A flux-cored wire for surfacing wear-resistant alloy on the surface of a wear part

Abstract

The application belongs to the technical field of welding materials, and specifically relates to a flux-cored wire for surfacing wear-resistant alloy on the surface of an easy-wearing part, which comprises an outer skin and a core, the outer skin is prepared from a cold-rolled low-carbon steel strip, and the chemical components and the amount of the core are as follows in percentage by mass: 12.0%-16.0% of surface-modified FHT40.30 reduced iron powder, 4.0%-6.5% of fluorite powder, 5.0%-8.0% of rutile powder, 2.0%-3.6% of potassium carbonate, 2.5%-4.0% of FeTi60-A ferrotitanium, 4.2%-5.5% of FeMn78C medium-carbon ferromanganese, 4.0%-5.0% of GGFeSi93Al silicon iron, 3.5%-4.5% of FeV80-A ferrovanadium, 3.8%-5.0% of FeMo60-A ferromolybdenum, and the balance of FHT100.25 reduced iron powder. The application is uniformly distributed with cubic boron nitride particles of nanometer level in the surfacing alloy, and effectively improves the wear resistance of the surfacing alloy.

Description

Technical Field

[0001] This invention belongs to the field of welding materials technology, specifically relating to a flux-cored welding wire for overlaying wear-resistant alloys on the surface of easily worn parts. Background Technology

[0002] Wear-resistant surfacing technology has become a research hotspot in the field of wear-resistant technology in recent years due to its ease of operation, low cost and high adaptability to working conditions. Surfacing materials mostly use welding rods or welding wires (including solid welding wires and flux-cored welding wires). Flux-cored welding wires have advantages such as the ability to adjust the ratio of flux powder and the simplicity of the preparation process, and their application fields are becoming wider and wider.

[0003] Currently, the flux core formulation of wear-resistant weld overlay wires mainly adds hard phases such as cubic boron nitride. To improve the bonding with the alloy, nano-cubic boron nitride is often used. However, there are problems with using nano-cubic boron nitride as a hard phase to enhance the wear resistance of the weld overlay alloy: due to the nano-size effect, the surface energy of the cubic boron nitride particles is unstable, accumulating a large amount of charge. The coupling of interface atoms and charge transfer leads to significant agglomeration of the nano-cubic boron nitride particles. During the powder mixing process (i.e., uniformly mixing the flux core powder) of the weld overlay wire, the nano-cubic boron nitride particles are difficult to disperse and agglomerate. Furthermore, the weld overlay process involves the movement of a heat source, and the melting and solidification time of the molten pool is short, causing the nano-cubic boron nitride particles in the weld overlay alloy to agglomerate. Ultimately, this results in uneven hardness of the weld overlay alloy and weak bonding between the agglomerated nano-cubic boron nitride and the weld overlay alloy matrix, making it easy for the agglomerated nano-cubic boron nitride to detach from the matrix. Summary of the Invention

[0004] This invention provides a flux-cored welding wire for overlaying wear-resistant alloys onto the surface of easily worn parts. The technical problem it solves is how to make the nano cubic boron nitride particles in the overlay alloy uniformly dispersed.

[0005] The present invention adopts the following technical solution:

[0006] A flux-cored welding wire for overlaying wear-resistant alloys onto the surface of easily worn parts, comprising an outer sheath and a flux core.

[0007] The outer skin is made of cold-rolled low-carbon steel strip with a thickness of 0.5mm-1.0mm.

[0008] The chemical composition and dosage of the core, by mass percentage, are as follows: 12.0%-16.0% of surface-modified FHT40·30 reduced iron powder, 4.0%-6.5% of fluorite powder, 5.0%-8.0% of rutile powder, 2.0%-3.6% of potassium carbonate, 2.5%-4.0% of FeTi60-A ferrotitanium, 4.2%-5.5% of FeMn78C2.0 medium-carbon ferromanganese, 4.0%-5.0% of GGFeSi93Al3.0 ferrosilicon, 3.5%-4.5% of FeV80-A ferrovanadium, 3.8%-5.0% of FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder;

[0009] The surface-modified FHT40·30 reduced iron powder is prepared by modifying the surface of FHT40·30 reduced iron powder with nano-cubic boron nitride, and the preparation method is as follows:

[0010] S1: Mix hydrogen peroxide and concentrated sulfuric acid at a volume ratio of 1:3 to prepare liquid I and transfer it into a three-necked flask;

[0011] S2: Add 10% of the mass of liquid I nano cubic boron nitride to liquid I, stir with a polytetrafluoroethylene magnetic rotor for 15 min to obtain liquid II, wherein the particle size of the nano cubic boron nitride is 50nm-70nm.

[0012] S3: The liquid II obtained in S2 was centrifuged at a centrifugation rate of 10000 rpm for 15 min to obtain solid A. Solid A was ultrasonically dispersed and then washed. It was then dried at 110℃-120℃ for 45 min to obtain nano-cubic boron nitride with hydroxyl groups on the surface.

[0013] S4: Prepare a solution with a volume ratio of H2O to anhydrous ethanol of 1:10, denoted as Liquid III;

[0014] S5: The hydroxyl-modified cubic boron nitride nanoparticles obtained in S3 are placed into liquid III prepared in S4. The volume ratio of the hydroxyl-modified cubic boron nitride nanoparticles to liquid III is 1:10. A stable liquid is formed by ultrasonic dispersion, which is denoted as liquid IV.

[0015] S6: Add a coupling agent with a volume of 1% of the volume of liquid IV to liquid IV obtained in S5, and then add ammonia water with a volume of 7% of the volume of liquid IV. Stir at 20℃-30℃ for 60 min to obtain liquid V. The coupling agent is γ-mercaptopropylmethyldimethoxysilane.

[0016] S7: After centrifuging the liquid V obtained in S6 at a centrifugation rate of 10000 rpm for 15 min, solid B is obtained. Solid B is then ultrasonically dispersed in anhydrous ethanol with the same volume as liquid III to obtain liquid VI.

[0017] S8: Add FHT40·30 reduced iron powder with a mass of 1000% of the mass of the nano cubic boron nitride described in S2 to liquid VI obtained in S7, stir thoroughly for 60 min to obtain liquid VII, wherein the particle size of the FHT40·30 reduced iron powder is 60μm-80μm;

[0018] S9: After centrifuging the liquid VII obtained in S8 at a centrifugal speed of 5000 rpm for 15 min, solid C is obtained. Solid C is the surface-modified FHT40·30 reduced iron powder.

[0019] In this invention, hydroxyl groups are introduced onto the surface of nano-cubic boron nitride through oxidation treatment. The hydroxylated nano-cubic boron nitride couples with thiol groups in the presence of a coupling agent. The thiol groups can coordinate with metallic iron, thereby connecting the nano-cubic boron nitride to the surface of micron-sized reduced iron powder.

[0020] The fluorite powder, rutile powder, potassium carbonate, FeTi60-A ferrotitanium, FeMn78C2.0 medium carbon ferromanganese, GGFeSi93Al3.0 ferrosilicon, FeV80-A ferrovanadium, FeMo60-A ferromolybdenum, and FHT100.25 reduced iron powder have a 100% pass rate at 100 mesh and a 0% pass rate at 300 mesh.

[0021] The flux core filling rate is 30%-38%, meaning the flux core mass accounts for 30%-38% of the total welding wire mass.

[0022] The chemical composition and amount of the core, by mass percentage, are as follows: 14.0% surface-modified FHT40·30 reduced iron powder, 5.2% fluorite powder, 6.5% rutile powder, 2.8% potassium carbonate, 3.2% FeTi60-A ferrotitanium, 4.8% FeMn78C2.0 medium-carbon ferromanganese, 4.5% GGFeSi93Al3.0 ferrosilicon, 4.0% FeV80-A ferrovanadium, 4.4% FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder.

[0023] The diameter of the flux-cored welding wire is 2.4mm-8.0mm, preferably 3.0mm-6.0mm.

[0024] The preparation process of flux-cored welding wire is as follows: batching → powder mixing → bending cold-rolled low-carbon steel strip into a U-shape → adding the mixed flux-cored powder into the U-shaped groove of the steel strip → assembling the U-shaped steel strip into an O-shape → drawing.

[0025] The present invention has the following beneficial technical effects:

[0026] This invention modifies the surface of FHT40·30 reduced iron powder with a particle size of 60μm-80μm onto cubic boron nitride particles with a nanometer-sized particle size (50nm-70nm). During the preparation of flux-cored welding wire, when entering the powder mixing step, the micrometer-sized surface-modified FHT40·30 reduced iron powder particles can be uniformly distributed in the flux-cored powder. During welding, the welding heat source is moving, and the formation and solidification time of the molten pool are short. The FHT40·30 reduced iron powder will melt, but most of the nanometer-sized cubic boron nitride particles will not melt. Because the nanometer-sized cubic boron nitride is uniformly mixed with the micrometer-sized FHT40·30 reduced iron powder in the flux-cored powder, the nanometer-sized cubic boron nitride particles will be uniformly distributed in the solidified alloy, effectively increasing the bonding force with the matrix and significantly improving the wear resistance of the weld alloy. Experiments show that the wear resistance of the weld overlay alloy prepared using the flux-cored welding wire of the present invention is more than 2.3 times that of the weld overlay alloy prepared by adding nano-cubic boron nitride alone.

[0027] The core of this invention lies in modifying nano-cubic boron nitride onto micron-sized FHT40·30 reduced iron powder. This allows for uniform powder mixing during core preparation, and the resulting alloy after welding exhibits a dispersed distribution of nano-cubic boron nitride without agglomeration, resulting in good wear resistance of the weld alloy. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to embodiments and comparative examples. The embodiments and comparative examples listed are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] Example 1:

[0030] A flux-cored welding wire for surface overlay of wear-resistant alloys on easily worn parts includes an outer sheath and a flux core. The chemical composition and amount of the flux core, by mass percentage, are as follows: 14.0% surface-modified FHT40·30 reduced iron powder particles, 5.2% fluorite powder, 6.5% rutile powder, 2.8% potassium carbonate, 3.2% FeTi60-A ferrotitanium, 4.8% FeMn78C2.0 medium-carbon ferromanganese, 4.5% GGFeSi93Al3.0 ferrosilicon, 4.0% FeV80-A ferrovanadium, 4.4% FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder.

[0031] The surface-modified FHT40·30 reduced iron powder is prepared by modifying the surface of FHT40·30 reduced iron powder with nano-cubic boron nitride, and the preparation method is as follows:

[0032] S1: Mix hydrogen peroxide and concentrated sulfuric acid at a volume ratio of 1:3 to prepare liquid I and transfer it into a three-necked flask;

[0033] S2: Add 10% of the mass of liquid I nano cubic boron nitride to liquid I, stir with a polytetrafluoroethylene magnetic rotor for 15 min to obtain liquid II, wherein the particle size of the nano cubic boron nitride is 50nm-70nm.

[0034] S3: The liquid II obtained in S2 was centrifuged at a centrifugation rate of 10000 rpm for 15 min to obtain solid A. Solid A was ultrasonically dispersed and then washed. It was then dried at 110℃-120℃ for 45 min to obtain nano-cubic boron nitride with hydroxyl groups on the surface.

[0035] S4: Prepare a solution with a volume ratio of H2O to anhydrous ethanol of 1:10, denoted as Liquid III;

[0036] S5: The hydroxyl-modified cubic boron nitride nanoparticles obtained in S3 are placed into liquid III prepared in S4. The volume ratio of the hydroxyl-modified cubic boron nitride nanoparticles to liquid III is 1:10. A stable liquid is formed by ultrasonic dispersion, which is denoted as liquid IV.

[0037] S6: Add a coupling agent with a volume of 1% of the volume of liquid IV to liquid IV obtained in S5, and then add ammonia water with a volume of 7% of the volume of liquid IV. Stir at 20℃-30℃ for 60 min to obtain liquid V. The coupling agent is γ-mercaptopropylmethyldimethoxysilane.

[0038] S7: After centrifuging the liquid V obtained in S6 at a centrifugation rate of 10000 rpm for 15 min, solid B is obtained. Solid B is then ultrasonically dispersed in anhydrous ethanol with the same volume as liquid III to obtain liquid VI.

[0039] S8: Add FHT40·30 reduced iron powder with a mass of 1000% of the mass of nano cubic boron nitride described in S2 to liquid VI obtained in S7, stir thoroughly for 60 min to obtain liquid VII, the particle size of FHT40·30 reduced iron powder is 60μm-80μm;

[0040] S9: After centrifuging the liquid VII obtained in S8 at a centrifugal speed of 5000 rpm for 15 min, solid C is obtained. Solid C is the surface-modified FHT40·30 reduced iron powder.

[0041] The 100-mesh passing rate of fluorite powder, rutile powder, potassium carbonate, FeTi60-A ferrotitanium, FeMn78C2.0 medium carbon ferromanganese, GGFeSi93Al3.0 ferrosilicon, FeV80-A ferrovanadium, FeMo60-A ferromolybdenum, and FHT100·25 reduced iron powder is 100%, and the 300-mesh passing rate is 0%.

[0042] The core fill rate is 34%.

[0043] The outer skin is made of cold-rolled low-carbon steel strip with a thickness of 0.8 mm.

[0044] The diameter of the flux-cored welding wire is 4.0 mm.

[0045] The preparation process of flux-cored welding wire is as follows: batching → powder mixing → bending cold-rolled low-carbon steel strip into a U-shape → adding the mixed flux-cored powder into the U-shaped groove of the steel strip → assembling the U-shaped steel strip into an O-shape → drawing.

[0046] Example 2:

[0047] A flux-cored welding wire for surface overlay of wear-resistant alloys on easily worn parts includes an outer sheath and a flux core. The chemical composition and amount of the flux core, by mass percentage, are as follows: 16.0% surface-modified FHT40·30 reduced iron powder particles, 6.5% fluorite powder, 8.0% rutile powder, 3.6% potassium carbonate, 4.0% FeTi60-A ferrotitanium, 5.5% FeMn78C2.0 medium carbon ferromanganese, 5.0% GGFeSi93Al3.0 ferrosilicon, 4.5% FeV80-A ferrovanadium, 5.0% FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder.

[0048] The core fill rate is 38%.

[0049] The preparation method of surface-modified FHT40·30 reduced iron powder particles was carried out according to Example 1.

[0050] The 100-mesh passing rate of fluorite powder, rutile powder, potassium carbonate, FeTi60-A ferrotitanium, FeMn78C2.0 medium carbon ferromanganese, GGFeSi93Al3.0 ferrosilicon, FeV80-A ferrovanadium, FeMo60-A ferromolybdenum, and FHT100·25 reduced iron powder is 100%, and the 300-mesh passing rate is 0%.

[0051] The outer skin is made of cold-rolled low-carbon steel strip with a thickness of 1.0 mm.

[0052] The diameter of the flux-cored welding wire is 8.0 mm.

[0053] The preparation process of flux-cored welding wire is as follows: batching → powder mixing → bending low carbon steel strip into a U-shape → adding the mixed flux-cored powder into the U-shaped groove of the steel strip → assembling the U-shaped steel strip into an O-shape → drawing.

[0054] Example 3:

[0055] A flux-cored welding wire for surface overlay of wear-resistant alloys on easily worn parts, comprising an outer sheath and a flux core, characterized in that the chemical composition and amount of the flux core, by mass percentage, are as follows: 12.0% surface-modified FHT40·30 reduced iron powder particles, 4.0% fluorite powder, 5.0% rutile powder, 2.0% potassium carbonate, 2.5% FeTi60-A ferrotitanium, 4.2% FeMn78C2.0 medium-carbon ferromanganese, 4.0% GGFeSi93Al3.0 ferrosilicon, 3.5% FeV80-A ferrovanadium, 3.8% FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder.

[0056] The core filler rate is 30%.

[0057] The preparation method of surface-modified FHT40·30 reduced iron powder particles was carried out according to Example 1.

[0058] The 100-mesh passing rate of fluorite powder, rutile powder, potassium carbonate, FeTi60-A ferrotitanium, FeMn78C2.0 medium carbon ferromanganese, GGFeSi93Al3.0 ferrosilicon, FeV80-A ferrovanadium, FeMo60-A ferromolybdenum, and FHT100·25 reduced iron powder is 100%, and the 300-mesh passing rate is 0%.

[0059] The outer skin is made of cold-rolled low-carbon steel strip with a thickness of 0.5 mm.

[0060] The diameter of the flux-cored welding wire is 2.4mm.

[0061] The preparation process of flux-cored welding wire is as follows: batching → powder mixing → bending low carbon steel strip into a U-shape → adding the mixed flux-cored powder into the U-shaped groove of the steel strip → assembling the U-shaped steel strip into an O-shape → drawing.

[0062] Comparative Example 1:

[0063] It is basically the same as Example 1, except that the surface-modified FHT40·30 reduced iron powder in the core chemical composition is replaced with an equivalent amount of surface-unmodified FHT40·30 reduced iron powder.

[0064] Comparative Example 2:

[0065] The process is basically the same as in Example 1, except that the surface-modified FHT40·30 reduced iron powder in the core chemical composition is replaced with an equivalent mass of unmodified FHT40·30 reduced iron powder and nano (50nm-70nm) cubic boron nitride powder. (That is, the sum of the masses of unmodified FHT40·30 reduced iron powder and nano (50nm-70nm) cubic boron nitride is equal to the mass of surface-modified FHT40·30 reduced iron powder in Example 1, wherein the mass of unmodified FHT40·30 reduced iron powder is 10 times the mass of nano (50nm-70nm) cubic boron nitride.)

[0066] Comparative Example 3:

[0067] The process is basically the same as in Example 1, except that the surface-modified FHT40·30 reduced iron powder in the core chemical composition is replaced with two powders of corresponding mass: surface-unmodified FHT40·30 reduced iron powder and micron-sized (60μm-80μm) cubic boron nitride. (That is, the sum of the mass of surface-unmodified FHT40·30 reduced iron powder and micron-sized (60μm-80μm) cubic boron nitride is equal to the mass of surface-modified FHT40·30 reduced iron powder in Example 1, wherein the mass of surface-unmodified FHT40·30 reduced iron powder is 10 times the mass of micron-sized (60μm-80μm) cubic boron nitride.)

[0068] The flux-cored welding wires prepared in the examples and comparative examples were deposited on Q235 steel plates. Wear tests were performed on the deposited alloy layers, and the time required for 0.5 mm of wear was measured. Ten experiments were conducted for each example and comparative example, and the average of the ten results was taken. The results are shown in Table 1.

[0069] Table 1

[0070]

[0071] 1) As can be seen from Examples 1-3, the weld overlay formed by the flux-cored welding wire prepared using the technical solution of the present invention has good wear resistance.

[0072] 2) As can be seen from Comparative Examples 1-3:

[0073] ① If the FHT40·30 reduced iron powder in the core is not surface modified, and no nano cubic boron nitride is added to the core powder, then there is no hard phase in the weld overlay alloy, and the wear resistance of the weld overlay alloy is poor.

[0074] ② If the FHT40·30 reduced iron powder in the core is not surface modified, and nano-sized cubic boron nitride is added to the core powder, the nano-sized cubic boron nitride in the weld overlay alloy is prone to agglomeration and uneven distribution. Large agglomerated nano-cubic boron nitride is easy to fall off, resulting in poor wear resistance of the weld overlay alloy.

[0075] ③ If the FHT40·30 reduced iron powder in the core is not surface modified, but micron-sized cubic boron nitride is added to the core powder, the micron-sized cubic boron nitride is not firmly bonded to the matrix alloy and is easy to fall off during the wear process, resulting in poor wear resistance of the weld overlay alloy.

[0076] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the claims. All equivalent changes or modifications made according to the spirit and essence of the present invention should be included within the protection scope of this invention.

Claims

1. A flux-cored welding wire for overlaying wear-resistant alloy onto the surface of easily worn parts, comprising an outer sheath and a flux core, characterized in that, The outer sheath is made of cold-rolled low-carbon steel strip. The chemical composition and amount of the core, by mass percentage, are as follows: surface-modified FHT40·30 reduced iron powder 12.0%-16.0%, fluorite powder 4.0%-6.5%, rutile powder 5.0%-8.0%, potassium carbonate 2.0%-3.6%, FeTi60-A ferrotitanium 2.5%-4.0%, FeMn78C2.0 medium-carbon ferromanganese 4.2%-5.5%, GGFeSi93Al3.0 ferrosilicon 4.0%-5.0%, FeV80-A ferrovanadium 3.5%-4.5%, FeMo60-A ferromolybdenum 3.8%-5.0%, with the balance being FHT100·25 reduced iron powder. The surface-modified FHT40·30 reduced iron powder is reduced iron powder with nano-cubic boron nitride modified on its surface, and its preparation method is as follows: S1: Mix hydrogen peroxide and concentrated sulfuric acid at a volume ratio of 1:3 to prepare liquid I and transfer it into a three-necked flask; S2: Add 10% of the mass of liquid I to liquid I with nano-cubic boron nitride, stir with a polytetrafluoroethylene magnetic rotor for 15 min to obtain liquid II, wherein the particle size of the nano-cubic boron nitride is 50nm-70nm. S3: The liquid II obtained in S2 was centrifuged at a centrifugation rate of 10000 rpm for 15 min to obtain solid A. Solid A was ultrasonically dispersed and then washed. It was then dried at 110℃-120℃ for 45 min to obtain nano-cubic boron nitride with hydroxyl groups on the surface. S4: Prepare a solution with a volume ratio of H2O to anhydrous ethanol of 1:10, denoted as Liquid III; S5: The hydroxyl-modified cubic boron nitride nanoparticles obtained in S3 are placed into liquid III prepared in S4. The volume ratio of the hydroxyl-modified cubic boron nitride nanoparticles to liquid III is 1:

10. A stable liquid is formed by ultrasonic dispersion, which is denoted as liquid IV. S6: Add a coupling agent with a volume of 1% of the volume of liquid IV to liquid IV obtained in S5, and then add ammonia water with a volume of 7% of the volume of liquid IV. Stir at 20℃-30℃ for 60 min to obtain liquid V. The coupling agent is γ-mercaptopropylmethyldimethoxysilane. S7: After centrifuging the liquid V obtained in S6 at a centrifugation rate of 10000 rpm for 15 min, solid B is obtained. Solid B is then ultrasonically dispersed in anhydrous ethanol with the same volume as liquid III to obtain liquid VI. S8: Add FHT40·30 reduced iron powder with a mass of 1000% of the mass of the nano cubic boron nitride described in S2 to liquid VI obtained in S7, stir thoroughly for 60 min to obtain liquid VII, wherein the particle size of the FHT40·30 reduced iron powder is 60μm-80μm; S9: After centrifuging the liquid VII obtained in S8 at a centrifugal speed of 5000 rpm for 15 min, solid C is obtained. Solid C is the surface-modified FHT40·30 reduced iron powder. The fluorite powder, rutile powder, potassium carbonate, FeTi60-A ferrotitanium, FeMn78C2.0 medium-carbon ferromanganese, GGFeSi93Al3.0 ferrosilicon, FeV80-A ferrovanadium, FeMo60-A ferromolybdenum, and FHT100·25 reduced iron powder have a 100% pass rate at 100 mesh and a 0% pass rate at 300 mesh. The filling rate of the core is 30%-38%.

2. The flux-cored welding wire for overlaying wear-resistant alloys onto the surface of easily worn parts according to claim 1, comprising an outer sheath and a flux core, characterized in that, The chemical composition and amount of the core, by mass percentage, are as follows: 14.0% surface-modified FHT40·30 reduced iron powder, 5.2% fluorite powder, 6.5% rutile powder, 2.8% potassium carbonate, 3.2% FeTi60-A ferrotitanium, 4.8% FeMn78C2.0 medium-carbon ferromanganese, 4.5% GGFeSi93Al3.0 ferrosilicon, 4.0% FeV80-A ferrovanadium, 4.4% FeMo60-A ferromolybdenum, with the balance being FHT100·25 reduced iron powder.

3. The flux-cored welding wire for overlaying wear-resistant alloy onto the surface of easily worn parts according to claim 1, characterized in that, The thickness of the cold-rolled low-carbon steel strip is 0.5mm-1.0mm.

4. The flux-cored welding wire for overlaying wear-resistant alloy onto the surface of easily worn parts according to claim 1, characterized in that, The diameter of the flux-cored welding wire is 2.4mm-8.0mm.

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