CN113118664B - Gas-shielded metal-cored welding wire for wear-resistant surfacing repair containing rare earth and preparation method thereof - Google Patents

Gas-shielded metal-cored welding wire for wear-resistant surfacing repair containing rare earth and preparation method thereof Download PDF

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CN113118664B
CN113118664B CN202110263420.9A CN202110263420A CN113118664B CN 113118664 B CN113118664 B CN 113118664B CN 202110263420 A CN202110263420 A CN 202110263420A CN 113118664 B CN113118664 B CN 113118664B
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welding wire
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CN113118664A (en
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张天理
王伟光
武雯
陈浩欣
葛丽
葛坤
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Shanghai University of Engineering Science
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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
    • 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
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods

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Abstract

The invention relates to a gas-shielded metal-cored welding wire for hardfacing repair and a preparation method thereof, wherein the metal-cored welding wire comprises a flux core and a stainless steel strip containing rare earth, and the flux core comprises the following components in percentage by mass: 70-82% of high-carbon ferrochrome, 1-8% of ferrovanadium, 4-8% of 75# ferrosilicon, 5-11% of manganese metal, 1-3% of aluminum-magnesium alloy, 1-4% of ferroboron, 2-5% of ferrotitanium, 2-3% of ferromolybdenum, 1-2% of ferrozirconium and the balance of ferroniobium; the rare earth elements in the stainless steel band containing rare earth are more than one of Ce, sc and Er; the preparation method of the metal-core welding wire comprises the steps of heating a flux core to obtain metal powder, and then preparing the metal-core welding wire; the metal-cored welding wire has good arc stability and no crack after welding, the relative wear coefficient of a surfacing layer is 1.25-1.36, the hardness of the surfacing layer is more than 60HRC, the low-temperature impact toughness at-40 ℃ is more than 50J/cm, and the crack index of the surfacing layer is less than 2.5; the weld has high hardness and good wear resistance, while a certain amount of retained austenite gives it some toughness.

Description

Gas-shielded metal-cored welding wire for wear-resistant surfacing repair containing rare earth and preparation method thereof
Technical Field
The invention belongs to the technical field of welding, and relates to a gas-shielded metal-cored welding wire for wear-resistant surfacing repair of rare earth-containing steel belts and a preparation method thereof.
Background
At present, in mines, building materials and electric power industries in China, about 80 million tons of steel are lost due to abrasion every year, the abrasion resistance of the material is improved, and the abrasion is reduced, which is an important task expected to be solved by production departments.
The excavator bucket used for a long time under the abrasion of the chiseling type abrasive material has more damages with different degrees, and has larger economic benefit compared with a replacement component for surfacing repair, but the steel for the excavator bucket has poorer weldability, the carbon content of a welding seam is higher, carbon atoms are easily gathered in a crystal boundary to form carbide, the loose carbide can be distributed along a crystal network, the size of the crystal grain can be thicker, and the low-temperature toughness of a coarse crystal area is sharply reduced, so that the coarse crystal area is locally embrittled.
The existing flux-cored wire promotes acicular ferrite to generate by adding chromium and titanium elements so as to improve the toughness, but upper bainite is easily generated in the welding process, ferrite and martensite-austenite (M-A) components are eutectoid firstly, carbides are easily generated at the crystal boundary, so that the toughness of a welding joint is low, cracks are easily generated in a surfacing layer, and the problems of low metal toughness and crack sensitivity of the welding seam at present are not effectively solved.
Therefore, it is very important to research a scheme capable of effectively solving the problems of low toughness and easy generation of cracks in the overlay welding layer.
Disclosure of Invention
In order to solve the problem that the low-temperature toughness of a coarse crystal region is sharply reduced in surfacing repair in the prior art, and further the hardness, wear resistance and toughness of a surfacing layer are insufficient due to local embrittlement of the coarse crystal region, the invention provides a gas-shielded metal-cored welding wire for hardfacing repair and a preparation method thereof. The high-chromium cast iron type surfacing metal core welding wire is prepared from a rare earth-containing steel strip, the surfacing metal surface has high hardness and high wear resistance, and a certain toughness is considered, so that the rapid reduction of the low-temperature toughness of a coarse crystal region can be improved, and the local embrittlement of the coarse crystal region can be further improved. The welding wire surfacing repaired component can be used under the condition of high-stress grinding type abrasive wear, the welding seam structure of the welding wire surfacing repaired component is hidden needle martensite, residual austenite, and (Ti, V) C phase, (Zr, V) C phase, (Nb, V) C phase which are distributed in parallel in crystal, strong carbides are adopted to form elements such as titanium, niobium and zirconium, and medium-strong carbides such as molybdenum, chromium and manganese, so that the concentration of carbon atoms at a crystal boundary is balanced and is not enough to form the carbides, the precipitation of the carbides along the crystal is inhibited, the phenomenon that the surfacing layer is embrittled due to the generation of the carbides at the crystal boundary is avoided, the low-temperature toughness of a coarse crystal region is sharply reduced, and then the coarse crystal region is locally embrittled, the (Ti, V) C phase, (Zr, V) C phase, (Nb, V) C phase is further refined through rare earth elements, the distribution uniformity of the hard phases is increased, and the wear resistance and hardness of surfacing metal are improved. The hardness of the surfacing metal formed by welding of the invention reaches more than 60HRC, the-40 ℃ impact toughness reaches more than 50J/cm, wherein, martensite and acicular carbide enable the welding seam to have high hardness and good wear resistance, a certain amount of residual austenite enables the welding seam to have certain toughness, rare earth elements further refine (Ti, V) C phase, (Zr, V) C phase, (Nb, V) C phase and increase the distribution uniformity of hard phase, the wear resistance and hardness of the surfacing metal are further improved, and the service life is increased by 30%.
In order to achieve the purpose, the invention adopts the following scheme:
a gas-shielded metal core welding wire for hardfacing repair comprises a flux core and a stainless steel strip containing rare earth;
the medicine core comprises the following components in percentage by mass: 70-82% of high-carbon ferrochrome, 1-8% of ferrovanadium, 4-8% of 75# ferrosilicon, 5-11% of manganese metal, 1-3% of aluminum-magnesium alloy, 1-4% of ferroboron, 2-5% of ferrotitanium, 2-3% of ferromolybdenum, 1-2% of ferrozirconium and the balance of ferroniobium;
the rare earth element in the stainless steel band containing rare earth is more than one of Ce, sc and Er. RE elements are transited into metal, a hard phase is refined, and the uniformity of the hard phase is increased.
As a preferred technical scheme:
the gas-shielded metal-cored welding wire for hardfacing repair comprises a rare earth-containing stainless steel strip, wherein the mass content of rare earth elements is 0.5-2.5%, and the mass content of chromium is 16-18% (mass fraction).
The gas-shielded metal-cored welding wire for hardfacing repair has the advantages that the width of the stainless steel strip containing rare earth is 10-12 mm, and the thickness of the stainless steel strip is 0.6-0.8 mm.
According to the gas-shielded metal-cored welding wire for hardfacing repair, the filling rate of the flux core in the metal-cored welding wire is 24% -25%.
According to the gas-shielded metal-cored welding wire for hardfacing repair, in the high-carbon ferrochrome, the content of Cr is 64%, the content of C is 9% -10%, the content of Si is 3%, and the balance is Fe; the Cr element can inhibit austenite grains from coarsening and can form carbide with C under a certain condition, and the increase of the carbide can improve the hardness and the wear resistance of the overlaying layer;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe; the alloy element V is transited into the metal, the element V can obviously refine the crystal grains of the high-chromium cast iron structure, has large strengthening and toughening effects, and improves the crack resistance and the wear resistance of the surfacing layer;
75# ferrosilicon: si content of 74.0-80.0%, C content of 0.1%, and the balance Fe; the alloy element Si is transited into the metal, and the effect of deoxidation is mainly achieved;
the metal manganese is used for transferring an alloy element Mn into metal and mainly plays a role in deoxidation;
the aluminum magnesium alloy is aluminum: an alloy powder of 3:2 for magnesium; the function of the catalyst is deoxidation and denitrification;
in ferroboron, the content of B is 17-19%, the content of C is 0.5%, the content of Si is 4%, the content of Al is 0.5%, and the balance is Fe; the alloy element B is transited into the metal to form hard phase boride, so that the hardness of the surfacing layer is improved;
in the ferrotitanium, the content of Ti is 25-35%, the content of Al is 8.5%, the content of Si is 5%, the content of Mn is 2.5%, and the balance is Fe; the alloy element Ti is transited into the metal, and the Ti element can refine grains, improve the toughness of a weld joint structure, and perform deoxidation and denitrification;
in the ferrocolumbium, the Nb content is 70%, the C content is 0.5%, the Si content is 2%, the Al content is 0.8%, and the balance is Fe. Transition of alloying element Nb into the metal;
in the ferromolybdenum, the Mo content is 55-56%, the Si content is 1%, the C content is 0.1%, and the balance is Fe; transition of the alloying element Mo into the metal; mo has stronger carbide forming ability, so that the overlaying layer with lower carbon content also has higher hardness, and the molybdenum can prevent the coarsening of austenitized crystal grains.
In the ferrozirconium, the Zr content is 52-54%, the Si content is 23-27%, the Al content is 5-7%, and the balance is Fe. And (3) transferring an alloy element Zr into the metal. Zr element can deoxidize and denitrify, and the austenite grains of the overlaying layer are refined.
The gas-shielded metal-cored welding wire for the hardfacing repair has the advantages that the metal-cored welding wire has no cracks after being welded, the relative wear coefficient of a surfacing layer is 1.25-1.36, the wear resistance is improved, the hardness of the surfacing layer is more than 60HRC, the low-temperature impact toughness at-40 ℃ is more than 50J, the crack index (pcm) of the surfacing layer is less than 2.5, and the gas-shielded metal-cored welding wire has no cold crack tendency.
The method for repairing the gas-shielded metal core welding wire by the hardfacing comprises the following steps of firstly taking high-carbon ferrochrome, ferrovanadium and 75 percent of vanadium according to the mass percentage of all components in a flux core # Ferrosilicon, metal manganese, aluminum-magnesium alloy, ferroboron, ferrotitanium, ferromolybdenum, ferrozirconium and ferroniobium are stirred at a constant speed in a constant-temperature stirrer, are uniformly mixed and are heated to obtain metal powder; and rolling the metal powder and the stainless steel band containing rare earth into thick wires (the specification is phi 2.5), and drawing and reducing the diameter of the thick wires to prepare the metal-core welding wires (the specification is phi 1.6). And winding the prepared welding wire into a disc according to the spring width of 750mm and the spring height of +/-1 mm by using a layer winding machine, and sealing and packaging for later use.
As a preferred technical scheme:
according to the preparation method of the gas-shielded metal core welding wire for hardfacing repair, the heating temperature is 200-300 ℃, and the time is 2-3 h; when drawing and reducing, the diameter is reduced by 0.1mm each time.
The mechanism of the invention is as follows:
the gamma-Fe phase is precipitated from the overlaying layer and then grows up, wherein strong carbide forming elements such as titanium, niobium and zirconium are combined with carbon to form TiC, zrC, nbC and the like, then vanadium and the carbon grow up by taking the phases as cores to form (Ti, V) C phase, (Zr, V) C phase and (Nb, V) C phase which are distributed in parallel in crystal, so that a plurality of tiny areas containing different carbon are formed in austenite, the tiny areas are converted into hidden pin martensite at different temperatures and different periods, the hidden pin martensite and the dispersed (Ti, V) C phase (Zr, V) C phase (Nb, V) C phase are mixed into a bulk structure, the strength and the toughness are improved, wherein the medium-strength carbide forming elements such as Mo, cr and Mn are positioned in austenite crystal boundaries, so that the carbon atom concentration at the crystal boundaries is balanced, carbide is not enough to form, the precipitation of carbide along the crystal carbides is inhibited, and the carbide at the crystal boundaries is prevented from generating to cause embrittlement of the overlaying layer.
The rare earth elements in the overlaying layer enable inclusions to be refined and spheroidized, size fluctuation of the inclusions is reduced, the inclusions are dispersed in the overlaying layer, the size reduction of austenite grains tends to be uniform, and strength and toughness are improved. The addition of rare earth elements inhibits the formation of proeutectoid ferrite and upper bainite, promotes the formation of acicular ferrite, thereby refining grains, improving strength and toughness and improving crack sensitivity. The addition of multiple rare earth elements improves the hydrogen capturing capacity, and reduces the content of hydrogen elements in the surfacing layer, thereby further reducing the sensitivity of cracks.
Advantageous effects
(1) The gas-shielded metal-cored welding wire for hardfacing repair has good arc stability, no cracks after welding, good wear resistance of a surfacing layer, hardness of more than 60HRC, and good low-temperature impact toughness, wherein the low-temperature impact toughness at-40 ℃ can be more than 50J/cm;
(2) The gas-shielded metal-cored welding wire for hardfacing repair has a welding seam structure comprising hidden needle martensite, residual austenite, and (Ti, V) C phases, (Zr, V) C phases and (Nb, V) C phases which are distributed in parallel in crystal; the martensite, the (Ti, V) C phase, the (Zr, V) C phase and the (Nb, V) C phase enable the welding seam to have high hardness and good wear resistance, and a certain amount of residual austenite enables the welding seam to have certain toughness;
(3) According to the gas-shielded metal core welding wire for hardfacing repair, the (Ti, V) C phase, (Zr, V) C phase and (Nb, V) C phase are further refined through rare earth elements, the distribution uniformity of the hard phase is increased, the wear resistance and hardness of the hardfacing metal are further improved, and the service life is longer.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A preparation method of a gas-shielded metal-cored welding wire for hardfacing repair comprises the following specific steps:
(1) Preparing raw materials of metal powder, wherein the raw materials comprise the following components in percentage by mass:
70% of high-carbon ferrochrome, 2% of ferrovanadium, 8% of 75# ferrosilicon, 9% of manganese metal, 1% of aluminum-magnesium alloy, 1% of ferroboron, 4% of ferrotitanium, 2% of ferromolybdenum, 1% of ferrozirconium and the balance of ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9.5 percent, the content of Si is 3 percent, and the balance is Fe;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe;
in 75# ferrosilicon, the Si content is 74%, the C content is 0.1%, and the balance is Fe;
the aluminum magnesium alloy is aluminum: an alloy powder of 3:2 for magnesium;
in the ferroboron, the content of B is 18 percent, the content of C is 0.5 percent, the content of Si is 4 percent, the content of Al is 0.5 percent, and the balance is Fe;
in the ferrotitanium, the content of Ti is 25 percent, the content of Al is 8.5 percent, the content of Si is 5 percent, the content of Mn is 2.5 percent, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the Mo content is 56%, the Si content is 1%, the C content is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 53 percent, the Si content is 23 percent, the Al content is 5 percent, and the balance is Fe;
(2) Uniformly mixing the raw materials in the step (1) according to the mass percentage, and heating at 200 ℃ for 3 hours to obtain metal powder;
(3) Rolling the metal powder and a rare earth-containing stainless steel band with the width of 10mm and the thickness of 0.6mm into thick wires, and drawing and reducing the diameter of the thick wires to prepare metal-core welding wires with the diameter of 1.6mm and the filling rate of 25%;
wherein, in the stainless steel strip containing rare earth, the mass fraction of each element is as follows: 0.045% of C, 0.021% of P, less than 0.0005% of S, 0.18% of Ni, 0.013% of Cu, 16% of Cr, 1% of Sc and the balance of Fe.
The prepared metal-cored welding wire is subjected to surfacing welding on a wear-resistant steel plate with the thickness of 100mm multiplied by 90mm multiplied by 20mm by a direct-current reverse connection method, the welding process is observed, and chemical components and mechanical properties of deposited metal are detected after welding. Wherein the welding test parameters are shown in the following table, 3 layers are overlaid, 15 lap welds are formed on each layer, and the lap amount is 30% +/-5%.
Welding current (A) Arc voltage (V) Gas flow (L/mm) Welding speed (cm/min) Interlayer temperature (. Degree.C.)
220 18 25 25 150
And (3) welding display: no cracks after welding, the relative wear coefficient of the weld overlay is 1.29, the hardness of the weld overlay is 68HRC, the low-temperature impact toughness at-40 ℃ is 51J/cm, and the crack index (pcm) of the weld overlay is 2.12.
Example 2
A preparation method of a gas-shielded metal core welding wire for hardfacing repair comprises the following specific steps:
(1) Preparing raw materials of metal powder, wherein the raw materials comprise the following components in percentage by mass:
73% of high-carbon ferrochrome, 8% of ferrovanadium, 5% of 75# ferrosilicon, 5% of manganese metal, 2% of aluminum-magnesium alloy, 2% of ferroboron, 1% of ferrotitanium, 2% of ferromolybdenum, 1% of ferrozirconium and the balance ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9.4 percent, the content of Si is 3 percent, and the balance is Fe;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe;
in 75# ferrosilicon, the Si content is 80%, the C content is 0.1%, and the balance is Fe;
the aluminum magnesium alloy is aluminum: an alloy powder of 3:2 for magnesium;
in the ferroboron, the content of B is 19 percent, the content of C is 0.5 percent, the content of Si is 4 percent, the content of Al is 0.5 percent, and the balance is Fe;
in the ferrotitanium, the content of Ti is 29 percent, the content of Al is 8.5 percent, the content of Si is 5 percent, the content of Mn is 2.5 percent, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the Mo content is 56%, the Si content is 1%, the C content is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 53 percent, the Si content is 25 percent, the Al content is 5 percent, and the balance is Fe;
(2) Uniformly mixing the raw materials in the step (1) according to the mass percentage, and heating at 220 ℃ for 3 hours to obtain metal powder;
(3) Rolling the metal powder and a stainless steel band containing rare earth and having the width of 11mm and the thickness of 0.7mm into thick wires, and drawing and reducing the diameter of the thick wires to prepare metal-core welding wires with the diameter of 1.6mm and the filling rate of 24%;
wherein, in the stainless steel strip containing rare earth, the mass fraction of each element is as follows: 0.045% of C, 0.021% of P, less than 0.0005% of S, 0.18% of Ni, 0.013% of Cu, 17% of Cr, 1.5% of Sc and the balance of Fe.
The prepared metal-cored welding wire is subjected to surfacing welding on a wear-resistant steel plate with the thickness of 100mm multiplied by 90mm multiplied by 20mm by a direct-current reverse connection method, the welding process is observed, and chemical components and mechanical properties of deposited metal are detected after welding. Wherein the welding test parameters are shown in the following table, 3 layers are overlaid, 15 lap welds are formed on each layer, and the lap amount is 30% +/-5%.
Welding current (A) Arc voltage (V) Gas flow (L/mm) Welding speed (cm/min) Interlayer temperature (. Degree.C.)
220 18 25 25 150
And (3) welding display: the relative wear coefficient of the overlaying layer is 1.27, the hardness of the overlaying layer is 65HRC, the low-temperature impact toughness at minus 40 ℃ is 55J/cm, and the crack index (pcm) of the overlaying layer is 2.31.
Example 3
A preparation method of a gas-shielded metal-cored welding wire for hardfacing repair comprises the following specific steps:
(1) Preparing raw materials of metal powder, wherein the raw materials comprise the following components in percentage by mass:
76% of high-carbon ferrochrome, 1% of ferrovanadium, 4% of 75# ferrosilicon, 11% of manganese metal, 1% of aluminum-magnesium alloy, 1% of ferroboron, 2% of ferrotitanium, 2% of ferromolybdenum, 1% of ferrozirconium and the balance ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9.5 percent, the content of Si is 3 percent, and the balance is Fe;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe;
in 75# ferrosilicon, the content of Si is 76%, the content of C is 0.1%, and the balance is Fe;
the aluminum magnesium alloy is aluminum: alloy powder of 3:2 magnesium;
in the ferroboron, the content of B is 17 percent, the content of C is 0.5 percent, the content of Si is 4 percent, the content of Al is 0.5 percent, and the balance is Fe;
in the ferrotitanium, the content of Ti is 35 percent, the content of Al is 8.5 percent, the content of Si is 5 percent, the content of Mn is 2.5 percent, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the content of Mo is 55%, the content of Si is 1%, the content of C is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 53 percent, the Si content is 24 percent, the Al content is 6 percent, and the balance is Fe;
(2) Uniformly mixing the raw materials in the step (1) according to the mass percentage, and heating at 240 ℃ for 3 hours to obtain metal powder;
(3) Rolling the metal powder and a stainless steel band containing rare earth and having the width of 12mm and the thickness of 0.8mm into thick wires, and drawing and reducing the diameter of the thick wires to prepare metal core welding wires with the diameter of 1.6mm and the filling rate of 25%;
wherein, in the stainless steel strip containing rare earth, the mass fractions of the elements are as follows: 0.045% of C, 0.021% of P, less than 0.0005% of S, 0.18% of Ni, 0.013% of Cu, 18% of Cr, 1.5% of Ce and the balance of Fe.
The prepared metal-cored welding wire is subjected to surfacing welding on the surface of a wear-resistant steel plate with the thickness of 100mm multiplied by 90mm multiplied by 20mm by adopting a direct current reverse connection method, the welding process is observed, and the deposited metal is subjected to chemical composition and mechanical property detection after welding. Wherein the welding test parameters are shown in the following table, 3 layers are overlaid, 15 lap welds are formed on each layer, and the lap amount is 30% +/-5%.
Welding current (A) Arc voltage (V) Gas flow (L/mm) Welding speed (cm/min) Interlayer temperature (. Degree.C.)
220 18 25 25 150
And (3) welding display: the relative wear coefficient of the overlaying layer is 1.36, the hardness of the overlaying layer is 69HRC, the low-temperature impact toughness at minus 40 ℃ is 52J/cm, and the crack index (pcm) of the overlaying layer is 2.25.
Example 4
A preparation method of a gas-shielded metal-cored welding wire for hardfacing repair comprises the following specific steps:
(1) Preparing raw materials of metal powder, wherein the raw materials comprise the following components in percentage by mass:
72% of high-carbon ferrochrome, 1% of ferrovanadium, 4% of 75# ferrosilicon, 5% of manganese metal, 3% of aluminum-magnesium alloy, 4% of ferroboron, 5% of ferrotitanium, 3% of ferromolybdenum, 2% of ferrozirconium and the balance ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9.6 percent, the content of Si is 3 percent, and the balance is Fe;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe;
75# ferrosilicon, wherein the Si content is 75%, the C content is 0.1%, and the balance is Fe;
the aluminum-magnesium alloy is aluminum: alloy powder of 3:2 magnesium;
in the ferroboron, the content of B is 18 percent, the content of C is 0.5 percent, the content of Si is 4 percent, the content of Al is 0.5 percent, and the balance is Fe;
in the ferrotitanium, the content of Ti is 28 percent, the content of Al is 8.5 percent, the content of Si is 5 percent, the content of Mn is 2.5 percent, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the Mo content is 56%, the Si content is 1%, the C content is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 52 percent, the Si content is 25 percent, the Al content is 7 percent, and the balance is Fe;
(2) Uniformly mixing the raw materials in the step (1) according to the mass percentage, and heating at 250 ℃ for 2 hours to obtain metal powder;
(3) Rolling the metal powder and a stainless steel band containing rare earth and having the width of 10mm and the thickness of 0.6mm into thick wires, and drawing and reducing the diameter of the thick wires to prepare metal-core welding wires with the diameter of 1.6mm and the filling rate of 25%;
wherein, in the stainless steel strip containing rare earth, the mass fractions of the elements are as follows: 0.045% of C, 0.021% of P, less than 0.0005% of S, 0.18% of Ni, 0.013% of Cu, 16% of Cr, 1% of Ce, 1.5% of Sc and the balance of Fe.
The prepared metal-cored welding wire is subjected to surfacing welding on the surface of a wear-resistant steel plate with the thickness of 100mm multiplied by 90mm multiplied by 20mm by adopting a direct current reverse connection method, the welding process is observed, and the deposited metal is subjected to chemical composition and mechanical property detection after welding. Wherein the welding test parameters are shown in the following table, 3 layers are overlaid, 15 lap welds are formed on each layer, and the lap amount is 30% +/-5%.
Welding current (A) Arc voltage (V) Gas flow (L/mm) Welding speed (cm/min) Interlayer temperature (. Degree. C.)
220 18 25 25 150
And (3) welding display: no crack after welding, the relative wear coefficient of the weld overlay is 1.25, the hardness of the weld overlay is 60HRC, the low temperature impact toughness at-40 ℃ is 54J/cm, and the crack index (pcm) of the weld overlay is 1.82.
Example 5
A preparation method of a gas-shielded metal core welding wire for hardfacing repair comprises the following specific steps:
(1) Preparing raw materials of metal powder, wherein the raw materials comprise the following components in percentage by mass:
82% of high-carbon ferrochrome, 1% of ferrovanadium, 4% of 75# ferrosilicon, 5% of manganese metal, 1% of aluminum-magnesium alloy, 1% of ferroboron, 2% of ferrotitanium, 2% of ferromolybdenum, 1% of ferrozirconium and the balance ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9.5 percent, the content of Si is 3 percent, and the balance is Fe;
in the ferrovanadium, the content of V is 50%, the content of C is 0.5%, the content of Si is 2%, the content of Al is 0.8%, and the balance is Fe;
in 75# ferrosilicon, the Si content is 74%, the C content is 0.1%, and the balance is Fe;
the aluminum-magnesium alloy is aluminum: alloy powder of 3:2 magnesium;
in the ferroboron, the content of B is 18 percent, the content of C is 0.5 percent, the content of Si is 4 percent, the content of Al is 0.5 percent, and the balance is Fe;
in the ferrotitanium, the content of Ti is 30 percent, the content of Al is 8.5 percent, the content of Si is 5 percent, the content of Mn is 2.5 percent, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the Mo content is 56%, the Si content is 1%, the C content is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 54 percent, the Si content is 27 percent, the Al content is 5 percent, and the balance is Fe;
(2) Uniformly mixing the raw materials in the step (1) according to the mass percentage, and heating at the temperature of 300 ℃ for 2 hours to obtain metal powder;
(3) Rolling the metal powder and a rare earth-containing stainless steel band with the width of 11mm and the thickness of 0.7mm into thick wires, and drawing and reducing the diameter of the thick wires to prepare metal-core welding wires with the diameter of 1.6mm and the filling rate of 25%;
wherein, in the stainless steel strip containing rare earth, the mass fractions of the elements are as follows: c content 0.045%, P content 0.021%, S content less than 0.0005%, ni content 0.18%, cu content 0.013%, cr content 17%, er content 1.5%, the balance Fe.
The prepared metal-cored welding wire is subjected to surfacing welding on the surface of a wear-resistant steel plate with the thickness of 100mm multiplied by 90mm multiplied by 20mm by adopting a direct current reverse connection method, the welding process is observed, and the deposited metal is subjected to chemical composition and mechanical property detection after welding. Wherein the welding test parameters are shown in the following table, 3 layers are overlaid, 15 lap welds are formed on each layer, and the lap amount is 30% +/-5%.
Welding current (A) Arc voltage (V) Gas flow (L/mm) Welding speed (cm/min) Interlayer temperature (. Degree.C.)
220 18 25 25 150
And (3) welding display: no cracks after welding, the relative wear coefficient of the weld overlay is 1.31, the hardness of the weld overlay is 67HRC, the low temperature impact toughness at-40 ℃ is 53J/cm, and the crack index (pcm) of the weld overlay is 1.93.
Although the present invention has been described above, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, which falls within the protection of the present invention.

Claims (7)

1. The utility model provides a wear-resisting surfacing repair is with gas shield metal core welding wire, characterized by: comprises a flux core and a stainless steel band containing rare earth;
the medicine core comprises the following components in percentage by mass: 70-82% of high-carbon ferrochrome, 1-8% of ferrovanadium, 4-8% of 75# ferrosilicon, 5-11% of manganese metal, 1-3% of aluminum-magnesium alloy, 1-4% of ferroboron, 2-5% of ferrotitanium, 2-3% of ferromolybdenum, 1-2% of ferrozirconium and the balance of ferroniobium;
in the high-carbon ferrochrome, the content of Cr is 64 percent, the content of C is 9 to 10 percent, the content of Si is 3 percent, and the balance is Fe;
the rare earth element in the stainless steel band containing rare earth is more than one of Ce, sc and Er;
the metal-cored welding wire has no cracks after welding, the relative wear coefficient of the surfacing layer is 1.25-1.36, the hardness of the surfacing layer is more than 60HRC, the low-temperature impact toughness at minus 40 ℃ is more than 50J/cm, and the crack index of the surfacing layer is less than 2.5.
2. The gas-shielded metal-cored welding wire for hardfacing restoration according to claim 1, characterized in that the rare earth element content in the stainless steel strip containing rare earth is 0.5 to 2.5% by mass and the chromium content is 16 to 18% (mass fraction).
3. The gas-shielded metal-cored welding wire for hardfacing restoration according to claim 1, wherein the stainless steel strip containing rare earth has a width of 10mm to 12mm and a thickness of 0.6mm to 0.8mm.
4. The gas-shielded metal-cored welding wire for hardfacing repair according to claim 1, wherein a filling rate of the flux core in the metal-cored welding wire is 24% to 25%.
5. The gas-shielded metal-cored welding wire for hardfacing repair according to claim 1, wherein the ferrovanadium contains 50% of V, 0.5% of C, 2% of Si, 0.8% of Al, and the balance of Fe;
75 # in the ferrosilicon, the content of Si is 74.0-80.0 percent, the content of C is 0.1 percent, and the balance is Fe;
the aluminum-magnesium alloy is aluminum: an alloy powder of 3:2 for magnesium;
in ferroboron, the content of B is 17% -19%, the content of C is 0.5%, the content of Si is 4%, the content of Al is 0.5%, and the balance is Fe;
in the ferrotitanium, the content of Ti is 25-35%, the content of Al is 8.5%, the content of Si is 5%, the content of Mn is 2.5%, and the balance is Fe;
in the ferrocolumbium, the Nb content is 70 percent, the C content is 0.5 percent, the Si content is 2 percent, the Al content is 0.8 percent, and the balance is Fe;
in the ferromolybdenum, the content of Mo is 55-56%, the content of Si is 1%, the content of C is 0.1%, and the balance is Fe;
in the ferrozirconium, the Zr content is 52-54%, the Si content is 23-27%, the Al content is 5-7%, and the balance is Fe.
6. The method for preparing the gas-shielded metal-cored welding wire for hardfacing restoration according to any one of claims 1 to 5, characterized by: firstly, taking high-carbon ferrochrome, ferrovanadium and 75 percent of the components in the flux core according to the mass percentage # Mixing ferrosilicon, manganese metal, aluminum-magnesium alloy, ferroboron, ferrotitanium, ferromolybdenum, ferrozirconium and ferroniobium uniformly, and heating to obtain metal powder; and rolling the metal powder and the stainless steel band containing the rare earth into thick wires, and drawing and reducing the diameter of the thick wires to prepare the metal-core welding wire.
7. The preparation method of the gas-shielded metal-cored welding wire for hardfacing repair according to claim 6, wherein the heating temperature is 200-300 ℃ and the heating time is 2-3 h.
CN202110263420.9A 2021-03-11 2021-03-11 Gas-shielded metal-cored welding wire for wear-resistant surfacing repair containing rare earth and preparation method thereof Active CN113118664B (en)

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CN102744532A (en) * 2011-04-19 2012-10-24 王新虎 Iron-based abrasion resisting and reducing surfacing flux-cored wire
CN103418941A (en) * 2013-07-30 2013-12-04 北京工业大学 Welding wire for repairing worn positions of wear-resistant components and manufacturing method thereof
CN103785971A (en) * 2014-01-23 2014-05-14 江苏科技大学 Non-slag self-protection flux-cored wire with ultra-low stomatal sensitivity for bead weld
CN110682032A (en) * 2019-10-31 2020-01-14 天津市永昌焊丝有限公司 Self-protection hard-face surfacing flux-cored wire for repairing cement squeeze roll

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1621193A (en) * 2004-12-23 2005-06-01 北京工业大学 High-hardness, wearable, self-protecting metal cored surfacing welding wire
CN1775454A (en) * 2005-12-09 2006-05-24 北京工业大学 High anticrack, wear-resistance, high-cr cast iron cored solder wire for huild-up welding
CN101670501A (en) * 2009-09-25 2010-03-17 王新虎 Iron-based abrasion resistant overlaying-welding flux-cored wire
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