CN109158796B - Flux-cored wire matched with bridge steel Q690qE - Google Patents
Flux-cored wire matched with bridge steel Q690qE Download PDFInfo
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Classifications
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- 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
- B23K35/24—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
- B23K35/40—Making wire or rods for soldering or welding
-
- 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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention belongs to the technical field of welding materials, and particularly relates to a flux-cored wire matched with bridge steel Q690qE and a preparation method thereof. The flux-cored wire is prepared by wrapping low-carbon cold-rolled steel strips with flux-cored powder, and the flux-cored powder accounts for 20-35% of the total mass of the flux-cored wire. The medicine core comprises the following components in percentage by mass: 3.0-5.5% of FNiN-50 nano nickel powder, 0.5-1.2% of nano chromium nitride powder, 0.2-0.4% of nano graphene, 0.2-0.8% of nano cerium oxide, 1.2-2.0% of FeMn84C0.05 micro carbon ferromanganese, 1.0-2.0% of AlSi50 aluminum intermediate alloy, 0.25-0.45% of Nb powder, 2.5-4.5% of Mo powder, 0.4-1.0% of Cu powder, 0.5-1.0% of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), 0.5-1.0% of KBF powder42.5 to 3.5 percent of the iron powder, and the balance being FHT 100.25 reduced iron powder.
Description
Technical Field
The invention relates to the field of welding materials, in particular to a flux-cored wire matched with bridge steel Q690 qE.
Background
The main requirements of bridge steel are: high low-temperature impact toughness; high atmospheric corrosion resistance; high tensile strength; the smaller the yield ratio, the stronger the potential ability of the structure to resist damage, once overloaded, plastic deformation can be found early without destructive damage, but if the yield ratio is too small, the effective utilization rate of the material is low;
the bridge steel in China undergoes a relatively long development process, and the yield strength of the steel plate used for constructing the finished bridge gradually develops from 235MPa to 345MPa and then to 370MPa to 420MPa and 500 MPa. A new generation of bridge steel Q500qE with the yield strength grade of 500MPa is adopted by a Shangtong bridge constructed by beginning in 2015. With the progress of science and technology and the need of economic development, the bridge steel of 550MPa level, 620MPa level and 690MPa level is also put into practice, in particular to Q690qE bridge steel which is a high-requirement steel for building a new generation of high-strength, high-toughness and high-fatigue-resistance bridge, and not only needs to have certain strength and bear the load and the impact toughness of a locomotive vehicle, but also needs to have the yield ratio within a certain range as small as possible, has higher requirements on the low-temperature impact toughness and has good atmospheric corrosion resistance.
GB/T714-2015 structural steel for bridges replaces GB/T714-2008, wherein the most important modification is to absorb energy (KV) by low-temperature impact2) The value is greatly adjusted, and the original KV at 40 ℃ below zero is adjusted2The value is increased from 47J to 120J, the recommended yield ratio is increased in appendix B (Q345Q, Q370Q and Q420Q are not more than 0.85, protocols Q460Q-Q690Q can be executed by referring to 0.85), a calculation formula for predicting the corrosion resistance index I of the steel by using the chemical components of the steel is provided in appendix C, and the steel has a better atmospheric corrosion resistance index I which is not less than 6.0 according to the ASTM related standard.
At present, no matched flux-cored wire for welding Q690qE bridge steel exists, and the research and development of the new-variety welding wire is the urgent priority of technologists.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a flux-cored wire matched with bridge steel Q690qE, wherein the flux-cored wire has deposited metal chemical components, deposited metal mechanical properties and deposited metal corrosion resistance, and can meet the welding requirements of bridge steel Q690 qE.
In order to achieve the purpose, the invention adopts the following technical scheme: a flux-cored wire matched with bridge steel Q690qE comprises a sheath and a flux core, wherein the flux core comprises the following components in parts by mass: 3.0-5.5% of FNiN-50 nano nickel powder, 0.5-1.2% of nano chromium nitride powder, 0.2-0.4% of nano graphene, 0.2-0.8% of nano cerium oxide, 1.2-2.0% of FeMn84C0.05 micro carbon ferromanganese, 1.0-2.0% of AlSi50 aluminum intermediate alloy, 0.25-0.45% of Nb powder, 2.5-4.5% of Mo powder, 0.4-1.0% of Cu powder, 0.5-1.0% of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), 0.5-1.0% of KBF powder42.5 to 3.5 percent of the chromium nitride powder, the balance being FHT 100.25 reduced iron powder, the grain diameter of the nanometer chromium nitride powder is 50 to 120nm,the particle size of the nano graphene is 30-80 nm, and the particle size of the nano cerium oxide is 40-100 nm.
The mass of the flux core accounts for 20-35% of the total mass (namely the filling rate) of the flux-cored wire.
Preferably, the 80-mesh passing rate of the medicine core powder is 100%.
Preferably, the purity of the nano chromium nitride is greater than or equal to 99.6%, the purity of the nano graphene is greater than or equal to 99.5%, the purity of the nano cerium oxide is greater than or equal to 99.0%, the purity of the Nb is greater than or equal to 99.9%, the purity of the Mo is greater than or equal to 99.9%, the purity of the Cu is greater than or equal to 99.6%, the purity of the hafnium zirconium alloy powder is greater than or equal to 99.0%, and the purity of the KBF is greater than or equal4The purity of the product is more than or equal to 99.5 percent.
The diameter of the welding wire is 1.2-4.0 mm.
The outer skin is a low-carbon cold-rolled steel strip with the width of 8-20 mm and the thickness of 0.25-1.8 mm, and the steel strip comprises the following chemical components in percentage by mass: 0-0.003% of C, 0.2-0.35% of Mn, 0-0.028% of Si, 0-0.001% of S, 0-0.001% of P and the balance of Fe; the tensile strength of the steel strip is 260-380 MPa, and the elongation is not less than 42%.
A flux-cored wire matched with bridge steel Q690qE is prepared by the following steps:
(1) selecting materials: selecting the raw materials of the chemical components for quality purity control;
(2) treating the medicinal powder: putting the medicinal powder into an open quartz container, and then putting the medicinal powder into a drying oven for drying at 160 +/-5 ℃ for 1.5-2 h;
(3) powder sieving: sieving the dried powder with 80 mesh sieve, respectively, storing the fine powder after sieving, and removing impurities;
(4) powder preparation and mixing: weighing the sieved medicinal powder in proportion, adding the medicinal powder into a powder mixing machine, stirring and mixing the medicinal powder and the powder, and stirring and mixing the medicinal powder and the powder to form mixed medicinal powder;
(5) rolling a steel belt and packaging medicinal powder: and (3) placing the low-carbon cold-rolled steel strip on a strip placing machine of a flux-cored wire forming machine, manufacturing the low-carbon cold-rolled steel strip into a U-shaped groove through the forming machine, adding the mixed powder obtained in the step (4) into the U-shaped groove, rolling and closing the U-shaped groove through the forming machine to form an O shape, wrapping the powder in the O shape, drawing and reducing the powder channel by channel through a wire drawing machine to 1.2-4.0 mm, obtaining the flux-cored wire, coiling the flux-cored wire into a disc, and sealing and packaging.
The design principle of each chemical element in the flux-cored wire matched with the bridge steel Q620qF provided by the invention is as follows:
ni: the Ni is derived from the FNiN-50 nano nickel powder, can improve the strength and impact toughness of deposited metal, particularly improve the low-temperature impact toughness of the deposited metal, reduce the brittle transition temperature, and has excellent atmospheric corrosion resistance.
Cr: the chromium nitride is derived from chromium nitride, under the action of arc heat input, part of the chromium nitride is decomposed into Cr element and N element, wherein Cr can improve the corrosion resistance of deposited metal, and ferrite grains can be refined to increase the toughness of a secondary structure of the metal.
N: since the chromium nitride is originally derived, under the action of arc heat input, part of the chromium nitride is decomposed, part of decomposed N element is volatilized, and part of decomposed N element is dissolved in iron to form a gap type solid solution, so that the low-temperature impact toughness of the deposited metal is remarkably improved.
C: from graphene, the influence of alloying elements on mechanical properties depends not only on the type, size, shape, amount and distribution of carbides formed by carbon and alloying elements, but also on the size of crystal grains and the distribution uniformity of the alloying elements. In order to obtain carbon in the welding seam, a certain amount of graphene is added into the flux-cored wire, so that the uniform distribution of C elements can be promoted.
Cerium oxide: the cerium oxide has an effect of refining crystal grains and can promote uniform distribution of alloying elements in the deposited metal.
The nano nickel and the nano chromium nitride which is not decomposed in time are taken as nucleation mass points to play a role of non-spontaneous nucleation, so that the crystal grains of deposited metal can be refined, and the distribution of alloy elements is homogenized.
In addition, as the nano-sized structures of the nano nickel, the nano chromium nitride, the nano graphene and the nano cerium oxide are easily combined with other atoms, inclusions with uneven sizes cannot be generated in deposited metal, surface atoms of the inclusions have extremely high chemical activity and are unstable and easy to combine with other atoms, a large number of interfaces provide a high-density short-distance fast diffusion path for atomic diffusion, so that the inclusions are easier to diffuse in a metal melt, the comprehensive mechanical properties of the deposited metal can be effectively improved, and particularly the low-temperature impact toughness is greatly improved.
Mn: mn is a beneficial element for increasing the obdurability of the weld metal, and the increase of the content of the manganese is not only beneficial to preventing the weld metal from generating hot cracks, but also beneficial to deoxidizing the weld metal. If the manganese content is too high, segregation and cracking of the deposited metal tend to occur, and the carbon equivalent of the deposited metal tends to be too large, so that there is a risk of lowering the toughness of the weld metal.
Al: the Al is from AlSi50 aluminum intermediate alloy, the Al is used as a strong deoxidizer and has the functions of desulfuration and dephosphorization, the aluminum not only can reduce the sensitivity of deposited metal to gaps, reduce or eliminate the aging phenomenon of the deposited metal and reduce the ductile-brittle transition temperature, but also can reduce the notch sensitivity of the deposited metal. Improve the low-temperature impact toughness of the deposited metal.
Si: si is derived from AlSi50 aluminum master alloy, has good deoxidation effect, is dissolved in ferrite and austenite, and can improve the strength of the weld metal. Meanwhile, the addition of a certain amount of silicon can also increase the fluidity of weld metal, so that the welding wire has good welding process performance in the welding process.
Nb: nb has good corrosion resistance and good stabilizing effect on a beta phase, reduces the content of impurity elements such as carbon, oxygen and the like, obviously improves the corrosion resistance of deposited metal, and can also improve the impact toughness of the deposited metal to a certain extent.
Mo: mo can form MoC and Mo with C2And C, the two particles are uniformly distributed in the structure and are used as external cores during crystallization, and the grain growth and the movement of carbide grain boundaries in the crystallization process are controlled, so that the structure is refined, and the strength and the impact toughness of the deposited metal are improved.
Cu: the corrosion resistance is improved, and the atmospheric corrosion resistance is enhanced; when the mass fraction of Cu is less than 0.50%, the effect is mainly represented by solid solution strengthening.
B: b is derived from KBF4And B may beThe solid solution is in austenite grain boundary, so that the grain boundary effect is strengthened, the nucleation and growth of proeutectoid ferrite are inhibited, the formation of ferrite in the grain boundary is avoided, the ductile-brittle transition temperature of deposited metal is reduced, and the low-temperature impact toughness of the deposited metal can be effectively improved.
F: f is derived from KBF4Fluorine ions generated in the welding process react with hydrogen, so that the residual hydrogen content of deposited metal can be reduced, and the low-temperature impact toughness of the deposited metal is further improved.
Zr and Hf: zr and Hf, which are original zirconium hafnium alloy powder, are strong toughness elements and particularly have obvious effect on improving the low-temperature impact toughness of deposited metal.
The invention has the beneficial effects that:
1) the flux-cored wire matched with the bridge steel Q690qE provided by the invention takes Ni, Cr, Mn, Nb, Al, Mo, Cu, Zr and Hf as main components, is matched with graphene and B, N, is supplemented with other components, and through reasonably selecting the components and regulating the content of the components, the components generate a synergistic promotion effect, so that the low-temperature impact toughness and the atmospheric corrosion resistance of the wire are effectively improved.
2) The flux-cored wire matched with the bridge steel Q690qE provided by the invention provides a high-density short-distance fast diffusion path for atomic diffusion by adding Ni, CrN and CeO nano-sized particles, so that the flux-cored wire is easier to diffuse in a metal melt, and the generation of inclusions with uneven sizes is avoided.
3) According to the flux-cored wire matched with the bridge steel Q690qE, the nano graphene is added, so that the C content is improved to a certain extent, and the low-temperature impact toughness is ensured while the strength is improved by utilizing the characteristic of uniform distribution of the C content.
4) By limiting the contents of Cr and Cu, the atmospheric corrosion resistance is improved while the impact toughness is enhanced by refining grains.
The welding on the bridge steel 690qE shows that: the welding wire has excellent welding process performance, easy slag removal of welding seams and attractive forming, the chemical components and the mechanical properties of deposited metal of the welding wire meet the welding requirement of 690 MPa-grade bridge steel, the yield ratio is less than or equal to 0.80, and KV is realized at-40 DEG C2Minimum value of (2)Is 146J, KV at-60 deg.C2The minimum value of the air corrosion resistance index value is 79J, and the air corrosion resistance index value I is not less than 6.349.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1:
a flux-cored wire matched with bridge steel Q690qE is composed of a low-carbon cold-rolled steel strip and flux-cored powder wrapped by the low-carbon cold-rolled steel strip.
The following steps are first performed: selecting materials → processing medicinal powder → sieving powder → mixing powder and mixing powder; then selecting a low-carbon cold-rolled steel strip with the width of 16mm and the thickness of 0.6mm, and pressing the low-carbon cold-rolled steel strip into a U shape through a forming machine; filling the mixed powder into a U-shaped groove, wherein the mass of the powder accounts for 25% of that of the flux-cored wire; and then closing the opening of the U-shaped groove to form an O shape, so that the flux core is wrapped in the O shape, and drawing and reducing the diameter of the flux core one by a wire drawing machine to obtain a welding wire with the phi of 3.2mm, namely the flux core welding wire matched with the bridge steel Q690E.
The flux core comprises the following components in percentage by mass: 3.0-5.5% of FNiN-50 nano nickel powder, 0.5-1.2% of nano chromium nitride powder, 0.2-0.4% of nano graphene, 0.2% of nano cerium oxide, 1.2% of FeMn84C0.05 micro carbon ferromanganese, 1.0% of AlSi50 aluminum intermediate alloy, 0.25% of Nb powder, 2.5% of Mo powder, 0.4% of Cu powder, 0.5% of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), and 0.5% of KBF42.5 percent, and the balance being FHT 100.25 reduced iron powder.
Example 2:
a flux-cored wire matched with bridge steel Q690qE is composed of a low-carbon cold-rolled steel strip and flux-cored powder wrapped by the low-carbon cold-rolled steel strip.
The following steps are first performed: selecting materials → processing medicinal powder → sieving powder → mixing powder and mixing powder; then selecting a low-carbon cold-rolled steel strip with the width of 16mm and the thickness of 0.6mm, and pressing the low-carbon cold-rolled steel strip into a U shape through a forming machine; filling the mixed powder into a U-shaped groove, wherein the mass of the powder accounts for 25% of that of the flux-cored wire; and then closing the opening of the U-shaped groove to form an O shape, so that the flux core is wrapped in the O shape, and drawing and reducing the diameter of the flux core one by a wire drawing machine to obtain a welding wire with the phi 2.8mm, namely the flux core welding wire matched with the bridge steel Q620 qF.
The flux core comprises the following components in percentage by mass: 4.0 percent of FNiN-50 nano nickel powder, 0.7 percent of nano chromium nitride powder, 0.25 percent of nano graphene, 0.3 percent of nano cerium oxide, 1.4 percent of FeMn84C0.05 micro carbon ferromanganese, 1.2 percent of AlSi50 aluminum intermediate alloy, 0.30 percent of Nb powder, 3.0 percent of Mo powder, 0.5 percent of Cu powder, 0.7 percent of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), and KBF42.8 percent, and the balance being FHT 100.25 reduced iron powder.
Example 3:
a flux-cored wire matched with bridge steel Q690qE is composed of a low-carbon cold-rolled steel strip and flux-cored powder wrapped by the low-carbon cold-rolled steel strip.
The following steps are first performed: selecting materials → processing medicinal powder → sieving powder → mixing powder and mixing powder; then selecting a low-carbon cold-rolled steel strip with the width of 16mm and the thickness of 0.6mm, and pressing the low-carbon cold-rolled steel strip into a U shape through a forming machine; filling the mixed powder into a U-shaped groove, wherein the mass of the powder accounts for 25% of that of the flux-cored wire; and then closing the opening of the U-shaped groove to form an O shape, so that the flux core is wrapped in the O shape, and drawing and reducing the diameter of the flux core one by a wire drawing machine to obtain a welding wire with the phi 2.0mm, namely the flux core welding wire matched with the bridge steel Q620 qF.
The flux core comprises the following components in percentage by mass: 4.5 percent of FNiN-50 nano nickel powder, 0.9 percent of nano chromium nitride powder, 0.35 percent of nano graphene, 0.6 percent of nano cerium oxide, 1.6 percent of FeMn84C0.05 micro carbon ferromanganese, 1.5 percent of AlSi50 aluminum intermediate alloy, 0.35 percent of Nb powder, 3.5 percent of Mo powder, 0.8 percent of Cu powder, 0.85 percent of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), and KBF43.0 percent, and the balance being FHT 100.25 reduced iron powder.
Example 4:
a flux-cored wire matched with bridge steel Q690qE is composed of a low-carbon cold-rolled steel strip and flux-cored powder wrapped by the low-carbon cold-rolled steel strip.
The following steps are first performed: selecting materials → processing medicinal powder → sieving powder → mixing powder and mixing powder; then selecting a low-carbon cold-rolled steel strip with the width of 16mm and the thickness of 0.6mm, and pressing the low-carbon cold-rolled steel strip into a U shape through a forming machine; filling the mixed powder into a U-shaped groove, wherein the mass of the powder accounts for 25% of that of the flux-cored wire; and then closing the opening of the U-shaped groove to form an O shape, so that the flux core is wrapped in the O shape, and drawing and reducing the diameter of the flux core one by a wire drawing machine to obtain a welding wire with the phi 1.6mm, namely the flux core welding wire matched with the bridge steel Q690E.
The flux core comprises the following components in percentage by mass: the flux core comprises the following components in percentage by mass: 5.0 percent of FNiN-50 nano nickel powder, 1.0 percent of nano chromium nitride powder, 0.35 percent of nano graphene, 0.7 percent of nano cerium oxide, 1.8 percent of FeMn84C0.05 micro carbon ferromanganese, 1.8 percent of AlSi50 aluminum intermediate alloy, 0.40 percent of Nb powder, 4.0 percent of Mo powder, 0.8 percent of Cu powder, 0.8 percent of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), and 0.8 percent of KBF43.2 percent, and the balance being FHT 100.25 reduced iron powder.
Example 5:
a flux-cored wire matched with bridge steel Q690qE is composed of a low-carbon cold-rolled steel strip and flux-cored powder wrapped by the low-carbon cold-rolled steel strip.
The following steps are first performed: selecting materials → processing medicinal powder → sieving powder → mixing powder and mixing powder; then selecting a low-carbon cold-rolled steel strip with the width of 16mm and the thickness of 0.6mm, and pressing the low-carbon cold-rolled steel strip into a U shape through a forming machine; filling the mixed powder into a U-shaped groove, wherein the mass of the powder accounts for 25% of that of the flux-cored wire; and then closing the opening of the U-shaped groove to form an O shape, so that the flux core is wrapped in the O shape, and drawing and reducing the diameter of the flux core one by a wire drawing machine to obtain a welding wire with the phi 1.2mm, namely the flux core welding wire matched with the bridge steel Q690E.
The flux core comprises the following components in percentage by mass: 5.5 percent of FNiN-50 nano nickel powder, 1.2 percent of nano chromium nitride powder, 0.4 percent of nano graphene, 0.8 percent of nano cerium oxide, 2.0 percent of FeMn84C0.05 micro carbon ferromanganese, 2.0 percent of AlSi50 aluminum intermediate alloy, 0.45 percent of Nb powder, 4.5 percent of Mo powder, 1.0 percent of Cu powder, 0.5 to 1.0 percent of zirconium hafnium alloy powder (the mass ratio of the two is 96: 4), and KBF43.5 percent, and the balance being FHT 100.25 reduced iron powder.
Comparative example 1:
the components and the dosage of the flux core of the comparative example are completely the same as those of the example 5 except that the FNiN-50 nano nickel powder and the nano chromium nitride are not used.
Comparative example 2:
the components and the dosage of the flux core of the comparative example and the example 5 are completely the same except that no nano graphene or nano cerium oxide exists, and the preparation process of the comparative example is completely the same as that of the example 5.
Comparative example 3:
the ingredients and the dosage of the flux core of the comparative example are completely the same as those of the example 5 except that the flux core does not contain FeMn84C0.05 micro carbon ferromanganese and AlSi50 aluminum intermediate alloy.
Comparative example 4:
except that the components and the dosage of the flux core of the comparative example and the example 5 are changed into nickel powder, chromium nitride powder, graphene oxide and cerium oxide from 'FNiN-50 nanometer nickel powder, nanometer chromium nitride powder, nanometer graphene and nanometer cerium oxide', the other components and the dosage are completely the same, and the preparation process of the comparative example is completely the same as that of the example 5.
The welding wires obtained in examples 1, 2, 3, 4, 5 and comparative examples 1, 2, 3, 4 were welded on bridge steel Q690qE using CO2Gas shield, CO2Gas purity greater than 99.5%, H2O is less than 0.2 percent. The welding current is 180-260A, the welding voltage is 22-28V, the welding speed is 18-20 mm/s, and the gas flow is 25L/min. The method comprises the following steps of evaluating the process performance according to GB/T25776-2010 welding material welding process performance evaluation method, analyzing the chemical components of deposited metal according to GB/T223 series standards, testing the mechanical performance according to GB/T2652-:
I＝26.01(%Cu)＋3.88(%Ni)＋1.20(%Cr)＋1.49(%Si)＋17.28(%P)－7.29(%Cu)(%Ni)－9.10(%Ni)(%P)－33.39(%Cu)2
the deposited metal chemical composition is shown in table 1.
The deposited metal mechanical properties and corrosion resistance of the flux-cored wire are shown in table 2.
The above examples and comparative examples show that: when the components and the using amount are in the required range, the reasonable design of the elements meets the requirement of atmospheric corrosion resistance of weld deposit metal, and the values of the yield strength, the tensile strength, the yield ratio and the low-temperature impact absorption energy all meet the requirements; secondly, when the 'FNiN-50 nano nickel powder and nano chromium nitride' are not added, or the 'nano graphene and nano cerium oxide' are not added, or the 'FeMn84C0.05 micro carbon ferromanganese and AlSi50 aluminum intermediate alloy' are not added, or the 'FNiN-50 nano nickel powder, nano chromium nitride powder, nano graphene and nano cerium oxide' are changed into the 'nickel powder, chromium nitride powder, graphene and cerium oxide', the reasonable design of other elements except the comparative example 1 (no Ni and Cr elements are used in the example) can meet the atmospheric corrosion resistance requirement of the weld deposit metal, so that the atmospheric corrosion resistance is obviously improved, but the yield strength, the tensile strength and the yield ratio do not meet the requirements, and the low-temperature impact absorption energy value is greatly lower than the required value.
The innovative core of the invention is to provide the components and the dosage of the flux core, and the components are reasonably selected and the content of the components is regulated, so that the components generate a synergistic promotion effect, and the low-temperature impact toughness and the atmospheric corrosion resistance of the welding wire are effectively improved. Particularly, FNiN-50 nano nickel powder, nano chromium nitride powder, nano graphene and nano cerium oxide are added into the medicine core powder, the reasonable range of each component is optimized, and the yield ratio is reduced, the low-temperature impact toughness is effectively improved, and the atmospheric corrosion resistance is enhanced on the premise of ensuring the use strength through the composite reinforcement of various elements. The addition of the nano-sized particles provides a high-density short-distance fast diffusion path for atomic diffusion, so that the nano-sized particles are easier to diffuse in a metal melt, the generation of inclusions with uneven sizes is avoided, the chemical components of deposited metal are purified, and the strength and the low-temperature impact toughness of the deposited metal are improved. It should be noted that, it is not essential to add one of the components, but rather the combination of the components and amounts of the components is the core of the present invention.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A flux-cored wire matched with bridge steel Q690qE comprises a sheath and a flux core, wherein the flux core comprises the following components in percentage by mass: 3.0-5.5% of FNiN-50 nano nickel powder, 0.5-1.2% of nano chromium nitride powder, 0.2-0.4% of nano graphene, 0.2-0.8% of nano cerium oxide, 1.2-2.0% of FeMn84C0.05 micro carbon ferromanganese, 1.0-2.0% of AlSi50 aluminum intermediate alloy, 0.25-0.45% of Nb powder, 2.5-4.5% of Mo powder, 0.4-1.0% of Cu powder, 0.5-1.0% of zirconium hafnium alloy powder, and KBF42.5-3.5% of reduced iron powder FHT 100.25 in balance, wherein the mass ratio of zirconium to hafnium in the zirconium hafnium alloy powder is 96: 4, the particle size of the nano chromium nitride powder is 50-120 nm, the particle size of the nano graphene is 30-80 nm, and the particle size of the nano cerium oxide is 40-100 nm.
2. The flux-cored wire matched with bridge steel Q690qE in claim 1, wherein the mass of the flux core accounts for 20-35% of the total mass of the flux-cored wire.
3. The bridge steel Q690qE matched flux-cored wire of claim 1, wherein the flux-cored powder 80-mesh passing rate is 100%.
4. The flux-cored wire matched with bridge steel Q690qE in claim 1, wherein the sheath is a low-carbon cold-rolled steel strip with the width of 8-20 mm and the thickness of 0.25-1.8 mm.
5. The bridge steel Q690qE matched flux-cored wire of any one of claims 1-4, wherein the diameter of the wire is 1.2-4.0 mm.
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| CN111112801A (en) * | 2019-12-20 | 2020-05-08 | 威海东海船舶修造有限公司 | Graphene intervention type welding method |
| CN112453758B (en) * | 2020-10-29 | 2022-04-29 | 西安理工大学 | Welding wire for graphene-enhanced TA1-Q345 middle layer and preparation method |
| CN113523646B (en) * | 2021-07-29 | 2022-08-23 | 合肥工业大学 | Low-dilution-rate surfacing flux-cored wire and preparation method thereof |
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