CN110091028A - A kind of consumable electrode active gases protection build-up welding alloy material - Google Patents

A kind of consumable electrode active gases protection build-up welding alloy material Download PDF

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Publication number
CN110091028A
CN110091028A CN201910509567.4A CN201910509567A CN110091028A CN 110091028 A CN110091028 A CN 110091028A CN 201910509567 A CN201910509567 A CN 201910509567A CN 110091028 A CN110091028 A CN 110091028A
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welding
alloy
iron
build
raw
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Inventor
薛海涛
栾晓平
郭卫兵
陈翠欣
李永艳
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Hebei University of Technology
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Hebei University of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/308Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40Making wire or rods for soldering or welding
    • B23K35/406Filled tubular wire or rods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/04Welding for other purposes than joining, e.g. built-up welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode

Abstract

The present invention is that kind of consumable electrode active gases protects build-up welding alloy material; the component mass percent of the alloy material includes: C:0.27~0.32Wt%; Mn:1.60~1.70Wt%; Cr:1.80~1.90Wt%; Mo:0.95~1.07Wt%, W:0.95~1.05Wt%, V:0.15~0.20Wt%; Si:0.20~0.25Wt%, surplus are iron.The composition of the raw material of the build-up welding alloy material includes mid-carbon fe-mn, medium carbon ferrochrome, ferrosilicon, molybdenum-iron, vanadium iron, ferrotungsten, reduced iron powder;It is packed into H08 pipe silk foreskin steel band after the raw material mixing of the alloy material, the filling rate of welding wire is 17-20%, and the diameter of flux-cored wire is Φ 1.5-1.6;Then metal active gas welding is carried out.Present invention reduces the contents of carbon, and the weldability of material can be improved in welding, the MC type carbide of low-carbon martensite and a large amount of Dispersed precipitates can be also obtained, obtain the hardstanding of high comprehensive performance.

Description

A kind of consumable electrode active gases protection build-up welding alloy material
Technical field
The present invention relates to a kind of consumable electrode active gases to protect build-up welding alloy material.It is welded using the build-up welding alloy material When connecing, the crust of formation has high rigidity, high-wearing feature and heat-resisting quantity, which can be used for workpiece surface In reparation and the exploitation of flux-cored wire.
Background technique
In machine driving and derived energy chemical field, it is its main failure mode that abrasion, which occurs, for component surface.It adopts at present Built-up welding is carried out to matrix surface with welding methods such as Laser Welding, carbon dioxide gas arc weldings, so that it is excellent to assign basis material The performances such as heat-resisting and wear-resisting.The equipment cost of Laser Welding is expensive, and weldment position needs very accurate, reflection with higher The problems such as rate.The spatter of carbon dioxide gas arc welding is big, forms bad.Use metal active gas welding can be with The above-mentioned problem of effective solution, speed of welding is fast, and spatter is small, and effectively reduces welding cost.
At present for the research of high-rigidity resurfacing welding alloy material from the point of view of, high rigidity, wearability alloy are mostly high-chromium cast iron-type Alloy, essential element C, Cr ingredient are respectively as follows: 2-3.6Wt%, 11-30Wt%.Since its hardstanding contains a large amount of eutectic carbon Compound M7C3Deng so as to obtaining very high hardness.But poor be easy to produce of its toughness falls off, and its brittleness easily produces greatly very much Raw crackle, the comprehensive mechanical property of hardstanding are to be improved.
Compared with high-chromium cast iron-type alloy system, iron-based hardfacing alloy system type is more, and price is also relative moderate and can To realize the matched well of intensity, hardness, toughness, wearability, weldability is also fine, has excellent comprehensive mechanical property.But Since Cr, C content are higher in alloy, hardness and toughness are still to be improved.
Summary of the invention
It is an object of the present invention to provide a kind of consumable electrode activity for deficiency existing for above-mentioned hard-facing alloys material Gas Shielded welding alloy material.Contain Cr, Mo, Mn, elements such as w in the build-up welding alloy material, C, Cr content are lower, respectively 0.27~0.32Wt% and 1.80~1.9 0Wt% reduces some such as Ti, rare earth valuable alloying elements, makes welding With in the process, being effectively reduced coarse M23C6Production quantity, and be easier to obtain tiny MC type carbide as main The hardstanding of hard phase, MC type carbide can allow the faying face between matrix and hardening constituent purer, also be easier to disperse point Cloth, and the content of C and alloying element after can reducing metal freezing in austenite is precipitated in the early stage of carbide, to promote base Body is changed into low-carbon lath martensite under the conditions of rapid cooling, is carrying out corresponding heat treatment process, is improving hardstanding hardness Under the premise of, ensure that its good abrasion resistance properties and cracking resistance, also for the reparation of factory's vulnerable part saved it is very big at This.
The technical solution of the present invention is as follows:
A kind of consumable electrode active gases protection build-up welding alloy material, the component mass percent packet of the alloy material It includes: C:0.27~0.32Wt%, Mn:1.60~1.70Wt%, Cr:1.80~1.9 0Wt%, Mo:0.95~1.07Wt%, W: 0.95~1.05Wt%, V:0.15~0.20Wt%, Si:0.20~0.25Wt%, surplus are iron.
The composition of the raw material of the build-up welding alloy material includes mid-carbon fe-mn, medium carbon ferrochrome, ferrosilicon, molybdenum-iron, vanadium iron, tungsten Iron, reduced iron powder;Its component in mass ratio, mid-carbon fe-mn: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron powder =2.030~2.191:2.638~2.811:0.242~0.266:1.545~1.757:0.296~0.402:2.300~ 2.612:95.796~99.316.The particle size range of raw material is 200~350 mesh.
In the raw material composition, the manganese content of mid-carbon fe-mn is 77.6~78.8Wt%;The chrome content of medium carbon ferrochrome is 67.6~68.5Wt%;The silicon content of ferrosilicon is 75.1~76.3Wt%;The amount containing molybdenum of molybdenum-iron is 60.9~61.5Wt%;Vanadium iron Vanadium content be 49.8~50.6Wt%;The tungstenic amount of ferrotungsten is 40.2~41.3Wt%;The iron-content 95 of reduced iron powder~ 98Wt%.
The welding method of the consumable electrode active gases protection build-up welding alloy material, comprising the following steps:
It is packed into H08 pipe silk foreskin steel band after the raw material of the alloy material is mixed, the filling rate of welding wire is 17- 20%, the diameter of flux-cored wire is Φ 1.5-1.6;Then metal active gas welding is carried out;
180~190A of welding current, 30~40mm/min of speed of welding, the 23~24V of weldingvoltage of the protection weldering, The CO for the Ar and 20% that mixed gas is 80%2, 4~5L/min of gas flow.
A kind of flux-cored wire, the welding wire are packed into H08 pipe silk foreskin steel by the raw material of above-mentioned alloy material after evenly mixing It takes and is made, the filling rate of welding wire is 17-20%, and the diameter of flux-cored wire is Φ 1.5-1.6.
Beneficial effects of the present invention are
Alloy material of the present invention reduces phosphorus content, to mention in the case where guaranteeing the precondition of hardstanding intensity and hardness The high shock resistance of weldability and hardstanding, meanwhile, suitable alloying element is added, so that the tissue that postwelding obtains is low The MC type carbide of carbon martensite and a large amount of Dispersed precipitates, to improve the hardness of hardstanding, wear-resisting property and good punching Toughness is hit, Mn has the function of good deoxidation sulphur removal, while forming Si-Mn combined deoxidation with Si, and having significantly reduces built-up welding The ability of O content, forms MnS in conjunction with S in alloy, prevents the generation of low melting point eutectic FeS, can effectively weaken deposited metal The formability of middle fire check.
The distinguishing feature of simple lattice structure carbide is that fusing point is high, hardness is high and stability is good.The hardness of overlay cladding mentions 2 times of high about base material, wearability significantly improves.The form of MC type carbide is mostly the spherical of Dispersed precipitate, lumps, quarter butt The form of shape, carbide does not have wedge angle, is well combined with matrix, all advantageous to the intensity, toughness of material.Tissue is lath Shape martensite adds the MC type carbide particle of Dispersed precipitate significantly to improve the wear-resisting property of matrix, in wear process, more Dissipate distribution MC type carbide particle can be used as resist abrasion particle, lath martensite matrix except can inhibit crackle formed and Extension is outer, can also carbide effectively be supported and be protected.
It is added to the elements such as Cr, Mo in alloy material of the present invention, while reducing the content of carbon, can be improved in welding The weldability of material can also obtain the MC type carbide of low-carbon martensite and a large amount of Dispersed precipitates, obtain high comprehensive performance Hardstanding.Meanwhile precious metal additive amount is few in the alloy material, significantly reduces the cost of the manufacturing, reduces dirt Dye.
Detailed description of the invention
Fig. 1 is to carry out the hardstanding metallograph figure that heap postwelding obtains using the alloy material of embodiment 2.
Fig. 2 is to carry out heap postwelding using the alloy material of embodiment 2, the shape appearance figure obtained after being machined out.
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below, analyzed convenient for related personnel and is understood, this is defined The protection scope of invention simultaneously makes relatively unambiguous boundary.
A kind of component mass percent of consumable electrode active gases protection build-up welding alloy material of the present invention are as follows: C:0.27 ~0.32Wt%, Mn:1.60~1.70Wt%, Cr:1.80~1.9 0Wt%, Mo:0.95~1.07Wt%, W:0.95~ 1.05Wt%, V:0.15~0.20Wt%, Si:0.20~0.25Wt%, surplus are iron.The raw material of above-mentioned alloy material are as follows: in (silicon content is for carbon ferromanganese (manganese content is 77.6~78.8Wt%), medium carbon ferrochrome (chrome content is 67.6~68.5Wt%), ferrosilicon 75.1~76.3Wt%), molybdenum-iron (amount containing molybdenum is 60.9~61.5Wt%), vanadium iron (vanadium content is 49.8~50.6Wt%), tungsten Iron (tungstenic amount is 40.2~41.3Wt%), reduced iron powder (95~98Wt% of iron-content).Its component in mass ratio in carbon Manganese iron: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron powder=2.030~2.191:2.638~2.811:0.242~ 0.266:1.545~1.757:0.296~0.402:2.300~2.612:95.796~99.316.The particle size range of raw material is 200~350 mesh.
Consumable electrode active gases protection build-up welding alloy material of the present invention can be used in workpiece surface reparation or prepare patent medicine Core welding wire.
A kind of flux-cored wire, the welding wire are packed into H08 pipe silk foreskin steel by the raw material of above-mentioned alloy material after evenly mixing It takes and is made, the filling rate of welding wire is 17-20%, and the diameter of flux-cored wire is Φ 1.5-1.6.
The welding method of above-mentioned welding wire is metal active gas welding, 180~190A of welding current, speed of welding 30 ~40mm/min, 23~24V of weldingvoltage, the CO for the Ar and 20% that mixed gas is 80%2, 4~5L/min of gas flow.
Metal active gas welding is used to the safe axis that material is 42CrMo steel using the embodiment, it is main to investigate Tissue, hardness and the wearability of overlay cladding.
Embodiment 1
Prepare raw material: mid-carbon fe-mn: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron according to following quality proportioning Then powder=2.125:2.759:0.253:1.681:0.359:2.469:97.927 is packed into H08 pipe silk foreskin after evenly mixing It is made on steel band, the filling rate of welding wire is 20%, and the diameter of flux-cored wire is Φ 1.6.
The base material of welding is the internal tooth of safe axis made by 42CrMo steel, and the diameter of safe axis is 520mm, every internal tooth Weld length be 175mm.Specific welding parameter are as follows: welding current 180A, speed of welding 30mm/min, weldingvoltage 23V, The CO for the Ar and 20% that mixed gas is 80%2, gas flow 5L/min.
It is measured through EDS energy spectrum analysis, the component mass percent of build-up welding alloy material are as follows: C:0.30Wt%, Mn: 1.67Wt%, Cr:1.88Wt%, Mo:1.03Wt%, W:1.00Wt%, V:0.18Wt%, Si:0.23Wt%, surplus are iron (and micro inevitable impurity element).
Embodiment 2
Prepare raw material: mid-carbon fe-mn: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron according to following quality proportioning Then powder=2.125:2.813:0.253:1.681:0.359:2.469:97.927 is packed into H08 pipe silk foreskin after evenly mixing It is made on steel band, the filling rate of welding wire is 20%, and the diameter of flux-cored wire is Φ 1.6.
The base material of welding is the internal tooth of safe axis made by 42CrMo steel, and the diameter of safe axis is 520mm, every internal tooth Weld length be 175mm.Specific welding parameter are as follows: welding current 180A, speed of welding 30mm/min, weldingvoltage 23V, The CO for the Ar and 20% that mixed gas is 80%2, gas flow 5L/min.
It is measured through EDS energy spectrum analysis, the component mass percent of build-up welding alloy material are as follows: C:0.32Wt%, Mn: 1.67Wt%, Cr:1.90Wt%, Mo:1.03Wt%, W:1.00Wt%, V:0.18Wt%, Si:0.23Wt%, surplus are iron.
The tissue that postwelding obtains is the MC type carbide of low-carbon martensite and a large amount of Dispersed precipitates, to improve hardstanding Hardness, wear-resisting property and good impact flexibility.The obtained seam center of postwelding is also fine, is mingled with etc. there is no stomata and lacks It falls into.
Embodiment 3
Prepare raw material: mid-carbon fe-mn: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron according to following quality proportioning Then powder=2.125:2.788:0.253:1.681:0.359:2.469:97.927 is packed into H08 pipe silk foreskin after evenly mixing It is made on steel band, the filling rate of welding wire is 20%, and the diameter of flux-cored wire is Φ 1.6.
The base material of welding is the internal tooth of safe axis made by 42CrMo steel, and the diameter of safe axis is 520mm, every internal tooth Weld length be 175mm.Specific welding parameter are as follows: welding current 180A, speed of welding 30mm/min, weldingvoltage 23V, The CO for the Ar and 20% that mixed gas is 80%2, gas flow 5L/min.
It is measured through EDS energy spectrum analysis, the component mass percent of build-up welding alloy material are as follows: C:0.30Wt%, Mn: 1.67Wt%, Cr:1.90Wt%, Mo:1.03Wt%, W:1.00Wt%, V:0.18Wt%, Si:0.23Wt%, surplus are.
One metal active gas welding technological parameter of table
It is cut with electric spark wire cutting machine having a size of 20mm × 10mm × 10mm sample.Each embodiment built-up welding is observed respectively Obtained overlay cladding metallographic structure, hardstanding obtained carry out hardness measurement and abrasion test, and table is second is that hardstanding Hardness measurement data, table three are wearability experimental data.Wear test, HR-150 type are carried out with MM-2000 type abrasion tester Rockwell apparatus carries out hardness test.
Table two
Table three
Obtaining experimental data from table two can be seen that using alloy material of the present invention progress built-up welding, and obtained hardstanding is hard Degree has reached 47.2~50.4HRC, adds suitable alloying element, then carries out corresponding modulating treatment process, so that hardness It is significant to improve.
The form of carbide is mainly the fine particle shape carbide that even dispersion is distributed on matrix, and carbide rises wear-resisting The carbide of the effect of particle, face of the good lath martensite matrix of obdurability to distribution on it plays good support And protective effect, therefore wearability is preferable.
Consumable electrode active gases of the present invention protects build-up welding alloy material, ensure that the hardness and wearability of hardstanding, effectively The service life for increasing workpiece, saved metal resource, met the energy saving theory of country.
Cr content of the present invention is designed as 1.80~1.90Wt%.It is M that the carbide of Cr, which is primarily present form,7C3Type, this type The carbide of type is in easily net distribution along crystal boundary, its presence causes the wearability of built-up welding tissue and crack resistance that can all be deteriorated.This The content of chromium is only 1.80~1.90Wt% in the alloy material of invention, and the same of the harden ability of steel can be improved in the chromium of lower content When can also be improved the intensity, hardness and wearability of hardstanding.
C content of the present invention is designed as 0.27~0.32Wt%.Welding wire weldability not only can be improved in lower carbon content, together When, it can also react with carbides such as V, generate MC type carbide, by refinement crystal grain and change carbonization The form of object improves the intensity and toughness of hardstanding.
Mn content of the present invention is 1.60~1.70Wt%.Mn is austenitizing formation element, can reduce Ms point, and raising is quenched Permeability, Mn have the function of good deoxidation sulphur removal.
Mo content of the present invention is 0.95~1.07Wt%.Mo is middle carbide, is produced by being solid-solution in matrix Raw solution strengthening, improves harden ability, refines crystal grain.As Mo >=3%, post-curing peak value is excessively high, it will to plasticity and toughness, toughness It has adverse effect on.
W content of the present invention is 0.95~1.05Wt%.The effect of W is similar to Mo, addition element W appropriate, hardfacing alloy Impact flexibility can also be correspondingly improved.
V content of the present invention is 0.15~0.20Wt%.V is carbide, and V is the member for causing post-curing Element, in hardfacing alloy, the carbide primarily formed is VC, and the presence of a small amount of V is not only advantageous to thinning microstructure, can also improve The obdurability of hardfacing alloy.
Si content of the present invention is 0.20~0.25Wt%.A small amount of Si is added, the starting temperature of martensite transfor mation can be reduced Ms point is spent, the content of retained austenite in overlay is increased, meanwhile, improve the stability of retained austenite.
Of the present invention is a kind of consumable electrode active gases protection build-up welding alloy material, is closed by the way that Cr, Mo, V etc. is added Gold element improves the hardness and abrasive resistance of ferrous alloy, improves stability, saved resource.
It is specific embodiments of the present invention above.But protection scope of the present invention is not limited to this, it is any to be familiar with ability The related technical personnel in domain within the technical scope disclosed by the invention, without the change or replacement that creativeness is expected, should It is included within the scope of protection of the present invention, therefore, protection scope of the present invention should be to protect model defined by claims Subject to enclosing.
Unaccomplished matter of the present invention is well-known technique.

Claims (5)

1. a kind of consumable electrode active gases protects build-up welding alloy material, it is characterized in that the component quality percentage of the alloy material Than including: C:0.27 ~ 0.32Wt%, Mn:1.60 ~ 1.70Wt%, Cr:1.80 ~ 1.9 0Wt%, Mo:0.95 ~ 1.07 Wt%, W: The Wt% of Wt%, Si:0.20 ~ 0.25 of 0.95 ~ 1.05 Wt%, V:0.15 ~ 0.20, surplus is iron.
2. consumable electrode active gases as described in claim 1 protects build-up welding alloy material, it is characterized in that the hardfacing alloy The composition of the raw material of material includes mid-carbon fe-mn, medium carbon ferrochrome, ferrosilicon, molybdenum-iron, vanadium iron, ferrotungsten, reduced iron powder;The matter of its component Amount are as follows: mid-carbon fe-mn: medium carbon ferrochrome: ferrosilicon: molybdenum-iron: vanadium iron: ferrotungsten: reduced iron powder=2.030 ~ 2.191:2.638 ~ 2.811: 0.242 ~ 0.266:1.545 ~ 1.757:0.296 ~ 0.402:2.300 ~ 2.612:95.796 ~ 99.316;The particle size range of raw material For 200 ~ 350 mesh.
3. consumable electrode active gases as claimed in claim 2 protects build-up welding alloy material, it is characterized in that the raw material forms In, the manganese content of mid-carbon fe-mn is 77.6 ~ 78.8 Wt%;The chrome content of medium carbon ferrochrome is 67.6 ~ 68.5 Wt%;Ferrosilicon it is siliceous Amount is 75.1 ~ 76.3 Wt%;The amount containing molybdenum of molybdenum-iron is 60.9 ~ 61.5 Wt%;The vanadium content of vanadium iron is 49.8 ~ 50.6 Wt%;Tungsten The tungstenic amount of iron is 40.2 ~ 41.3 Wt%;95 ~ 98 Wt% of iron-content of reduced iron powder.
4. the welding method of consumable electrode active gases protection build-up welding alloy material as described in claim 1, it is characterized in that including Following steps:
It is packed into H08 pipe silk foreskin steel band after the raw material of the alloy material is mixed, the filling rate of welding wire is 17-20%, medicine The diameter of core welding wire is Φ 1.5-1.6;Then metal active gas welding is carried out;
180 ~ the 190A of welding current, 30 ~ 40mm/min of speed of welding, 23 ~ 24V of weldingvoltage of the protection weldering, gaseous mixture The CO for the Ar and 20% that body is 80%2, 4 ~ 5L/min of gas flow.
5. a kind of flux-cored wire, it is characterized in that the welding wire is packed into H08 pipe silk by the raw material of above-mentioned alloy material after evenly mixing It is made on foreskin steel band, the filling rate of welding wire is 17-20%, and the diameter of flux-cored wire is Φ 1.5-1.6.
CN201910509567.4A 2019-06-13 2019-06-13 A kind of consumable electrode active gases protection build-up welding alloy material Pending CN110091028A (en)

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