CN1191914C - Welding rod contg. titanium dioxide series flux for CO2 gas arc welding - Google Patents

Welding rod contg. titanium dioxide series flux for CO2 gas arc welding Download PDF

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Publication number
CN1191914C
CN1191914C CNB011234652A CN01123465A CN1191914C CN 1191914 C CN1191914 C CN 1191914C CN B011234652 A CNB011234652 A CN B011234652A CN 01123465 A CN01123465 A CN 01123465A CN 1191914 C CN1191914 C CN 1191914C
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China
Prior art keywords
welding
content
welding rod
arc welding
titanium oxide
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Expired - Lifetime
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CNB011234652A
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CN1334173A (en
Inventor
金龙德
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Hyundai Welding Co Ltd
Hyundai Metal Co Ltd
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Hyundai Welding Co Ltd
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Publication of CN1334173A publication Critical patent/CN1334173A/en
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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
    • B23K35/02—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
    • B23K35/36—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
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas

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

Abstract

Provided is a flux cored wire containing titanium oxides for CO2 gas shielded arc welding. The flux cored wire containing titanium oxides for CO2 gas shielded arc welding comprises C 0.03-0.07%, Mn 1.6-2.0%, Si 0.35-0.7%, Mg 0.5-1.1%, B 0.005-0.02%, Al 0.08-0.3%, Ni 0.7-2.0%, F 0.15-0.35%, titanium oxides 5.5-7.5%, 0.25% or less of at least two non-titanates selected from SiO2, Al2O3 and ZrO2, a balance of Fe and other inevitable impurities. The total content of titanate and non-titanate is controlled below 8.0%, based on the total weight of the flux cored wire. The provided flux cored wire containing titanium oxides for CO2 gas shielded arc welding has superior impact toughness at low thermal temperature and excellent all position welding.

Description

Co3 gas arc welding connects with the welding rod that contains TiO 2 series solder
Technical field
The present invention relates to co3 gas arc welding connects with the welding rod that contains TiO 2 series solder.In more detail, it is good to the present invention relates to all-position welding, particularly the low-temperature flexibility good carbon dioxide gaseous arc welding welding rod that contains TiO 2 series solder.
Background technology
Use the welding rod that contain TiO 2 series solder of carbon dioxide as protective gas, with its good weld job, particularly good welding bead outward appearance and welding efficiency etc. are widely used in mild steel and high works welding of opening the degree steel.
Yet in general, the above-mentioned welding rod that contains TiO 2 series solder forms agent as slag inclusion, owing to contain a large amount of oxides such as titanium dioxide, so slag inclusion has acidity.And; because of protective gas decomposites oxygen, make that the oxygen content of weld metal inside is 700～900 ppm by weight scopes, it has good impact characteristics-20～-30 ℃ of temperature ranges; and can not get good impact characteristics-60～-80 ℃ of temperature ranges, therefore need overcome above-mentioned shortcoming.
For solving the problem of above-mentioned conventional art, Korea S special permission communique 88-2508 has disclosed an invention.It is TiO that this invention provides each components contents 2: 4～8.5%, Mg:0.2～0.8%, Ti:0.03～0.7%, B:0.002～0.025%, Mn:1.0～3.0%, Si:0.1～1.2%, F:0.1～0.30% and contain TiO 2Oxide be lower than 8.5% the welding rod that contains solder flux.That is, it is characterized in that in the foregoing invention having good impact flexibility when guaranteeing-60 ℃, control contains Mg in the welding rod of solder flux, Ti, the content of alloying components such as B.
But the invention of above-mentioned special permission communique also exists, and to welding calorific requirement little condition, can obtain desired rerum natura, and the welding high slightly to calorific requirement, then can not get the problems such as weld metal of good impact flexibility.
Other example can be enumerated day flat 3-291192 of disclosure special permission communique.This invention provides TiO 2: 2.5～6.5%, F:0.36～1.5%, Mn:1.0～3.0%, Si:0.2～1.0%, Mg:0.1～1.0% and contain TiO 2Oxide add up to and to be lower than 8.0% solder flux of forming and to be filled to welding rod in the metal sheath.
But above-mentionedly openly specially permit in the communique generation that the diffusivity hydrogen of weld metal takes place for control, increased the amount of metal fluoride, therefore cause the increase of smog and sputter in the welding, weldability is bad.
Summary of the invention
For this reason, the present invention proposes for the problems that solve above-mentioned conventional art, promptly provides arc welding with good low temperature impact flexibility and good all-position welding with the welding rod that contains TiO 2 series solder.
The present inventor is to carrying out big quantity research than the welding under higher heating condition and the carbon-dioxide protecting gas; develop and have low-temperature impact toughness and the good welding rod that contains the titanium dioxide tin solde of weld job; it is following and below the 50ppm that its result can provide in the weld metal oxygen and nitrogen content to maintain 550ppm respectively; suppress by the miniaturization promotion of crystalline structure and the generation of non-metallic inclusion, obtain also having the weld metal of good low-temperature toughness in the low temperature field.
And then the present inventor also expects, not only above-mentioned low-temperature impact property, and to satisfy weld job simultaneously, various oxide contents are necessary in the control components of welding electrode, thereby have finished the present invention.
Therefore, the present invention relates to co3 gas arc welding and connect, it is characterized in that with respect to welding rod with the welding rod that contains TiO 2 series solder, each components contents weight % is C:0.03～0.07%, Mn:1.6～2.0%, Si:0.35～0.7%, Mg:0.5～1.1%, B:0.005～0.02%, Al:0.08～0.3%, Ni:0.7～2.0%, F:0.15～0.35%, titanium oxide: 5.5～7.5%, SiO 2, Al 2O 3And ZrO 2It is low by 0.25% to select one or more component contents to add up in the non-titanium oxide of forming, and all the other are iron and other unavoidable impurities, and the total amount of controlling above-mentioned titanium oxide and non-titanium oxide is lower than 8.0%.
The following describes the reason of the constituent content of restriction welding rod of the present invention.
C promotes the acicular ferrite structure of weld metal to form, and as the element of miniaturization crystalline structure, can improve the impact flexibility of weld metal effectively.But when C content is lower than 0.03 weight % (hereinafter to be referred as %) of welding rod total amount, can not get above-mentioned effect; When the content of C surpasses 0.07%, form a large amount of carbide, intensity excessively rises, and impact flexibility reduces.Therefore, preferably to control C content be 0.03～0.07% in the present invention.
Mn not only can improve the slag inclusion flowability, improves weld bead shape, and promotes the deoxidation of weld metal, keeps the suitable intensity and the toughness of welding position.But when Mn content is lower than 1.6%, can not get above-mentioned effect; When Mn content surpassed 2.0%, intensity increased and produces the toughness reduction, and particularly low-temperature flexibility sharply descends.Therefore preferably to control Mn content be 1.6～2.0% in the present invention.
Si is identical with Mn, can improve weld bead shape, when promoting the deoxidation of weld metal, improves intensity.But when Si content is lower than 0.35%, can not get desired effects; When Si content surpassed 0.7%, intensity increased and produces the toughness reduction, and particularly toughness significantly reduces on the low temperature field.Therefore, preferably to control Si content be 0.35～0.7% in the present invention.
Mg is effective oxygen content that reduces in weld metal, obviously improve the element of the low-temperature flexibility of weld metal.Therefore, the fracture transition temperature of the high more weld metal of Mg content is low more, thus the impact flexibility of significantly improving.But when Mg content is too much, owing to too much generate the MgO slag inclusion, reduces flowability, thereby reduce the slag inclusion foreskin, can not get good welding bead outward appearance.Therefore, preferably to control the content of Mg be 0.5～1.1% in the present invention.
B forms B or BN in weld metal, improve the element of impact flexibility.But when B content is lower than 0.005%, can not get expecting effect; When B content surpassed 0.02%, the hardening tissue increased in the weld metal, thereby sharply reduces impact flexibility.Therefore, preferably to control B content be 0.005～0.02% in the present invention.
Al is the element that promotes the weld metal deoxidation, and as the element that increases weld metal viscosity and the comprehensive weldability of raising, forms nitride AlN with the nitrogen reaction, thereby suppress the activity of the free nitrogen in the weld metal, and the impact flexibility under the raising low temperature.But when Al content is lower than 0.08%, can not get desired effects; When Al content surpasses 0.3%,, reduce the ductility and the impact flexibility of weld metal at the inner numerous Al compound that forms of weld metal.Therefore, preferably to control the content of Al be 0.08～0.3% in the present invention.
Ni reduces the fracture transition temperature of weld metal as the forming element of austenite structure.But when Ni content is lower than 0.7%, can not get desired effects: when Ni content surpasses 2.0%, keep necessary strength, but reduce low-temperature impact toughness.Therefore, preferably to control Ni content be 0.7～2.0% in the present invention.
F improves the electric arc centrality, and fusing when increasing welding by extensive formation recrystallizationization field, promotes the miniaturization of weld structure, improves the element of low-temperature impact toughness, and promotes dehydrogenation, further improves low-temperature impact toughness.But when F content is lower than 0.15%, can not get expecting effect: when F content surpasses 0.35%, the generation of sputter and smog when not only increasing welding, and the mobile significantly deterioration of slag inclusion, welding welding bead outward appearance is bad.So it is 0.15～0.35% that the present invention preferably controls F content.
In addition, F can be by NaF among the present invention, K 2SiF 6, Na 3AlF 6, CaF 2Fluoride in alkali metal or alkaline-earth metal provides.
And welding rod of the present invention contains oxide.
Titanium oxide is the main component that contains slag inclusion and arc stabilizer in the welding rod of TiO 2 series solder, and the weld job of slag inclusion foreskin, fissility, weld bead shape etc. is had a significant impact.
The present invention preferably controls TiO 2For the content of the titanium oxide of benchmark is 5.5～7.5%.This is because work as TiO 2Content is lower than at 5.5% o'clock, and the foreskin of slag inclusion is bad, can not get good welding bead outward appearance, the all-position welding difficulty; Work as TiO 2Content surpasses at 7.5% o'clock, and the slag inclusion growing amount is many, and viscosity increases, and causes that the slag inclusion in the weld metal inside is sneaked into, and increases the oxygen content of weld metal, reduces low-temperature flexibility.In addition, above-mentioned titanium oxide is provided by natural rutile, reproducibility ilmenite etc. among the present invention.
Welding rod of the present invention contains the SiO that forms agent as slag inclusion 2, Al 2O 3And ZrO 2Deng non-titanium oxide, preferably control in these oxides one or more composition its add up to content to be lower than 0.25%.This is because when the total content of mentioned component was lower than 0.25%, slag inclusion viscosity improved, and obtains good welding bead outward appearance: and when the total content of mentioned component surpassed 0.25%, welding bead was coarse.
In addition, the total amount of above-mentioned titanium oxide of control and non-titanium oxide is lower than 8.0% among the present invention, because surpass at 8.0% o'clock, sputter enlarges markedly, thereby the efficient of weld job significantly descends.
In addition, CaF among the present invention 2As alkali earth metal fluoride, be used for deoxidier and dehydrogenating agent.When containing these compositions,, improve welding efficiency, preferably control its content and be lower than 0.2% for guaranteeing better sputter.And, can contain micro-Na, K, arc stabilizers such as Li among the present invention.
The specific embodiment
Embodiment
Form according to following table 1, prepare the welding rod that contains TiO 2 series solder of diameter 1.4mm respectively.Then, use above-mentioned welding rod, on welding base metal JISG3126 SLA325B, weld, concrete welding condition such as following table 2.
[table 1]
Distinguish The composition of welding rod (weight %)
C Mn Si Mg B Al Ni F Titanium oxide (TiO 2) Non-titanium oxide CaF 2
SiO 2 ZrO 2 Al 2O 3
Embodiment 1 0.050 1.9 0.45 0.80 0.006 0.15 1.50 0.18 6.5 0.1 0.1 - -
2 0.031 2.0 0.38 0.50 0.01 0.10 1.85 0.20 5.5 0.05 0.1 0.1 0.05
3 0.035 1.8 0.50 0.90 0.01 0.08 1.55 0.31 5.9 0.1 0.1 - 0.1
4 0.045 1.7 0.40 0.95 0.015 0.25 1.45 0.15 6.0 - 0.1 - -
5 0.036 1.9 0.70 0.62 0.008 0.11 1.25 0.22 6.2 - 0.1 0.1 0.15
6 0.041 1.6 0.35 1.10 0.015 0.15 1.00 0.35 7.4 - 0.1 - -
7 0.039 1.6 0.45 0.90 0.01 0.30 0.70 0.25 6.8 0.1 0.1 0.05 -
8 0.060 1.8 0.50 0.80 0.02 0.15 0.90 0.28 7.0 - - 0.1 0.20
9 0.033 1.8 0.45 0.75 0.01 0.10 1.30 0.16 6.5 0.2 - - 0.05
10 0.037 1.7 0.55 0.70 0.01 0.15 1.85 0.19 6.0 - - 0.2 -
Comparative example 1 0.035 1.9 0.45 0.80 0.006 0.15 1.50 0.20 4.1 1.0 0.1 - -
2 0.021 1.8 0.41 0.30 0.01 0.20 1.80 0.20 5.4 0.5 0.1 0.1 -
3 0.025 1.8 0.50 0.90 0.01 0.50 1.55 0.30 5.9 - - - -
4 0.037 2.4 0.55 0.70 0.01 0.15 1.45 0.20 6.0 - - - 0.1
5 0.046 1.9 0.40 0.95 0.015 0.25 0.40 0.15 5.8 0.5 - - -
6 0.041 1.7 0.20 1.00 0.02 0.25 1.90 0.30 6.0 0.2 - - -
7 0.010 1.8 0.70 1.05 0.008 0.15 1.25 0.20 6.5 1.5 0.2 0.2 -
8 0.052 1.6 0.45 1.30 0.01 0.10 1.50 0.16 6.0 - - 0.3 -
9 0.049 1.6 0.35 1.10 0.015 0.15 1.00 0.50 7.4 - - - 0.3
10 0.031 1.8 0.45 0.80 0.003 0.15 1.60 0.20 5.5 1.0 0.2 - -
11 0.030 1.6 0.90 0.90 0.01 0.30 1.70 0.25 6.5 - 0.1 0.2 -
*Remainder is iron and unavoidable impurities in the above-mentioned table.
[table 2]
Polarity Welding current/voltage Speed of welding Protective gas The groove shape The lamination method
DCRP (direct current antipolarity) / 35 volts of 350 peaces 25～35 cm per minute CO 225 liters/minute 20 ° of welding root 16mm gap 9mm 5 layers 10 times
After implementing above-mentioned welding, in order to estimate the low-temperature flexibility of weld metal, adopting with ASTMA370 is the Cha Baishi impact test of benchmark, this result of the test such as following table 3.
And the weld job in the above-mentioned welding is estimated in perusal, electric arc, sputter and welding bead outward appearance, its result such as following table 3.Represent the good of its evaluation result with ◎ here, zero expression is common, and △ represents bad.
Shown in following table 3,, all represent good low-temperature impact toughness and weld job for the embodiment of the invention (1～10) that oxygen in the weld metal and nitrogen content reduce and the weld job raising proposes.
Particularly, contain specified amount CaF 2The embodiment of the invention (2～3,5,8～9) and other embodiment relatively, have better sputter.
[table 3]
Distinguish Tension test Cha Baishi absorbs energy (J) Weld job
Yield point (N/mm 2) Hot strength (N/mm 2) Percentage elongation (%) vE-40℃ vE-60℃ vE-80℃ Electric arc Sputter The welding bead outward appearance
Embodiment 1 555 590 26.0 144 111 84 ◎ ○ ◎
2 585 610 25.8 126 105 72 ◎ ◎ ◎
3 565 595 27.0 155 122 101 ◎ ◎ ◎
4 540 580 27.5 161 134 104 ◎ ○ ◎
5 564 594 25.6 128 101 68 ◎ ◎ ◎
6 536 674 27.6 142 114 85 ◎ ○ ◎
7 524 565 26.7 121 98 65 ◎ ○ ◎
8 531 567 25.2 146 110 89 ◎ ◎ ◎
9 542 571 26.5 138 106 78 ◎ ◎ ◎
10 574 615 25.2 125 103 69 ◎ ○ ◎
Comparative example 1 540 575 27.0 154 114 101 △ ○ △
2 565 601 26.2 92 45 26 △ ○ △
3 610 655 21.5 85 41 24 ◎ ○ △
4 604 642 22.4 98 52 31 ◎ ◎ △
5 542 574 28.1 104 51 28 ◎ ○ △
6 515 544 29.4 112 65 35 △ ○ ○
7 574 595 26.8 64 37 21 ◎ ○ △
8 557 594 24.2 156 121 103 △ ○ △
9 545 585 26.2 148 104 96 ○ △ △
10 546 579 28.0 65 46 35 ◎ ○ △
11 610 667 21.0 55 33 18 ◎ ○ △
In contrast, at the comparative example 1 of the scope of the invention, though its notched bar impact strength is good, weld job is not poor for the content of titanium oxide.And, the comparative example 2 that Mg content is very few, its impact flexibility is bad.On the contrary, though the impact flexibility of the too much comparative example 8 of Mg content is good, weld job is bad.
And then, Al, Mn, Ni, the content of Si is not respectively at the comparative example (3～6,11) of the scope of the invention, and all-60, under-80 ℃ of temperature, its notched bar impact strength is insufficient.
At the comparative example 10 of the scope of the invention, its notched bar impact strength is not bad-40 ℃ of temperature ranges yet for comparative example 7 that C content is very few and B content.
Therefore, the invention described above obtains the weld metal of excellent in low temperature toughness by reducing oxygen and nitrogen content in the weld metal, but and provides the welding rod that contains solder flux of the all-position welding of good welds operation.

Claims (2)

1. co3 gas arc welding connects with the welding rod that contains TiO 2 series solder, it is characterized in that, with respect to welding rod, each components contents weight % is C:0.03～0.07%, Mn:1.6～2.0%, Si:0.35～0.7%, Mg:0.5～1.1%, B:0.005～0.02%, Al:0.08～0.3%, Ni:0.7～2.0%, F:0.15～0.35%, titanium oxide: 5.5～7.5%, SiO 2, Al 2O 3And ZrO 2Select one or more to become subtotaling content for being lower than 0.25% in the non-titanium oxide of forming, all the other are iron and other unavoidable impurities component, and the total amount of controlling above-mentioned titanium oxide and non-titanium oxide is lower than 8.0%.
2. the described CO 2 gas-shielded arc welding of claim 1 is characterized in that also containing the CaF below 0.2% with the welding rod that contains TiO 2 series solder 2
CNB011234652A 2000-07-25 2001-07-25 Welding rod contg. titanium dioxide series flux for CO2 gas arc welding Expired - Lifetime CN1191914C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR42675/2000 2000-07-25
KR10-2000-0042675A KR100502571B1 (en) 2000-07-25 2000-07-25 Flux cored wire for co2 gas shielded arc welding

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Publication Number Publication Date
CN1334173A CN1334173A (en) 2002-02-06
CN1191914C true CN1191914C (en) 2005-03-09

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100532243B1 (en) * 2001-12-17 2005-11-30 현대종합금속 주식회사 A gas shield arc welding flux cored wire
JP3816070B2 (en) * 2003-09-16 2006-08-30 株式会社神戸製鋼所 Titanya flux cored wire
KR100578750B1 (en) * 2003-12-10 2006-05-12 고려용접봉 주식회사 Metal-based flux cored wire having excelent weldability for high tensile strength steel
KR100909022B1 (en) 2007-12-27 2009-07-22 현대종합금속 주식회사 Titania-based Flux Filling Wire for Gas Shield Arc Welding
KR101012888B1 (en) * 2008-10-24 2011-02-10 양웅섭 Loss of belongings prevention bag
JP5314414B2 (en) * 2008-12-22 2013-10-16 株式会社神戸製鋼所 Flux cored wire
JP5351641B2 (en) * 2009-07-23 2013-11-27 株式会社神戸製鋼所 Flux cored wire
CN105033506B (en) * 2015-08-24 2017-09-12 句容亿格纳米材料厂 Potassium titanate welding rod additive and preparation method thereof

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JPS5944159B2 (en) * 1981-06-05 1984-10-26 株式会社神戸製鋼所 Flux-cored wire for gas shield arc welding
JP2908585B2 (en) * 1991-04-09 1999-06-21 日鐵溶接工業株式会社 Flux-cored wire for gas shielded arc welding
JPH07276088A (en) * 1994-04-04 1995-10-24 Nippon Steel Corp Mag welding flux cored wire for low temperature steel
JPH10249583A (en) * 1997-03-05 1998-09-22 Nippon Steel Weld Prod & Eng Co Ltd Flux cored wire for gas shielded arc welding
KR100294454B1 (en) * 1997-03-27 2002-11-18 가부시키 가이샤 고베세이코쇼 Flux-cored wire for electrogas arc welding
KR100265097B1 (en) * 1997-08-08 2000-09-01 구마모토 마사히로 Flux-cored wire for arc welding

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KR20020008681A (en) 2002-01-31
KR100502571B1 (en) 2005-07-22

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