CN112643244A - Self-protection flux-cored wire and preparation method thereof - Google Patents
Self-protection flux-cored wire and preparation method thereof Download PDFInfo
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- CN112643244A CN112643244A CN202011380661.3A CN202011380661A CN112643244A CN 112643244 A CN112643244 A CN 112643244A CN 202011380661 A CN202011380661 A CN 202011380661A CN 112643244 A CN112643244 A CN 112643244A
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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
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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Abstract
The invention provides a self-protection flux-cored wire which comprises a steel strip and a flux core, wherein the flux core is filled in the steel strip, and the flux core comprises the following raw material components in percentage by mass: 50-70% of high-carbon ferrochrome, 2-10% of ferrosilicon, 2-10% of ferromanganese, 2-10% of aluminum-magnesium alloy, 2-10% of ferrotitanium, 2-10% of ferroboron, 5-15% of graphite and 1-2% of ferromolybdenum. The self-shielded flux-cored wire does not need shielding gas or flux during welding, does not have slag after welding, can continuously carry out multilayer surfacing without slag removal, and has the advantages of excellent surfacing layer performance, good welding process and high hardness of a wear-resistant layer formed by welding. The invention also provides a preparation method of the self-protection flux-cored wire.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a self-protection flux-cored wire and a preparation method thereof.
Background
The roller press is a common cement energy-saving grinding device in cement production, and is mainly used for extruding raw materials and clinker. The extrusion roller of the roll squeezer bears huge pressure when in service, and can be worn by materials, and the surface of the extrusion roller can be seriously damaged after long-term use. Because the manufacturing cost of the roller press is high, the replacing time of the squeeze roller is long, and huge economic loss can be caused to enterprises every time of replacement. At present, to the wearing and tearing problem of roll squeezer squeeze roller, mainly carry out the resurfacing through the build-up welding, can make impaired squeeze roller normal use once more, reduce the change number of times of squeeze roller, improve the utilization ratio of machine itself, saved the expense that the enterprise bought new installation, reduced the comprehensive cost of enterprise.
With the continuous development and progress of scientific technology, the application field of the hardfacing technology is gradually expanding as an effective measure for protecting the surface of the material, and the technology is quite mature in many easily-worn fields. However, the weld metal formed by the flux-cored wire used for surfacing repair at present has poor wear resistance and crack resistance, so that the repaired part has low quality and short service life.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a self-protection flux-cored wire which is used for solving the problem that the quality of repaired parts is not high due to poor wear resistance and poor crack resistance of weld metal.
In order to achieve the above and other related objects, the present invention provides a self-shielded flux-cored wire, comprising a steel strip and a flux core, wherein the flux core is filled in the steel strip, and the flux core comprises the following raw material components by mass:
in an embodiment of the present invention, the carbon content of the high carbon ferrochrome is 8-10 wt%, and the chromium content is 66-70 wt%; the silicon content of the ferrosilicon is 72-80 wt%; the manganese content of the ferromanganese is 78-85 wt%; the aluminum magnesium alloy contains 47-50 wt% of magnesium (Mg) and 50-53 wt% of aluminum (Al); the titanium (Ti) content of the ferrotitanium is 25-35 wt%, and the silicon (Si) content of the ferrotitanium is 3-5 wt%; the boron (B) content of the ferroboron is 19-25 wt%; the molybdenum (Mo) content of the ferromolybdenum is 55-65 wt%.
In one embodiment of the present invention, the particle size of each component in the drug core is 60 to 100 mesh.
In an embodiment of the invention, a filling rate of the flux core in the flux-cored wire is 40-50%.
In an embodiment of the present invention, the steel strip is a low carbon steel strip, and the low carbon steel strip includes the following components by mass: the carbon (C) content is less than or equal to 0.08 percent, the manganese (Mn) content is less than or equal to 0.40 percent, the phosphorus (P) content is less than or equal to 0.025 percent, the sulfur (S) content is less than or equal to 0.020 percent, and the balance is iron (Fe).
In an embodiment of the present invention, the diameter of the flux-cored wire is 2.8 to 4.0 millimeters (mm).
The invention provides a preparation method of a self-shielded flux-cored wire, which comprises the following steps:
high-carbon ferrochrome, ferrosilicon, ferromanganese, aluminum-magnesium alloy, ferrotitanium, ferroboron, graphite and ferromolybdenum are respectively proportioned according to the mass percentages of 50-70%, 2-10%, 5-15% and 1-2%, and the proportioned medicinal powder is dried;
adding the dried medicinal powder into a powder mixing machine, and uniformly stirring and mixing;
rolling the steel strip into a U-shaped steel strip;
filling the uniformly mixed medicinal powder into the U-shaped steel belt;
and closing the U-shaped steel belt filled with the medicinal powder to wrap the medicinal powder, and drawing to the specified diameter of the prepared flux-cored wire.
In the embodiment of the invention, all the components in the medicinal powder are powder, and the particle size of each component in the medicinal powder is 60-100 meshes.
In an embodiment of the present invention, the stirring time of the powder in the powder mixing machine is greater than or equal to 3 hours.
In an embodiment of the invention, the steel strip is cleaned before being rolled into a U-shaped steel strip, so that the surface of the steel strip is free of oil, water and rust.
In an embodiment of the present invention, the steel strip is cleaned before being rolled into a U-shaped steel strip.
The flux core of the self-protection flux-cored wire has the following functions:
high-carbon ferrochrome: the transition alloy element chromium (Cr) in the overlay welding metal interacts with elements such as C, B to generate a hard phase, the wear resistance of the overlay welding layer is improved, and the high-carbon ferrochrome also provides elements C, wherein one part of C plays a role in deoxidation, and the other part of C is transited into the deposited metal and is combined with a strong carbide forming element to form the hard phase.
Silicon iron: deoxidizing, reducing the surface tension of molten drops and improving the fluidity of a molten pool.
Ferromanganese: deoxidizing and reducing the oxygen content in the welding seam; meanwhile, the transition alloy elements in the deposited metal improve the strength and hardness of the deposited metal.
Aluminum magnesium alloy: the deoxidizer is mainly used for deoxidizing and fixing nitrogen, and enhances the electric conductivity of the electric arc.
Titanium iron: deoxidizing and reducing the oxygen content in the welding seam.
B, iron and boron: under the high temperature action of the electric arc, Si and B in the alloy have strong affinity with oxygen, and strong oxidation-reduction reaction occurs in molten drops or molten pools, and oxidation products are silicon oxide and boron oxide. These two oxidation products undergo complex reactions with other oxidation products to form low melting borosilicate glassy complex compounds. The composite compound coats the metal molten drop to protect the molten drop from transition, and floats to the surface to form a layer of extremely thin uniform protective film on the strong stirring of a molten pool, so that air infiltration is prevented, the welding seam metal is protected from being polluted, and the existence of a glassy film is beneficial to improving the surface quality of a welding bead.
Graphite: deoxidizing and supplying element C to the molten pool.
Ferromolybdenum: the alloy element molybdenum (Mo) is transited into the surfacing metal, and the Mo and the C element react to form a carbide hard phase, so that the hardness of the surfacing metal is further improved.
As described above, the self-shielded flux-cored wire provided by the invention has the advantages that the surfacing layer formed by the flux-cored wire after welding has excellent performance and a better welding process, the wear-resistant layer formed by welding has high hardness and good wear resistance, and has higher crack resistance, and the phenomenon that the wear-resistant layer is chipped or abraded due to cracks in the using process is reduced; in addition, the flux core of the invention is not added with mineral powder, no slag is left after welding, and continuous surfacing can be carried out without slag removal in the surfacing process, so that the cladding speed is greatly improved, the advantage is in accordance with the internal requirement of large-scale equipment, and a new way is provided for efficient and automatic surfacing repair of the large-scale equipment.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 shows a flow chart of a method for preparing the self-shielded flux-cored wire of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and the description of the present invention, and any methods, apparatuses, and materials similar or equivalent to those described in the examples of the present invention may be used to practice the present invention.
Note that "wt%" described herein means "mass percentage" unless otherwise specified.
The invention provides a self-protection flux-cored wire which comprises a steel strip and a flux core, wherein the flux core is filled in the steel strip, and the flux core comprises the following raw material components in percentage by mass: 50-70% of high-carbon ferrochrome, 2-10% of ferrosilicon, 2-10% of ferromanganese, 2-10% of aluminum-magnesium alloy, 2-10% of ferrotitanium, 2-10% of ferroboron, 5-15% of graphite and 1-2% of ferromolybdenum.
Referring to fig. 1, the invention also provides a preparation method of the self-shielded flux-cored wire, which comprises the following steps:
s1, mixing high-carbon ferrochrome, ferrosilicon, ferromanganese, aluminum-magnesium alloy, ferrotitanium, ferroboron, graphite and ferromolybdenum according to the mass percentages of 50-70%, 2-10%, 5-15% and 1-2% respectively to form medicinal powder, and drying the medicinal powder;
s2, adding the dried medicinal powder into a powder mixing machine, and uniformly stirring and mixing;
s3, rolling the steel strip into a U-shaped steel strip;
s4, filling the uniformly mixed medicinal powder into the U-shaped steel strip;
and S5, closing the U-shaped steel strip filled with the medicinal powder to wrap the medicinal powder, and drawing to the diameter of the prepared flux-cored wire.
Specifically, the carbon content of the high-carbon ferrochrome used in the step S1 is 8-10 wt%, and the chromium content is 66-70 wt%; the silicon content of the ferrosilicon is 72-80 wt%; the manganese content of the ferromanganese is 78-85 wt%; the magnesium content in the aluminum-magnesium alloy is 47-50 wt%, and the aluminum content is 50-53 wt%; the titanium content of the ferrotitanium is 25-35 wt%, and the silicon content is 3-5 wt%; the boron content of ferroboron is 19-25 wt%; the molybdenum content of the ferromolybdenum is 55-65 wt%. The components are all powder, and the particle size of the powder is 60-100 meshes.
Specifically, the time for stirring and mixing the medicinal powder in the step S2 in the mixing machine is greater than or equal to 3 hours.
Specifically, the steel strip in the step S3 is a low-carbon steel strip, and the low-carbon steel strip comprises the following components in percentage by mass: less than or equal to 0.08 percent of C, less than or equal to 0.40 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S and the balance of iron. The steel strip can be rolled into a U-shaped steel strip by using a forming roller, and the steel strip is cleaned before being rolled into the U-shaped steel strip, so that the surface of the steel strip is free of oil, water and rust. The U-shaped steel belt is a steel belt with a U-shaped cross section (the steel belt is provided with a U-shaped groove).
Specifically, in step S4, the U-shaped steel strip is filled with the uniformly mixed powder, and the powder can be fed into the U-shaped groove of the U-shaped steel strip by the powder feeding device. Wherein the filling rate of the powder (the weight of the powder/the total weight of the flux-cored wire) is 40-50%.
Specifically, in step S5, the U-shaped steel strip filled with the powder is closed to wrap the powder in the steel strip, and then the U-shaped steel strip is drawn and reduced one by one through a wire drawing die to reach a diameter of 2.8 to 4.0mm, for example, a welding wire can be drawn to a diameter of 2.8mm, 3.2mm, or 4.0mm, to obtain a final product.
The present invention will be described in detail with reference to the following examples.
The U-shaped steel belts used in the following examples are all low carbon steel belts.
Referring to the data in table 1, in an embodiment, the flux core of the self-shielded flux-cored wire is prepared by the following components by mass percent: 50% of high-carbon ferrochrome, 5% of ferrosilicon, 5% of ferromanganese, 10% of aluminum-magnesium alloy, 8% of ferrotitanium, 6% of ferroboron, 15% of graphite and 1% of ferromolybdenum, all the obtained component powders pass through a sieve of 80 meshes, and the prepared medicinal powder is dried. And (3) feeding the dried medicinal powder into a powder mixing machine, stirring and mixing for 3 hours, and feeding the medicinal powder into a U-shaped steel belt through a powder feeding device after uniformly stirring, wherein the filling rate of the medicinal powder is 40%. And closing the U-shaped groove, wrapping the powder in the U-shaped groove, and drawing the powder one by one through a wire drawing die to form a 3.2mm welding wire A.
And carrying out automatic welding test on the welding wire A by using a special welding machine, wherein the welding voltage adopted by welding is 30-32V, and the welding current is 270-300A. The electric arc is stable in the welding process, less smoke and dust exist, no slag exists after welding, and the surface of the welding seam is glossy.
And (3) repeatedly overlaying three layers, controlling the interlayer temperature of each layer to be 150 ℃, and polishing the surface after welding. Hardness is measured by using a Rockwell hardness tester, five points at different positions are taken for testing, and the measured hardness values are HRC 58/58/62/60/59 respectively.
Referring to the data in table 1, in another embodiment, the flux core of the self-shielded flux-cored wire is prepared by the following components by mass percent: 60% of high-carbon ferrochrome, 2% of ferrosilicon, 10% of ferromanganese, 8% of aluminum-magnesium alloy, 2% of ferrotitanium, 10% of ferroboron, 6% of graphite and 2% of ferromolybdenum, passing the powder of each component through a 60-mesh sieve, and drying the prepared medicinal powder. And (3) feeding the dried medicinal powder into a powder mixing machine, stirring and mixing for 3 hours, and feeding the medicinal powder into a U-shaped steel belt through a powder feeding device after uniformly stirring, wherein the filling rate of the medicinal powder is 45%. And closing the U-shaped groove, wrapping the powder in the U-shaped groove, and drawing the powder one by one through a wire drawing die to form a 3.2mm welding wire B.
And carrying out automatic welding test on the welding wire B by using a special welding machine, wherein the welding voltage adopted by welding is 30-32V, and the welding current is 270-300A. The electric arc is stable in the welding process, less smoke and dust exist, no slag exists after welding, and the surface of the welding seam is glossy.
And (3) repeatedly overlaying three layers, controlling the interlayer temperature of each layer to be 150 ℃, and polishing the surface after welding. Hardness is measured by using a Rockwell hardness tester, five points at different positions are taken for testing, and the measured hardness values are HRC 62/63/62/60/61 respectively.
Referring to the data in table 1, in another embodiment, the flux core of the self-shielded flux-cored wire is prepared by the following components by mass percent: 70 percent of high-carbon ferrochrome, 10 percent of ferrosilicon, 2 percent of ferromanganese, 2 percent of aluminum-magnesium alloy, 5 percent of ferrotitanium, 2 percent of ferroboron, 8 percent of graphite and 1 percent of ferromolybdenum, all the obtained component powder passes through a 100-mesh sieve, and the prepared medicinal powder is dried. And (3) feeding the dried medicinal powder into a powder mixing machine, stirring and mixing for 3 hours, and feeding the medicinal powder into a U-shaped steel belt through a powder feeding device after uniformly stirring, wherein the filling rate of the medicinal powder is 50%. And closing the U-shaped groove, wrapping the powder in the U-shaped groove, and drawing the powder one by one through a wire drawing die to form a 3.2mm welding wire C.
And carrying out automatic welding test on the welding wire C by using a special welding machine, wherein the welding voltage adopted by welding is 30-32V, and the welding current is 270-300A. The electric arc is stable in the welding process, less smoke and dust exist, no slag exists after welding, and the surface of the welding seam is glossy.
And (3) repeatedly overlaying three layers, controlling the interlayer temperature of each layer to be 150 ℃, and polishing the surface after welding. Hardness is measured by using a Rockwell hardness tester, five points at different positions are taken for testing, and the measured hardness values are HRC 58/58/60/59/58 respectively.
Table 1 shows the formulation and performance testing of the flux core components of the self-shielded flux cored wire in some of the examples listed
In conclusion, the invention provides the self-protection flux-cored wire which has stable electric arc, less smoke dust, no slag on the surface of a welding seam, luster, high welding efficiency and good welding quality in the welding process and can realize continuous operation. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.
The foregoing embodiments are merely illustrative of the principles of this invention and its efficacy, rather than limiting it, and various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. The self-protection flux-cored wire comprises a steel strip and a flux core, wherein the flux core is filled in the steel strip, and is characterized in that the flux core comprises the following raw material components in percentage by mass:
2. the self-shielded flux-cored wire of claim 1, wherein the high-carbon ferrochrome has a carbon content of 8 to 10 wt% and a chromium content of 66 to 70 wt%; the silicon content of the ferrosilicon is 72-80 wt%; the manganese content of the ferromanganese is 78-85 wt%; the magnesium content in the aluminum-magnesium alloy is 47-50 wt%, and the aluminum content is 50-53 wt%; the titanium content of the ferrotitanium is 25-35 wt%, and the silicon content is 3-5 wt%; the boron content of the ferroboron is 19-25 wt%; the molybdenum content of the ferromolybdenum is 55-65 wt%.
3. The self-shielded flux-cored wire of claim 1, wherein the particle size of each component in the core is 60 to 100 mesh.
4. The self-shielded flux-cored welding wire of claim 1, wherein a filling ratio of the core in the flux-cored welding wire is 40-50%.
5. The self-shielded flux-cored wire of claim 1, wherein the steel strip is a low carbon steel strip comprising the following components in mass percent: the carbon content is less than or equal to 0.08 percent, the manganese content is less than or equal to 0.40 percent, the phosphorus content is less than or equal to 0.025 percent, the sulfur content is less than or equal to 0.020 percent, and the balance is iron.
6. The self-shielded flux-cored welding wire of claim 1, wherein the diameter of the flux-cored welding wire is 2.8 to 4.0 mm.
7. A method of making the self-shielded flux-cored welding wire of any one of claims 1 to 6, comprising the steps of:
high-carbon ferrochrome, ferrosilicon, ferromanganese, aluminum-magnesium alloy, ferrotitanium, ferroboron, graphite and ferromolybdenum are respectively proportioned according to the mass percentages of 50-70%, 2-10%, 5-15% and 1-2%, and the proportioned medicinal powder is dried;
adding the dried medicinal powder into a powder mixing machine, and uniformly stirring and mixing;
rolling the steel strip into a U-shaped steel strip;
filling the uniformly mixed medicinal powder into the U-shaped steel belt;
and closing the U-shaped steel belt filled with the medicinal powder to wrap the medicinal powder, and drawing to the diameter of the prepared flux-cored wire.
8. The method of preparing a self-shielded flux-cored wire of claim 7, wherein each component of the powder is in a powder form, and the particle size of each component of the powder is 60-100 mesh.
9. The method of making a self-shielded flux-cored welding wire of claim 7, wherein the powder is stirred in the powder mixer for a time period of 3 hours or more.
10. The method of manufacturing a self-shielded flux-cored wire of claim 7, wherein the steel strip is cleaned before being rolled into a U-shaped steel strip.
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| CN115922143A (en) * | 2022-12-09 | 2023-04-07 | 山东聚力焊接材料有限公司 | Flux-cored wire for backing BD roller repair and preparation method thereof |
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| CN115609188A (en) * | 2022-11-11 | 2023-01-17 | 山东聚力焊接材料有限公司 | Surfacing flux-cored wire and preparation method and welding method thereof |
| CN115846932A (en) * | 2022-11-23 | 2023-03-28 | 山东聚力焊接材料有限公司 | Surfacing flux-cored wire and preparation method and application thereof |
| CN115922143A (en) * | 2022-12-09 | 2023-04-07 | 山东聚力焊接材料有限公司 | Flux-cored wire for backing BD roller repair and preparation method thereof |
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| CN112643244B (en) | 2023-02-14 |
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Denomination of invention: A self-protection flux cored welding wire and its preparation method Effective date of registration: 20230925 Granted publication date: 20230214 Pledgee: Qilu bank Limited by Share Ltd. Dezhou branch Pledgor: Shandong Juli Welding Material Co.,Ltd. Registration number: Y2023980058626 |