CN103495816A - Stainless steel flux cored wire protected by CO2 gas - Google Patents
Stainless steel flux cored wire protected by CO2 gas Download PDFInfo
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- CN103495816A CN103495816A CN201310485114.5A CN201310485114A CN103495816A CN 103495816 A CN103495816 A CN 103495816A CN 201310485114 A CN201310485114 A CN 201310485114A CN 103495816 A CN103495816 A CN 103495816A
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- iron
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- medicine core
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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
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
-
- 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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- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a stainless steel flux cored wire protected by CO2 gas. The stainless steel flux cored wire protected by CO2 gas is characterized in that flux cored powder and a steel belt wrapping the flux cored powder are included, and the flux cored powder of the flux cored wire comprises, by weight, 15-35% of rutile, 12-25% of silicon manganese alloy, 12-30% of iron powder, 5-16% of nickel powder, 3-10% of aluminium magnesium alloy, 10-25% of micro-carbon ferro chrome, 5-15% of ferro-molybdenum and 5-15% of ferrovanadium. The stainless steel flux cored wire protected by CO2 gas has the advantages of being suitable for welding on small-specification ultrathin stainless steel devices and containers.
Description
Technical field
The present invention relates to the welding material of metal technical field, be specifically related to a kind of CO
2the gas shield stainless flux-cored wire.
Background technology
At present, the stainless flux-cored wire specification of using on market only has φ 1.2mm and above product, but the welding wire of this specification is difficult to realize at ultra-thin stainless steel ware, reaches on container and weld; But also must weld with argon arc welding, if use low, the easy to operate manual continuous welding of price, the use of (1.2mm and more than) because large specification welding wire, when welding, welding machine to adopt relatively large current/voltage (more than electric current 220A, more than voltage 25V) can cause soldered object (due to ultra-thin) to puncture or damage etc.
And, the stainless flux-cored wire used on market now is because proportion is little, when its shared space of welding wire that need in steel band, fill same amount large, in steel band pressing, drawing, tube reducing process, because medicine core powder wherein takes up room greatly, thereby drawing process medicine core pruinescence sharply compresses and steel band is produced to pressure causes steel band easily to rupture, leak powder.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, provide a kind of and be applicable to small dimension (φ 0.6mm), can realize at ultra-thin stainless steel ware, reach the CO welded on container
2the gas shield stainless flux-cored wire.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of CO
2the gas shield stainless flux-cored wire; the steel band that comprises medicine core powder and this medicine core powder of parcel; composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 15-35%; silicomangan 12-25%, iron powder 12-30%, nickel powder 5-16%; almag 3-10%; chromic carbide iron 10-25%, molybdenum-iron 5-15%, vanadium iron 5-15%.
As preferably, above-mentioned CO
2the gas shield stainless flux-cored wire; the steel band that comprises medicine core powder and this medicine core powder of parcel; composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 18-25%; silicomangan 10-15%, iron powder 15-20%, nickel powder 8-12%; almag 3-8%; chromic carbide iron 15-20%, molybdenum-iron 8-12%, vanadium iron 6-12%.
As further preferred, above-mentioned CO
2the gas shield stainless flux-cored wire, comprise medicine core powder and the steel band that wraps up this medicine core powder, and composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 21%, silicomangan 13%; iron powder 17%, nickel powder 9%, almag 6%; chromic carbide iron 18%, molybdenum-iron 10%, vanadium iron 6%.
As further preferred, above-mentioned CO
2the gas shield stainless flux-cored wire, comprise medicine core powder and the steel band that wraps up this medicine core powder, and composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 18%, silicomangan 15%; iron powder 15%, nickel powder 12%, almag 5%; chromic carbide iron 20%, molybdenum-iron 9%, vanadium iron 6%.
As further preferred, above-mentioned CO
2the gas shield stainless flux-cored wire, comprise medicine core powder and the steel band that wraps up this medicine core powder, and composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 23%, silicomangan 11%; iron powder 15%, nickel powder 8%, almag 8%; chromic carbide iron 15%, molybdenum-iron 8%, vanadium iron 12%.
The present invention is above-mentioned for the steel band specification requirement of wrapping up medicine core powder is:
(1) stainless steel belt chemical composition and mechanical property operative norm (GB/T222-2006) table 1 specific as follows:
Table 1
(2) specification requirement
2.1 applied code: the steel band nominal thickness is 0.40 ± 0.001mm, and nominal width is 10-20mm flux-cored wire cold-rolled strip.
2.2 the thickness permissible variation should meet the regulation of table 2:
Table 2
2.3 surface quality
Stainless steel band surface must not have scab, crackle, be mingled with, folding and other to using harmful defect, steel must not have layering.
Allow≤slight the pit of 1/2 thickness deviation of stainless steel band surface, shadow scratch, allow local oxidation tint.Minute bubbles and the roll impression of allow≤1/2 thickness deviation of reverse side, but should guarantee minimum thickness.
Stainless steel band is in the quantity-produced process, and because the blemish to local is difficult for finding and is difficult to removing, therefore, stainless steel band allows the delivery of band defect, but defective part must not surpass 5% of every volume total length.
The surface texture of stainless steel band
Roughness: Ra=0.50 ∽ 1.3 υ m, desired value: Ra=0.70 ∽ 1.0 υ m
2.4 detect rule and test method
The regulation that the detection rule of stainless steel band and test method should meet Q/HYAQ01 and Q/HYAQ04 standard.Above-mentioned silicomangan (with reference to the GB/T4008--1996) chemical composition of the present invention is in Table 3:
Table 3
Above-mentioned molybdenum-iron (with reference to the GB/T3649--1987) chemical composition of the present invention is in Table 4:
Table 4
Above-mentioned chromic carbide iron (with reference to the GB/T5683-1987) chemical composition of the present invention is in Table 5:
Table 5
Above-mentioned almag (with reference to the GB/T5150--85) chemical composition of the present invention is in Table 6:
Table 6
Above-mentioned vanadium iron (with reference to the GB/T4139--2004) chemical composition of the present invention is in Table 7:
Table 7
The above-mentioned iron powder of the present invention be reduced iron powder (with reference to GB/T4136--1994) chemical composition in Table 8:
Table 8
Above-mentioned nickel powder (with reference to the GB/T2085--1989) chemical composition of the present invention is in Table 9:
Table 9
The above-mentioned rutile chemical composition of the present invention is in Table 10:
Table 10
The granularity of above-mentioned each raw material of the present invention requires:
Mineral powder of the present invention (rutile) is through 695-705 ℃ of baking; Metal powder (silicomangan, iron powder, nickel powder, almag, chromic carbide iron, molybdenum-iron, vanadium iron etc.) toasts and is incubated 5-6 hour through 125-135 ℃ and uses after natural cooling screening.To remove moisture, thereby reduce or eliminate the weld defect that the existence due to moisture causes.
The chemical composition content of above-mentioned each component raw material of the present invention is all calculated by weight percentage, and each chemical composition sum is 100%, common each complete component of component.
The effect that above-mentioned each raw material components of the present invention plays:
Rutile: use as slag former, strictly control the addition of slag former, can attenuate postwelding skull, be conducive to the effusion of gas in molten bath, reduce pore quantity, improve the deposition rate of welding wire, rutile addition 15-35%.
Silicomangan: add appropriate element silicon to contribute to improve appearance of weld, addition 12-25% in formula.
Iron powder (reduced iron powder): the addition of iron powder increases can contribute to improve deposition efficiency, the pore occurred while reducing on priming paint steel plate high speed fillet welding and the quantity of pit, iron powder addition 12-30%.
Magnalium magnesium alloy: add appropriate magnadure to contribute to reduce the oxygen content in weld metal in formula, be beneficial to the improvement of weld metal toughness; Almag addition 3-10%.
Nickel powder: add appropriate nickel powder to contribute to improve welding seam toughness, addition 8-12% in formula.
Chromic carbide iron: add appropriate chromic carbide iron to contribute to improve weld strength in formula, chromic carbide iron addition 10-25%.
Molybdenum-iron: add appropriate molybdenum-iron to contribute to improve weld strength in formula; Molybdenum-iron addition 5-15%.
Vanadium iron: add appropriate vanadium iron can improve the low-temperature impact toughness value of weld seam, vanadium iron addition 6-12% in formula.
The particle size of above-mentioned each component of medicine core powder is all crossed 100% mesh sieve, and suitable medicine core powder particles is conducive to composition and mixes.
The present invention also provides a kind of above-mentioned CO
2the preparation method of gas shield stainless flux-cored wire, preparation process comprises:
(1) according to formula rate by CO
2each component of medicine core powder of gas shield stainless flux-cored wire mixes;
(2) will wrap up the steel band that medicine core powder uses and first be bundled into U-lag, then, to adding half of the core powder total amount of being used as medicine in U-lag, flatten again after with forming machine, U-lag being healed up; Then the steel band after flattening is bundled into to U-shaped again, adds the medicine core powder that remains second half, with forming machine, the secondary U-lag is healed up and makes the medicinal powder parcel wherein, then through wire drawing machine, pursue road drawing, tube reducing, finally make its diameter reach 0.6mm, obtain CO
2the gas shield stainless flux-cored wire.
The addition of the above-mentioned medicine core of the present invention powder is the medicine core powder that accounts for welding wire gross weight 9-11%.
The welding wire that the present invention is above-mentioned, when welding machine welds, its welding machine is electric current 120-140A, voltage 16-18V.Advantage of the present invention and beneficial effect:
1. medicine core powder of the present invention is than great, when its shared space of welding wire that need in steel band, fill same amount little, in steel band pressing, drawing, tube reducing process, because medicine core powder wherein takes up room little, drawing process medicine core powder can sharply not compress, thereby can not produce larger pressure to steel band, steel band is not easy fracture, leaks powder at drawing process, successfully realizes manufacture and the formation of the small dimension welding wire that diameter is 0.6mm.
2. the welding wire that prepared by medicine core powder of the present invention successfully realize ultra-thin stainless steel ware, and container on weld, and the flux-cored wire of extraordinary small dimension is used electric current 120-140(A), voltage 16-18(V) can perfectly realize welding; The fusion of welding bead is level and smooth, attractive in appearance.
3. medicine core powder of the present invention is realized preparing the small dimension welding wire that diameter is 0.6mm first, and the welding wire of this small dimension report not also at present, and the welding wire of 1.2mm and above specification is only arranged; And, the method of tradition for welding ultra-thin stainless steel utensil and container, only can use specification for 1.2mm and also will adopt argon arc welding to realize, if use low, the easy to operate manual continuous welding of price, the use of (1.2mm and more than) because large specification welding wire, when welding, welding machine to adopt relatively large current/voltage (more than electric current 220A, more than voltage 25V) can cause soldered object (due to ultra-thin) to puncture or damage etc.And small dimension welding wire of the present invention successfully overcomes the deficiency of above-mentioned existing stainless flux-cored wire, can realize manual continuous welding process simple to operate, that cost is low.
4. the preparation method of welding wire of the present invention, adopt the method for rolling U-lag for twice and wrapping up respectively medicine core powder twice, adopt said method, medicine core powder addition each time is few, the amount of the medicine core powder of the steel band parcel of every one deck is relatively just few, therefore in pressing or drawing process, can not cause medicine core powder sharply to compress the phenomenon appearance that steel band is caused to excessive pressure, thereby effectively protect the integrality of steel band, and can realize the small dimension welding wire preparation of 0.6mm diameter; And adding at twice the core powder that is used as medicine, it is more even that the medicine core powder of whole welding wire distributes, and at the welding process welding wire, has higher deposition rate and larger operating efficiency, and weldment is flawless during welding falls into.
5. in use, the generation of face of weld slag is few, spatter is little, appearance of weld is good and weld fumes is few for stainless flux-cored wire of the present invention.Can adopt the manual welding welding, can also need to adjust flexibly each component proportion of medicine core powder according to welding, use more convenient.
The accompanying drawing explanation
The processing process figure that accompanying drawing is submerged-arc welding flux-cored wire of the present invention.
The specific embodiment:
Below by embodiment, the present invention is described in further detail, but the present invention not only is confined to following examples.
Embodiment 1
Selecting the steel band nominal thickness is 0.40mm, nominal width is cut into to the flux-cored wire cold-rolled strip of 14mm, adopts forming machine that it is rolled into to U-lag.The 1000 gram submerged-arc welding flux-cored wires of take are example: get rutile 210 grams, silicomangan 130 grams, iron powder 170 grams, nickel powder 90 grams, almag 60 grams, chromic carbide iron 180 grams, molybdenum-iron 100 grams, vanadium iron 60 grams.All raw materials are added in mixer and mix 30 minutes, then get 500 grams and add in the U-lag steel band; U-lag is healed up, make medicine core powder parcel wherein flatten, again be rolled into U-lag, remaining 500 gram medicine core powder are added in the U-lag steel band and then through wire drawing machine, pursue road drawing, tube reducing, finally make the diameter of welding wire reach 0.6mm.Medicine core powder loading accounts for 10% of welding wire gross weight.
1) mechanical performance of embodiment of the present invention sample welding wire is in Table 11:
1.1 tension test
While measuring the yield strength of deposited metal yield point or yield strength and other materials, elastic strain speed must not surpass per second 30mm, after load or yield load when reaching yield point, while measuring tensile strength, the strain rate maximum rises to per second 40% gauge length.
1.2 impact test:
All impact tests are all carried out on the charpy impact test machine of approval, and the impact energy of testing machine must not be lower than 150J.When test temperature is not normal temperature, the temperature fluctuation range of test should be controlled in 0 ± 1 ℃, and keep a period of time (6 minutes), make specimen temperature uniformity in the whole cross section of sample, should take adequate measures to prevent from the actual tests process occurring larger variations in temperature simultaneously.If when disputable, room temperature should be taken as 18-25 ℃.
Table 11
2) chemical composition test
Welding wire is carried out after the built-up welding test plate (panel) freezes, getting the centre position wlding.By direct-reading spectrometer, got wlding is carried out to the chemical composition spectroscopic test, the measured signal component value of equipment is test value.
Result is as shown in table 12:
Table 12
From result, show, the sample of the embodiment of the present invention 1 preparation has good mechanical performance, goes for the welding of super thin metal object.
Embodiment 2
Selecting the steel band nominal thickness is 0.40mm, nominal width is cut into to the flux-cored wire cold-rolled strip of 14mm, adopts forming machine that it is rolled into to U-lag.The 1000 gram submerged-arc welding flux-cored wires of take are example: get rutile 180 grams, silicomangan 150 grams, iron powder 150 grams, nickel powder 120 grams, almag 50 grams, chromic carbide iron 200 grams, molybdenum-iron 90 grams, vanadium iron 60 grams.All raw materials are added in mixer and mix 30 minutes, then get 500 grams and add in the U-lag steel band; U-lag is healed up, make medicine core powder parcel wherein flatten, again be rolled into U-lag, remaining 500 gram medicine core powder are added in the U-lag steel band and then through wire drawing machine, pursue road drawing, tube reducing, finally make the diameter of welding wire reach 0.6mm.Medicine core powder loading accounts for 10% of welding wire gross weight.
Embodiment 3
Selecting the steel band nominal thickness is 0.40mm, nominal width is cut into to the flux-cored wire cold-rolled strip of 14mm, adopts forming machine that it is rolled into to U-lag.The 1000 gram submerged-arc welding flux-cored wires of take are example: get rutile 230 grams, silicomangan 110 grams, iron powder 150 grams, nickel powder 80 grams, almag 80 grams, chromic carbide iron 150 grams, molybdenum-iron 80 grams, vanadium iron 120 grams.All raw materials are added in mixer and mix 30 minutes, then get 500 grams and add in the U-lag steel band; U-lag is healed up, make medicine core powder parcel wherein flatten, again be rolled into U-lag, remaining 500 gram medicine core powder are added in the U-lag steel band and then through wire drawing machine, pursue road drawing, tube reducing, finally make the diameter of welding wire reach 0.6mm.Medicine core powder loading accounts for 10% of welding wire gross weight.
Claims (10)
1. a CO
2the gas shield stainless flux-cored wire; the steel band that comprises medicine core powder and this medicine core powder of parcel; it is characterized in that: composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 15-35%; silicomangan 12-25%, iron powder 12-30%, nickel powder 5-16%; almag 3-10%; chromic carbide iron 10-25%, molybdenum-iron 5-15%, vanadium iron 5-15%.
2. CO according to claim 1
2the gas shield stainless flux-cored wire is characterized in that: composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 18-25%, silicomangan 10-15%; iron powder 15-20%, nickel powder 8-12%, almag 3-8%; chromic carbide iron 15-20%, molybdenum-iron 8-12%, vanadium iron 6-12%.
3. CO according to claim 1
2the gas shield stainless flux-cored wire is characterized in that: composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 21%, silicomangan 13%, iron powder 17%, nickel powder 9%, almag 6%, chromic carbide iron 18%, molybdenum-iron 10%, vanadium iron 6%.
4. CO according to claim 1
2the gas shield stainless flux-cored wire is characterized in that: composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 18%, silicomangan 15%, iron powder 15%, nickel powder 12%, almag 5%, chromic carbide iron 20%, molybdenum-iron 9%, vanadium iron 6%.
5. CO according to claim 1
2the gas shield stainless flux-cored wire is characterized in that: composition and the weight percent of the medicine core powder of this welding wire are as follows: rutile 23%, silicomangan 11%, iron powder 15%, nickel powder 8%, almag 8%, chromic carbide iron 15%, molybdenum-iron 8%, vanadium iron 12%.
6. according to any described CO of claim in claim 1-5
2the gas shield stainless flux-cored wire is characterized in that: described molybdenum-iron is following commercially available prod: trade mark FeMo55-A, chemical composition Mo>=55.0, Si≤1.0, S≤0.10, P≤0.08, C≤0.20, Cu0.50, Sb≤0.05, Sn≤0.06; Perhaps trade mark FeMo55-B, chemical composition Mo>=55.0, Si≤1.5, S≤0.15, P≤0.10, C≤0.25, Cu1.00, Sb≤0.08, Sn≤0.03.
7. according to any described CO of claim in claim 1-5
2the gas shield stainless flux-cored wire is characterized in that: described chromic carbide iron is following commercially available prod: trade mark HCr000, chemical composition Cr>=50, C≤0.10, Si≤2.0, P≤0.05, S≤0.04; Perhaps trade mark HCr000Si, chemical composition Cr60～70, C≤0.12, Si4.0～5.5, P≤0.06, S≤0.04.
8. according to any described CO of claim in claim 1-5
2the gas shield stainless flux-cored wire is characterized in that: described almag is following commercially available prod: trade mark FLM3, chemical composition Al47～53%, Mg47～53%, Al+Mg>=97.5%, Fe≤0.4%; Described vanadium iron is following commercially available prod: trade mark FeV50, and chemical composition V>=50.0%, Si≤2.0%, P≤0.10%, S≤0.06%, Al≤0.5%, Mn≤0.05, C≤0.10, surplus is iron; Described iron powder is following commercially available prod: trade mark FHD100-25, chemical composition Fe>=98.0%, C≤0.05%, Si≤0.15%, Mn≤0.4%, P≤0.02%, S≤0.02%, O≤1.0%; Described nickel powder is following commercially available prod: trade mark FNi-1, Ni>=98%, C≤0.02%, P≤0.01%, S≤0.01%; Described rutile is following commercially available prod: trade mark Australia, chemical composition TiO
2>=95.0%, FeO≤0.5, S≤0.03, P≤0.05.
9. a CO
2the preparation method of gas shield stainless flux-cored wire is characterized in that: preparation process comprises:
(1) according to formula rate by CO
2each component of medicine core powder of gas shield stainless flux-cored wire mixes;
(2) will wrap up the steel band that medicine core powder uses and first be bundled into U-lag, then, to adding half of the core powder total amount of being used as medicine in U-lag, flatten again after with forming machine, U-lag being healed up; Then the steel band after flattening is bundled into to U-shaped again, adds the medicine core powder that remains second half, with forming machine, the secondary U-lag is healed up and makes the medicinal powder parcel wherein, then through wire drawing machine, pursue road drawing, tube reducing, finally make its diameter reach 0.6mm, obtain CO
2the gas shield stainless flux-cored wire.
10. CO according to claim 9
2the preparation method of gas shield stainless flux-cored wire is characterized in that: the addition of described medicine core powder is the medicine core powder that accounts for welding wire gross weight 9-11%; Welding machine during welding is electric current 120-140A, voltage 16-18V.
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| CN201310485114.5A CN103495816B (en) | 2013-10-16 | 2013-10-16 | CO2 gas shield stainless flux-cored wire and preparation method thereof |
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| CN201310485114.5A CN103495816B (en) | 2013-10-16 | 2013-10-16 | CO2 gas shield stainless flux-cored wire and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104526179A (en) * | 2014-12-02 | 2015-04-22 | 常州市正阳焊接材料有限公司 | CO2 protective high-toughness carbon steel flux-cored wire |
| CN104858573A (en) * | 2015-05-06 | 2015-08-26 | 贵州航天凯宏科技有限责任公司 | High-strength flux-cored wire |
| CN107498212A (en) * | 2017-10-18 | 2017-12-22 | 镇江市锶达合金材料有限公司 | A kind of property of medicine solder wire material formula and its manufacture method |
| CN107717258A (en) * | 2017-11-30 | 2018-02-23 | 桂林航天工业学院 | CO 2 gas-shielded low-alloy steel flux-cored wire and its production method |
| CN108971802A (en) * | 2018-07-16 | 2018-12-11 | 中国京冶工程技术有限公司 | A kind of flux-cored wire preparation method suitable for robot welding |
| CN112404797A (en) * | 2020-12-06 | 2021-02-26 | 中铁宝桥集团有限公司 | Novel welding wire and method for welding 321+ Q370qENH composite steel transition layer |
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