溶接棒は本発明の範囲から外れるものである。 Hereinafter, the effects of the present invention will be specifically described with reference to Examples and Comparative Examples of the present invention.
In this example, using a welding rod coating machine, after coating the steel core wire of the component composition shown in Table 1 below with a coating agent of the component composition (composition after firing) shown in Tables 2 and 3 below, Firing was performed at 400 to 500 ° C. for about 1 hour to prepare each of the low hydrogen-based coated arc welding rods of Examples and Comparative Examples. In addition, the coverage of each welding rod of an Example and a comparative example is as showing in the following Tables 2 and 3. Further, the balance in the component composition of the steel core wire and the coating agent shown in Tables 1 to 3 below is Fe and inevitable impurities. And No. shown in the following Tables 2 and 3. The welding rods 1 to 30 are within the scope of the present invention. The welding rods 31 to 48 are outside the scope of the present invention.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
　次に、前述した方法で作製した実施例及び比較例の各被覆アーク溶接棒について、耐吸湿性、機械的性能、溶接作業性、被覆剤の固着性及び溶接金属における拡散性水素量を評価した。 Next, for each of the coated arc welding rods of Examples and Comparative Examples prepared by the method described above, moisture absorption resistance, mechanical performance, welding workability, adhesion of the coating material, and the amount of diffusible hydrogen in the weld metal were evaluated. .
＜耐吸湿性＞
　耐吸湿性は、３５０℃の温度条件下で、１時間の加熱により再乾燥させた被覆アーク溶接棒を、温度３０℃、相対湿度８０％の雰囲気中に６時間暴露し、被覆剤が吸湿した水分量をカールフィッシャー法（気化法）で測定することにより評価した。測定時、被覆剤から水分を気化させるために７５０℃で加熱を行い、乾燥空気をキャリアガスとして測定装置へ導いた。その結果、被覆剤中の水分量が３０００質量ｐｐｍ以下のものを良好と判断した。 <Hygroscopic resistance>
The moisture absorption resistance was as follows. The coated arc welding rod re-dried by heating for 1 hour under a temperature condition of 350 ° C. was exposed to an atmosphere of 30 ° C. and 80% relative humidity for 6 hours, and the coating agent absorbed moisture. The water content was evaluated by measuring by the Karl Fischer method (vaporization method). At the time of measurement, heating was performed at 750 ° C. in order to vaporize moisture from the coating material, and the dry air was guided to the measuring device as a carrier gas. As a result, it was judged that the water content in the coating material was 3000 ppm by mass or less.
＜機械的特性・溶接作業性＞
　実施例及び比較例の各被覆アーク溶接棒を使用して溶接を行い、溶接作業性を評価すると共に、参考のため得られた溶接金属の機械的性能を評価した。その際、溶接用鋼板（母材）には、ＪＩＳ　Ｇ　３１０６：２００８　ＳＭ４９０Ａ（板厚２０ｍｍ）を用いた。開先形状は２０°Ｖ開先、開先ギャップは１６ｍｍとした。溶接姿勢は下向、極性はＡＣ（Alternating Current、交流）又はＤＣＥＰ（(Direct Current Electrode Positive、直流棒プラス）とし、溶接電流は１５０～１６０Ａ、溶接電圧は２２～２３Ｖ、溶接入熱は２．０～２．１ｋＪ／ｍｍ、予熱・パス間温度は９０～１１０℃とした。なお、ここでいう溶接作業性とは、アーク安定性、スラグ剥離性およびビード形状のことを言う。 <Mechanical characteristics and welding workability>
Welding was performed using each of the coated arc welding rods of Examples and Comparative Examples to evaluate the welding workability, and the mechanical performance of the weld metal obtained for reference was evaluated. At that time, JIS G 3106: 2008 SM490A (plate thickness 20 mm) was used for the steel plate for welding (base material). The groove shape was 20 ° V groove, and the groove gap was 16 mm. The welding position is downward, the polarity is AC (Alternating Current, AC) or DCEP (Direct Current Electrode Positive), the welding current is 150 to 160 A, the welding voltage is 22 to 23 V, and the welding heat input is 2. The temperature between 0 to 2.1 kJ / mm and the preheating / pass temperature was set to 90 to 110 ° C. The welding workability here refers to arc stability, slag peelability and bead shape.
　また、被覆剤の再乾燥のため、溶接前に、各溶接棒を、３５０℃の温度条件下で１時間加熱した。機械的性能は、溶接金属の引張強さ（ＴＳ（Tensile Strength））及び－２０℃におけるシャルピー衝撃試験の吸収エネルギー（ｖＥ－２０℃）により評価し、引張強さ４９０ＭＰａ以上かつ吸収エネルギー９０Ｊ以上であったものを良好と判断した。一方、溶接作業性は、官能により◎、○、△及び×の４段階の評価し、◎及び○を良好と判断した。なお、これらの機械的特性は、本発明の被覆アーク溶接棒においては必須の特性ではない。このため、評価結果が良好でなくても本発明の効果には影響せず、その他の特性が良好であれば本発明の効果は得られているといえる。 Also, in order to re-dry the coating material, each welding rod was heated at 350 ° C. for 1 hour before welding. Mechanical performance was evaluated by the tensile strength of weld metal (TS (Tensile Strength)) and the absorbed energy (vE-20 ° C) of the Charpy impact test at -20 ° C. What was there was judged to be good. On the other hand, the welding workability was evaluated in four stages of ◎, ○, Δ, and × depending on the sensory, and ◎ and ○ were judged to be good. These mechanical characteristics are not essential characteristics for the coated arc welding rod of the present invention. For this reason, even if the evaluation result is not good, it does not affect the effect of the present invention. If other characteristics are good, it can be said that the effect of the present invention is obtained.
＜被覆剤の固着性＞
　被覆剤の固着性は、先ず、焼成後に、目視により被覆剤表面の割れの有無を観察し、その後、溶接中の保護筒の安定性を、官能により◎、○、△及び×の４段階で評価した。その結果、◎及び○のものを良好と判断した。 <Adhesiveness of coating agent>
The fixing property of the coating material is first observed after firing by visual observation of the presence or absence of cracks on the surface of the coating material, and then the stability of the protective cylinder during welding is classified into four stages according to sensation: ◎, ○, Δ and ×. evaluated. As a result, ◎ and ○ were judged as good.
＜拡散水素量＞
　下向の溶接姿勢で、極性をＡＣ又はＤＣＥＰ（直流棒プラス）とし、溶接電流１５０～１６０Ａ、溶接電圧２２Ｖ、溶接速度１８０ｍｍ／分の条件で１パスの溶接を行った。その際、溶接雰囲気は、温度を２０℃、相対湿度を１０％とした。また、被覆剤の再乾燥のために、溶接前に、各溶接棒を、３５０℃の温度条件下で１時間加熱した。 <Diffusion hydrogen amount>
In a downward welding posture, the polarity was AC or DCEP (direct current rod plus), welding was performed in one pass under conditions of a welding current of 150 to 160 A, a welding voltage of 22 V, and a welding speed of 180 mm / min. At that time, the welding atmosphere was a temperature of 20 ° C. and a relative humidity of 10%. Moreover, in order to re-dry the coating material, each welding rod was heated under a temperature condition of 350 ° C. for 1 hour before welding.
　溶接により得られた溶接金属中の拡散性水素量を、ＪＩＳ　Ｚ　３１１８：２００７に準拠した方法で測定した。その結果、拡散性水素量が４．０ｍｌ／１００ｇ以下のものを、良好と判断した。以上の評価結果を、下記表４にまとめて示す。 The amount of diffusible hydrogen in the weld metal obtained by welding was measured by a method based on JIS Z 3118: 2007. As a result, it was judged that the diffusible hydrogen content was 4.0 ml / 100 g or less. The above evaluation results are summarized in Table 4 below.
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000007
　上記表４に示すように、Ｎｏ．３１の溶接棒は、被覆剤の成分組成において、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]が本発明の範囲を超えているため、耐吸湿性が劣り、拡散水素量も多かった。一方、Ｎｏ．３２の溶接棒は、被覆剤の成分組成において、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]が本発明の範囲に満たないため、被覆剤の固着強度が低く、更に、Ｎａ化合物とＫ化合物の総含有量が本発明の範囲に満たないため、アークが不安定となった。 As shown in Table 4 above, No. The welding rod No. 31 is inferior in hygroscopic resistance because (1.22 × [Na] + 1.49 × [K]) / [Li] exceeds the range of the present invention in the component composition of the coating agent. The amount of diffused hydrogen was also large. On the other hand, no. In the welding rod of 32, in the component composition of the coating, (1.22 × [Na] + 1.49 × [K]) / [Li] is less than the range of the present invention, so that the fixing strength of the coating is low. Furthermore, since the total content of Na compound and K compound is less than the range of the present invention, the arc becomes unstable.
　Ｎｏ．３３の溶接棒は、被覆剤の成分組成において、金属フッ化物が本発明の範囲を超えているためアーク安定性が劣化し、更に、ＳｉＯ２含有量が本発明の範囲を超えているためスラグ剥離性が劣化した。Ｎｏ．３４の溶接棒は、被覆剤の成分組成において、（１．２２×[Ｎａ]＋１．４９×[Ｋ]）／[Ｌｉ]が本発明の範囲を超え、更に、金属炭酸塩含有量及びＬｉ化合物量が本発明の範囲に満たないため、耐吸湿性が劣り、拡散水素量も多かった。 No. In the welding rod No. 33, in the component composition of the coating material, the metal fluoride exceeds the range of the present invention, so that the arc stability is deteriorated. Further, since the SiO 2 content exceeds the range of the present invention, the slag The peelability deteriorated. No. In the welding rod of No. 34, (1.22 × [Na] + 1.49 × [K]) / [Li] exceeds the range of the present invention in the composition of the coating material, and the metal carbonate content and Li Since the amount of the compound was less than the range of the present invention, the hygroscopic resistance was inferior and the amount of diffused hydrogen was large.
　Ｎｏ．３５の溶接棒は、被覆剤の成分組成において、金属炭酸塩含有量が本発明の範囲を超えているためビード形状が劣化し、更に、被覆剤の被覆率が本発明の範囲を超えているためアークが不安定となった。Ｎｏ．３６の溶接棒は、被覆剤の被覆率が本発明の範囲に満たないため、溶接金属中の拡散水素量が増加し、溶接金属の靱性が低下した。 No. In the welding rod of 35, the bead shape deteriorates because the metal carbonate content exceeds the range of the present invention in the component composition of the coating, and the coverage of the coating exceeds the range of the present invention. The arc became unstable. No. As for the 36 welding rod, since the coverage of the coating agent was less than the range of the present invention, the amount of diffused hydrogen in the weld metal increased and the toughness of the weld metal decreased.
　Ｎｏ．３７の溶接棒は、被覆剤の成分組成において、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３の総含有量が本発明の範囲に満たないためビード形状が劣化し、更に、ＳｉＯ２含有量が本発明の範囲に満たないため固着性が低下した。一方、Ｎｏ．３８の溶接棒は、被覆剤の成分組成において、ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３の総含有量が本発明の範囲を超えているため、スラグ剥離性が劣化した。 No. 37 welding rod, in the component composition of the coating agent, TiO 2, the total content of ZrO 2 and Al 2 O 3 is the bead shape because they are smaller than the scope of the present invention deteriorates further, SiO 2 content of the Since it was less than the scope of the invention, the fixing property was lowered. On the other hand, no. Since the total content of TiO 2 , ZrO 2 and Al 2 O 3 exceeded the range of the present invention, the slag peelability of the 38 welding rod was deteriorated.
　Ｎｏ．３９の溶接棒は、被覆剤の成分組成においてＳｉ含有量が本発明の範囲を超えているため、溶融金属の粘性が高くなり、また、Ｎｏ．４０の溶接棒は、被覆剤の成分組成においてＭｎ含有量が本発明の範囲を超えているため、溶融金属の粘性が低下し、いずれもビード形状が劣化した。一方、Ｎｏ．４１の溶接棒は、被覆剤の成分組成において、Ｓｉ含有量及びＭｎ含有量が本発明の範囲に満たないため、溶接金属の脱酸が不足して、ブローホールが発生し、更に溶接金属の靭性も低下した。 No. In the welding rod No. 39, since the Si content exceeds the range of the present invention in the component composition of the coating material, the viscosity of the molten metal is increased. For 40 welding rods, the Mn content in the component composition of the coating exceeded the range of the present invention, so the viscosity of the molten metal decreased and the bead shape deteriorated in all cases. On the other hand, no. In the welding rod No. 41, since the Si content and the Mn content are less than the scope of the present invention in the composition of the coating material, the deoxidation of the weld metal is insufficient, blowholes are generated, and the weld metal The toughness also decreased.
　Ｎｏ．４２の溶接棒は、被覆剤中のＮａ化合物含有量とＫ化合物含有量の合計が本発明の範囲を超えているため、耐吸湿性が劣っていた。Ｎｏ．４３の溶接棒は、被覆剤の成分組成において、金属フッ化物含有量が本発明の範囲に満たないため、スラグの粘性が高くなり、ビード形状が劣化した。Ｎｏ．４４の溶接棒は、被覆剤の成分組成において、Ｌｉ化合物含有量が本発明の範囲を超えているため、被覆剤の固着強度が低下した。 No. The 42 welding rod was inferior in moisture absorption resistance because the total of Na compound content and K compound content in the coating exceeded the range of the present invention. No. In 43 welding rods, the metal fluoride content was less than the range of the present invention in the component composition of the coating, so the viscosity of the slag increased and the bead shape deteriorated. No. As for the welding rod of No. 44, since the Li compound content exceeded the range of the present invention in the component composition of the coating material, the fixing strength of the coating material decreased.
　一方、Ｎｏ．４５の溶接棒は、耐吸湿特性、被覆剤の固着性及び溶接作業性は良好であったが、被覆剤に、２．０質量％を超えてＴｉを添加すると共に０．３質量％を超えてＢ化合物を添加しているため、溶接金属の靭性が低下した。同様に、Ｎｏ．４６の溶接棒も、耐吸湿特性、被覆剤の固着性及び溶接作業性は良好であったが、被覆剤に１０質量％を超えてＮｉを添加しているため、溶接金属の靭性が低下した。 On the other hand, No. The welding rod of No. 45 had good moisture absorption resistance, adhesion of the coating material and welding workability. However, Ti was added to the coating material in an amount exceeding 2.0 mass% and exceeding 0.3 mass%. Since the B compound was added, the toughness of the weld metal was lowered. Similarly, no. The 46 welding rod also had good moisture absorption characteristics, coating adhesiveness and welding workability, but the Ni added to the coating exceeded 10% by mass, so the weld metal toughness decreased. .
　また、Ｎｏ．４７の溶接棒も、耐吸湿特性、被覆剤の固着性及び溶接作業性は良好であったが、被覆剤に３質量％を超えてＣｒ及びＭｏを添加しているため、溶接金属の靭性が低下した。一方、Ｎｏ．４８の溶接棒は、被覆剤に２質量％を超えてＡｌ及びＭｇを添加しているため、アークが不安定になり、更にスラグ剥離性も低下した。 Also, No. The 47 welding rod also had good moisture absorption characteristics, adhesion of the coating and welding workability. However, since Cr and Mo were added to the coating exceeding 3% by mass, the toughness of the weld metal was high. Declined. On the other hand, no. In the 48 welding rod, since Al and Mg were added in an amount exceeding 2% by mass to the coating agent, the arc became unstable and the slag peelability was also lowered.
　これに対して、本発明の範囲内で作製したＮｏ．１～３０の溶接棒は、耐吸湿性に優れ、被覆剤の固着性及び溶接作業性も良好であった。加えて、Ｎｏ．１～２８，３０の溶接棒は、Ｔｉ、Ｂ化合物、Ｎｉ、Ｃｒ、Ｍｏ、Ａｌ及びＭｇのうち１種又は２種以上の元素を特定量含有しているため、これらの元素の含有量が少ないＮｏ．２９の溶接棒に比べて、溶接金属の機械的特性が優れていた。 In contrast, No. produced within the scope of the present invention. The welding rods 1 to 30 were excellent in moisture absorption resistance, and had good coating adhesion and welding workability. In addition, no. Since the welding rods 1 to 28, 30 contain a specific amount of one or more elements of Ti, B compound, Ni, Cr, Mo, Al and Mg, the content of these elements is Less No. Compared to 29 welding rods, the mechanical properties of the weld metal were superior.
　以上の結果から、本発明によれば、耐吸湿特性に優れ、被覆剤の固着性及び溶接作業性も良好な低水素系被覆アーク溶接棒を得られることが確認された。 From the above results, it was confirmed that according to the present invention, it is possible to obtain a low hydrogen-based coated arc welding rod that is excellent in moisture absorption resistance, and has good adhesion of the coating and welding workability.
　本出願は、出願日が２０１４年１月７日である日本国特許出願、特願第２０１４－００１０７３号を基礎出願とする優先権主張を伴い、特願第２０１４－００１０７３号は参照することにより本明細書に取り込まれる。 This application is accompanied by a priority claim based on Japanese Patent Application No. 2014-001073, whose application date is January 7, 2014, and Japanese Patent Application No. 2014-001073 is referred to by reference. Incorporated herein.

Claims (10)

  1. 　鋼心線を被覆剤で被覆した低水素系被覆アーク溶接棒であって、
    　前記被覆剤は、
    　　金属炭酸塩（ＣＯ２換算）：８～２５質量％、
    　　金属フッ化物（Ｆ換算）：２～１５質量％、
    　　ＴｉＯ２、ＺｒＯ２及びＡｌ２Ｏ３のうち少なくとも１種：合計で２～１０質量％、
    　　ＳｉＯ２：３～１２質量％、
    　　Ｓｉ：１～７質量％、
    　　Ｍｎ：１～８質量％、
    　　Ｌｉ化合物（Ｌｉ換算）：０．０３～０．７質量％、
    　　Ｎａ化合物（Ｎａ換算）及びＫ化合物（Ｋ換算）のうち少なくとも一方：合計で１．０～３．５質量％
    を含有し、残部がＦｅ及び不可避的不純物からなり、
    　Ｌｉ化合物含有量（Ｌｉ換算値）を［Ｌｉ］、Ｎａ化合物含有量（Ｎａ換算値）を［Ｎａ］、Ｋ化合物含有量（Ｋ換算値）を[Ｋ]としたとき、下記数式（１）を満たす組成であり、
    　前記被覆剤の被覆率が２２～４５質量％である
    低水素系被覆アーク溶接棒。
    Figure JPOXMLDOC01-appb-I000001
    A low hydrogen-based coated arc welding rod in which a steel core wire is coated with a coating agent,
    The coating agent is
    Metal carbonate (CO 2 equivalent): 8-25% by mass,
    Metal fluoride (F conversion): 2 to 15% by mass,
    At least one of TiO 2 , ZrO 2 and Al 2 O 3 : 2 to 10% by mass in total,
    SiO 2 : 3 to 12% by mass,
    Si: 1-7% by mass,
    Mn: 1 to 8% by mass,
    Li compound (Li conversion): 0.03 to 0.7% by mass,
    At least one of Na compound (Na conversion) and K compound (K conversion): 1.0 to 3.5% by mass in total
    And the balance consists of Fe and inevitable impurities,
    When the Li compound content (Li conversion value) is [Li], the Na compound content (Na conversion value) is [Na], and the K compound content (K conversion value) is [K], the following formula (1) And a composition that satisfies
    A low hydrogen-based coated arc welding rod having a coating ratio of 22 to 45 mass%.
    Figure JPOXMLDOC01-appb-I000001
  2. 　前記被覆剤は、Ｃが０．１質量％以下に規制されている請求項１に記載の低水素系被覆アーク溶接棒。 The low hydrogen-based coated arc welding rod according to claim 1, wherein C is regulated to 0.1% by mass or less.
  3. 　前記被覆剤は、更に、Ａｌ及びＭｇのうち少なくとも一方：合計で０．２～２質量％を含有する請求項１に記載の低水素系被覆アーク溶接棒。 The low hydrogen-based coated arc welding rod according to claim 1, wherein the coating further contains at least one of Al and Mg: 0.2 to 2% by mass in total.
  4. 　前記鋼心線は、軟鋼又は低合金鋼からなる請求項１に記載の低水素系被覆アーク溶接棒。 The low hydrogen-based coated arc welding rod according to claim 1, wherein the steel core wire is made of mild steel or low alloy steel.
  5. 　前記被覆剤は、更に、Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。 The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, wherein the coating further contains at least one of Cr and Mo: a total of 0.1 to 3% by mass.
  6. 　前記被覆剤は、更に、
    　　Ｔｉ：０．２～２．０質量％、および
    　　Ｂ化合物（Ｂ換算）：０．０２～０．３質量％
    　を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。     The coating further comprises:
    Ti: 0.2 to 2.0% by mass, and B compound (B conversion): 0.02 to 0.3% by mass
    The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, comprising:
  7. 　前記被覆剤は、更に、
    　　Ｎｉ：０．５～１０質量％、
    　　Ｔｉ：０．２～２．０質量％、および
    　　Ｂ化合物（Ｂ換算）：０．０２～０．３質量％
    　を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。     The coating further comprises:
    Ni: 0.5 to 10% by mass,
    Ti: 0.2 to 2.0% by mass, and B compound (B conversion): 0.02 to 0.3% by mass
    The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, comprising:
  8. 　前記被覆剤は、更に、
    　　Ｎｉ：０．５～１０質量％、および
    　　Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％
    　を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。     The coating further comprises:
    Ni: 0.5 to 10% by mass, and at least one of Cr and Mo: 0.1 to 3% by mass in total
    The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, comprising:
  9. 　前記被覆剤は、更に、
    　　Ｎｉ：０．５～１０質量％、
    　　Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％、および
    　　Ｂ化合物（Ｂ換算）：０．０２～０．３質量％
    　を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。     The coating further comprises:
    Ni: 0.5 to 10% by mass,
    At least one of Cr and Mo: 0.1 to 3% by mass in total, and B compound (B conversion): 0.02 to 0.3% by mass
    The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, comprising:
  10. 　前記被覆剤は、更に、
    　　Ｎｉ：０．５～１０質量％、
    　　Ｃｒ及びＭｏのうち少なくとも一方：合計で０．１～３質量％、
    　　Ｔｉ：０．２～２．０質量％、および
    　　Ｂ化合物（Ｂ換算）：０．０２～０．３質量％
    　を含有する請求項１～４のいずれか１項に記載の低水素系被覆アーク溶接棒。     The coating further comprises:
    Ni: 0.5 to 10% by mass,
    At least one of Cr and Mo: 0.1 to 3% by mass in total,
    Ti: 0.2 to 2.0% by mass, and B compound (B conversion): 0.02 to 0.3% by mass
    The low hydrogen-based coated arc welding rod according to any one of claims 1 to 4, comprising:
PCT/JP2014/084438 2014-01-07 2014-12-25 Low-hydrogen type coated arc welding electrode WO2015105011A1 (en)

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CN201480072045.8A CN105873717B (en) 2014-01-07 2014-12-25 Low hydrogen system coated electrode
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