CN106925918A - A kind of new self-protection flux-cored wire for X80 pipe line steels - Google Patents

A kind of new self-protection flux-cored wire for X80 pipe line steels Download PDF

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Publication number
CN106925918A
CN106925918A CN201710297229.XA CN201710297229A CN106925918A CN 106925918 A CN106925918 A CN 106925918A CN 201710297229 A CN201710297229 A CN 201710297229A CN 106925918 A CN106925918 A CN 106925918A
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China
Prior art keywords
parts
pipe line
cored wire
protection flux
new self
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CN201710297229.XA
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Chinese (zh)
Inventor
侯杰昌
马强
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Tianjin Yongchang Welding Wire Co Ltd
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Tianjin Yongchang Welding Wire Co Ltd
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Priority to CN201710297229.XA priority Critical patent/CN106925918A/en
Publication of CN106925918A publication Critical patent/CN106925918A/en
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Classifications

    • 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
    • B23K35/22—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
    • B23K35/3073—Fe as the principal constituent with Mn as next major 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
    • B23K35/3601—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 with inorganic compounds as principal constituents
    • B23K35/3603—Halide salts
    • B23K35/3605—Fluorides
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention provides a kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core includes the component of following parts by weight, Fe2O369 parts；47 parts of carbonate；17 20 parts of Al Mg；49 60 parts of fluoride；9 13 parts of rare earth ferrosilicon；Al2O34 10 parts；14 parts of molybdenum-iron powder；47 parts of manganese metal；13 parts of crome metal；8 10 parts of nickel powder.A kind of new self-protection flux-cored wire for X80 pipe line steels of the present invention, improves weld seam low-temperature impact toughness and its discreteness.

Description

A kind of new self-protection flux-cored wire for X80 pipe line steels
Technical field
The invention belongs to field of welding material, more particularly, to a kind of self-protection flux-cored wire.
Background technology
Self-protection flux-cored wire semiautomatic welding welding method have field wind loading rating strong, beautiful appearance, weld defect it is few, Welding efficiency is high and is easy to the advantages of grasping, and critical role is occupied in long-distance oil ＆ gas pipeline welding procedure.2007 start to build If the second west to east gas pipeline project, the domestic X80 steel-grade material of first time large-scale application realizes the extensive of Chinese high-grade pipe Using the historic leap from pursuing to taking the lead in race, but high-grade pipe self-protection flux-cored wire semiautomatic welding weld seam impact toughness from Dissipate the problem that property is big and individual ramp absorption work(is relatively low gradually to manifest in work progress, as the whole society compels clean energy resource It is essential and asks the increasing of oil-gas pipeline engineering, it is a collection of to make tranquil interconnection, the line of Shan capital four, Sino-Russian eastern line etc. in three lines one of transfering natural gas from the west to the east National strategy key project goes into operation, and the problems demand needs to solve.
The content of the invention
In view of this, the present invention is directed to propose a kind of new self-protection flux-cored wire for X80 pipe line steels, with welding During, except wlding chemical composition is transitioned into weld seam at home and abroad, mother metal chemical composition is also dissolved into weld seam, reaches good Match somebody with somebody, improve welding seam toughness and its discreteness.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust；
The drug core component includes the component of following parts by weight, Fe2O36-9 parts；Carbonate 4-7 parts；Al-Mg 17-20 Part；Fluoride 49-60 parts；Rare earth ferrosilicon 9-13 parts；Al2O34-10 parts；1-4 parts of molybdenum-iron powder；Manganese metal 4-7 parts；Crome metal 1-3 Part；Nickel powder 8-10 parts.
Preferably, the fluoride includes the component of following parts by weight, BaF220-25 parts；CaF213-16 parts； LiF216-19 parts.
Preferably, the carbonate is BaCO3。
Preferably, the drug core component includes that the drug core component includes the component of following parts by weight, Fe2O38-9 parts； Carbonate 5-7 parts；Al-Mg 19-20 parts；BaF220-23 parts；CaF213-15 parts；LiF216-17 parts；Rare earth ferrosilicon 9-10 parts； Al2O38-10 parts；3-4 parts of molybdenum-iron powder；Manganese metal 6-7 parts；Crome metal 1-2 parts；Nickel powder 8-9 parts.
Preferably, the rare earth ferrosilicon includes the component of following parts by weight, and rare earth is the 24- of rare earth ferrosilicon total amount 27%；Silicon for rare earth ferrosilicon total amount≤43%；Balance of Fe.
Preferably, the nickel powder purity is more than 99%.
Preferably, the flux cored filler rate is 19-30%.
Preferably, the crust uses high-quality mild steel, trade mark AYHS1；Composition including following percentage by weight：C≤ 0.03%, Mn≤0.35%, Si≤0.03%, P≤0.015%, S≤0.015%, balance of Fe.
Preferably, the Al2O3Its granular size is 110-120 mesh.
Here is on constituting the effect of medicine core each component in the present invention and the explanation of content range.
By long-term research and analysis, novelty to the addition of Fe in medicine core2O3, and it is 6-9 to control parts by weight Part, add Fe2O3The fusing point and viscosity and electric arc penetration power of slag can be improved, the handling of welding is improved, all position welding is realized Connect；But, when the consumption of iron oxide is excessive, can increase the oxygen content in slag and electric arc, easily cause oxide to be mingled with And deteriorate welding procedure.
Al-Mg, is deoxidier and denitrifier, plays pure weld seam, reduces the oxygen content and nitrogen content of weld metal, to improve The toughness of weld seam, makes weld seam have low-temperature flexibility.
Wherein fluoride is mainly gas making, slag making and dehydrogenation, self-protection flux-cored wire is produced protective gas in burning； There is CaF2 strong shoddye to act on, and content is too low, and shoddye scarce capacity, too high levels easily cause splashing, arc stability Decline；All content controls are in 13-16%.BaF2 is main can to support very short electric arc in welding, reduce arc energy With welding wire burning velocity, molten bath is preferably controlled.In lithium fluoride elemental lithium for low ionization potential material, can as arc stabilizer, Improve appearance of weld.
Rare earth in rare earth ferrosilicon, the purpose for improving toughness is reached by improving structural homogenity and crystal grain thinning.
Al2O3The physical property of slag can be improved, improve removability of slag energy.
The purpose for adding barium carbonate is to produce gas, protecting effect and enhancing blow force of arc is improved, so as to be conducive to carrying Fusion penetration high and appearance of weld, it is to avoid produce the defects such as incomplete fusion, slag inclusion.But it is obvious to be splashed during too high levels, deteriorate operation ring Border.
P and S is impurity element in alloy, it is excessive in the welding metal in the presence of, the toughness and ductility one of welding metal Deterioration is played, heat cracking is easily induced, it is preferred to reduce S and P content as far as possible.
Si and Al are deoxidant element, reduce the oxygen content in welding metal, improve the cleannes of welding metal, but contain When measuring excessive, the toughness of welding metal can be reduced.
Cr has the effect that the fatigue strength of weld part is improved, but Cr content overproofs, welding metal overvulcanization, can cause The reduction of cracking resistance and toughness.
Mo can suppress to undergo in multi-layer multi-pass welding the intensity decreases during reheating that subsequent passes bring, to toughness Deterioration also has inhibition, but can reduce welding metal toughness when excessive.
The addition of C can improve the intensity of welding metal, but during C excess, the toughness deterioration of welding metal, while to high temperature The sensitiveness of cracking and cold cracking is raised.
Elements of the Mn for needed for ensuring the quenching degree of welding metal, improve intensity.When too high levels, crystal boundary can be increased crisp Change sensitiveness, the toughness deterioration of welding metal.
Ni is transitioned into weld metal substantially so that the not only toughness of the structural constituent but also toughness of welding metal is all improved Only element, while the fatigue strength of weld part is further improved；If but a large amount of additions, the cracking resistance of welding metal Reduce.
Ni is added in the middle of seam organization, due to the effect of solution strengthening, increases the tensile strength of deposited metal.Together When, Ni is austenite former, can prevent weld seam that thick ferrite is formed in high temperature, and plays the work of crystal grain thinning With.Rare earth has the effect of deoxidation, fixed nitrogen, refinement seam organization, the quantity of improvement Welding seam inclusion, size, shape and distribution, So as to improve the toughness of weld metal, and the proportion optimizing of the alloying component such as Mn, Cr, Mo realizes the raising of intensity, impact flexibility Stabilization.
Relative to prior art, a kind of new self-protection flux-cored wire for X80 pipe line steels of the present invention has Following advantage：
Not only there is good welding technological properties and all-position welding adaptability, and the alloying component and new X80 The composition of pipe line steel reaches matched well, and the strong matching such as tensile strength reaches, the discreteness of weld seam low-temperature impact toughness is solved Certainly, pipeline engineering quality is largely improved.
Specific embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases Mutually combination.
In addition to being defined, technical term used has and the invention one of ordinary skill in the art in following examples The identical meanings being commonly understood by.Test reagent used in following examples, unless otherwise specified, is routine biochemistry reagent； The experimental technique, unless otherwise specified, is conventional method.
Below with reference to and describe the present invention in detail in conjunction with the embodiments.
Embodiment 1
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core include as follows The component of weight, Fe2O36Kg；BaCO34Kg；Al-Mg 17Kg；BaF225Kg；CaF216Kg；LiF219Kg；Al2O3 4Kg；Rare earth ferrosilicon 13Kg；Molybdenum-iron powder 1Kg；Manganese metal 4Kg；Crome metal 3Kg；Nickel powder 10Kg.
Its middle rare earth 3.12Kg；Silicon 5.2Kg；Fe is 4.68Kg.
The nickel powder purity is 99.7%.
The flux cored filler rate is 20%.
The Al2O3Its granular size is 110 mesh.
The deposited metal includes the component of following percentage by weight, C 0.01%；Si 0.3%；Mn 1.2%；S 0.015%；P 0.015%；Cr 0.1%；Ni 3.5%；Mo 0.1%；Al 0.6%；Balance of Fe.
Tensile strength (Rm):698MPa；Fracture position：Mother metal；Impact flexibility (- 10 DEG C of test temperature, KV2)：(209、 215、226)J。
Embodiment 2
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core include as follows The component of weight, Fe2O39Kg；BaCO37Kg；Al-Mg 20Kg；BaF220Kg；CaF213Kg；LiF216Kg；Al2O3 10Kg；Rare earth ferrosilicon 9Kg；Molybdenum-iron powder 4Kg；Manganese metal 7Kg；Crome metal 1Kg；Nickel powder 8Kg.
Its middle rare earth 2.25Kg；Silicon 3.87Kg；Fe is 2.28Kg.
The nickel powder purity is 99.8%.
The flux cored filler rate is 25%.
The Al2O3Its granular size is 120 mesh.
The deposited metal includes the component of following percentage by weight, C 0.07%；Si 0.3%；Mn 1.9%；S 0.015%；P 0.015%；Cr 0.1%；Ni 4.1%；Mo 0.1%；Al 1.3%；Balance of Fe.
Tensile strength (Rm):748MPa；Fracture position：Mother metal；Impact flexibility (- 10 DEG C of test temperature, KV2)：(189、 197、192)J。
Embodiment 3
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core include as follows The component of weight, Fe2O37.5Kg；BaCO35.5Kg；Al-Mg 18.5Kg；BaF223Kg； CaF214.5Kg；LiF2 17Kg；Al2O37Kg；Rare earth ferrosilicon 11Kg；Molybdenum-iron powder 2Kg；Manganese metal 5Kg；Crome metal 2Kg；Nickel powder 9Kg.
Its middle rare earth 2.97Kg；Silicon 4.4Kg；Fe is 3.63Kg.
The nickel powder purity is 99.9%.
The flux cored filler rate is 30%.
The Al2O3Its granular size is 115 mesh.
The deposited metal includes the component of following percentage by weight, C 0.04%；Si 0.2%；Mn 1.5%；S 0.01%；P 0.01%；Cr 0.09%；Ni 3.8%；Mo 0.09%；Al 0.9%；Balance of Fe.
Tensile strength (Rm):716MPa；Fracture position：Mother metal；Impact flexibility (- 10 DEG C of test temperature, KV2)：(207、 196、204)J。
Embodiment 4
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core include as follows The component of weight, Fe2O38Kg；BaCO36Kg；Al-Mg 18Kg；BaF221Kg；CaF215Kg；LiF217Kg；Al2O3 6Kg；Rare earth ferrosilicon 12Kg；Molybdenum-iron powder 3Kg；Manganese metal 4Kg；Crome metal 1Kg；Nickel powder 10Kg.
Its middle rare earth 3Kg；Silicon 4.8Kg；Fe is 4.2Kg.
The nickel powder purity is 99%.
The flux cored filler rate is 28%.
The Al2O3Its granular size is 118 mesh.
The deposited metal includes the component of following percentage by weight, C 0.05%；Si 1.18%；Mn 1.7%；S 0.013%；P0.012%；Cr 0.1%；Ni 4%；Mo 0.1%；Al 0.8%；Balance of Fe.
Tensile strength (Rm):727MPa；Fracture position：Mother metal；Impact flexibility (- 10 DEG C of test temperature, KV2)：(192、 196、201)J。
Embodiment 5
A kind of new self-protection flux-cored wire for X80 pipe line steels, including medicine core and crust, the medicine core include as follows The component of weight, Fe2O37Kg；BaCO35Kg；Al-Mg 20Kg；BaF223Kg；CaF214Kg；LiF218Kg；Al2O3 4Kg；Rare earth ferrosilicon 10Kg；Molybdenum-iron powder 4Kg；Manganese metal 4Kg；Crome metal 3Kg；Nickel powder 10Kg.
Its middle rare earth 2.4Kg；Silicon 4.3Kg；Fe is 6.7Kg.
The nickel powder purity is 99.99%.
The flux cored filler rate is 30%.
The Al2O3Its granular size is 120 mesh.
The deposited metal includes the component of following percentage by weight, C 0.03%；Si 0.3%；Mn 1.8%；S 0.015%；P 0.015%；Cr 0.1%；Ni 3.7%；Mo 0.1%；Al 0.7%；Balance of Fe.
Tensile strength (Rm):710MPa；Fracture position：Mother metal；Impact flexibility (- 10 DEG C of test temperature, KV2)：(199、 211、202)J。
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention spirit and principle it Interior, any modification, equivalent substitution and improvements made etc. should be included within the present invention encloses.

Claims (10)

1. a kind of new self-protection flux-cored wire for X80 pipe line steels, it is characterised in that：Including medicine core and crust；
The drug core component includes the component of following parts by weight, Fe2O36-9 parts；Carbonate 4-7 parts；Al-Mg 17-20 parts； Fluoride 49-60 parts；Rare earth ferrosilicon 9-13 parts；Al2O34-10 parts；1-4 parts of molybdenum-iron powder；Manganese metal 4-7 parts；Crome metal 1-3 parts； Nickel powder 8-10 parts.
2. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute State component of the fluoride including following parts by weight, BaF220-25 parts；CaF213-16 parts；LiF216-19 parts.
3. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute Carbonate is stated for BaCO3。
4. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 2, it is characterised in that：Institute Stating drug core component includes the component of following parts by weight, Fe including the drug core component2O38-9 parts；Carbonate 5-7 parts；Al-Mg 19-20 parts；BaF220-23 parts；CaF213-15 parts；LiF216-17 parts；Rare earth ferrosilicon 9-10 parts；Al2O38-10 parts；Molybdenum-iron Powder 3-4 parts；Manganese metal 6-7 parts；Crome metal 1-2 parts；Nickel powder 8-9 parts.
5. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute Component of the rare earth ferrosilicon including following parts by weight is stated, rare earth is the 24-27% of rare earth ferrosilicon total amount；Silicon is rare earth ferrosilicon total amount ≤ 43%；Balance of Fe.
6. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute Component of the molybdenum-iron powder including following parts by weight is stated, molybdenum is 50-70 parts；Balance of iron.
7. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute It is more than 99% to state nickel powder purity.
8. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute Flux cored filler rate is stated for 19-30%.
9. a kind of information self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute Crust is stated using high-quality mild steel, including following percentage by weight composition：C≤0.03%, Mn≤0.35%, Si≤ 0.03%, P≤0.015%, S≤0.015%, balance of Fe.
10. a kind of new self-protection flux-cored wire for X80 pipe line steels according to claim 1, it is characterised in that：Institute State Al2O3Its granular size is 110-120 mesh.
CN201710297229.XA 2017-04-28 2017-04-28 A kind of new self-protection flux-cored wire for X80 pipe line steels Pending CN106925918A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN107378306A (en) * 2017-07-31 2017-11-24 西安理工大学 WH80 steel Self-protecting flux-cored wire and preparation method thereof
CN108544137A (en) * 2018-06-05 2018-09-18 沈阳航空航天大学 A kind of low hydrogen, high toughness self-protection flux-cored wire and preparation method thereof
CN110539105A (en) * 2019-09-27 2019-12-06 常州长海焊材有限公司 flux-cored wire

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CN103962743A (en) * 2014-04-30 2014-08-06 西安理工大学 Welding stick for all-position welding of X100 pipeline steel and manufacturing method thereof
CN105149814A (en) * 2015-10-16 2015-12-16 天津市永昌焊丝有限公司 Self-protection flux-cored wire for steel rail repair welding
CN105345315A (en) * 2015-12-11 2016-02-24 钢铁研究总院 High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline
CN105798485A (en) * 2016-05-31 2016-07-27 西安理工大学 Self-shielded flux-cored wire for X80 pipeline steel and preparation method of self-shielded flux-cored wire

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Publication number Priority date Publication date Assignee Title
CN101745754A (en) * 2009-12-16 2010-06-23 天津大学 Self-protecting flux-cored wire used for all position welding of X80 pipeline steel
CN101913032A (en) * 2010-08-25 2010-12-15 天津市永昌焊丝有限公司 Special self-protection flux-cored wire for resurfacing rail
CN103612033A (en) * 2013-12-05 2014-03-05 天津大桥金属焊丝有限公司 High-toughness self-protection flux-cored welding wire used for X80 pipeline steel welding
CN103962743A (en) * 2014-04-30 2014-08-06 西安理工大学 Welding stick for all-position welding of X100 pipeline steel and manufacturing method thereof
CN105149814A (en) * 2015-10-16 2015-12-16 天津市永昌焊丝有限公司 Self-protection flux-cored wire for steel rail repair welding
CN105345315A (en) * 2015-12-11 2016-02-24 钢铁研究总院 High-Ni-content self-protection flux-cored wire for welding high-steel-grade pipeline
CN105798485A (en) * 2016-05-31 2016-07-27 西安理工大学 Self-shielded flux-cored wire for X80 pipeline steel and preparation method of self-shielded flux-cored wire

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107378306A (en) * 2017-07-31 2017-11-24 西安理工大学 WH80 steel Self-protecting flux-cored wire and preparation method thereof
CN107378306B (en) * 2017-07-31 2019-12-24 西安理工大学 Self-protection flux-cored wire for WH80 steel and preparation method thereof
CN108544137A (en) * 2018-06-05 2018-09-18 沈阳航空航天大学 A kind of low hydrogen, high toughness self-protection flux-cored wire and preparation method thereof
CN110539105A (en) * 2019-09-27 2019-12-06 常州长海焊材有限公司 flux-cored wire
CN110539105B (en) * 2019-09-27 2021-12-24 常州长海焊材有限公司 Flux-cored wire

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