US20060213874A1 - Shielding gases for mag-welding of galvanized steel sheets and welding method using the same - Google Patents

Shielding gases for mag-welding of galvanized steel sheets and welding method using the same Download PDF

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Publication number
US20060213874A1
US20060213874A1 US11/376,088 US37608806A US2006213874A1 US 20060213874 A1 US20060213874 A1 US 20060213874A1 US 37608806 A US37608806 A US 37608806A US 2006213874 A1 US2006213874 A1 US 2006213874A1
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United States
Prior art keywords
welding
volume
pits
blowholes
galvanized steel
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Abandoned
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US11/376,088
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English (en)
Inventor
Katsunori Wada
Toshikazu Kamei
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Taiyo Nippon Sanso Corp
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Taiyo Nippon Sanso Corp
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Assigned to TAIYO NIPPON SANSO CORPORATION reassignment TAIYO NIPPON SANSO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMEI, TOSHIKAZU, WADA, KATSUNORI
Publication of US20060213874A1 publication Critical patent/US20060213874A1/en
Priority to US11/976,121 priority Critical patent/US7718915B2/en
Abandoned legal-status Critical Current

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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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode

Definitions

  • the present invention relates to a MAG (metal active gas) welding method of a galvanized steel sheet wherein corrosion proofing is provided on the surface of the steel sheet.
  • the galvanized steel sheet is a sheet in which galvanization is conducted on an iron base surface of a steel sheet.
  • Zinc is removed mechanically in advance from a line on which welding should be conducted.
  • the number of steps for welding increase due to the addition of steps for removing zinc from the line, and this causes a problem in that the cost increases due to the addition of the steps.
  • a method is proposed, for example, in Japanese Patent No. 2668125, wherein generation of pits and blowholes is prevented by using a mixed gas consisting of oxygen, carbon dioxide, and argon, which occupies the residual volume of the mixed gas, for welding.
  • the mixed gas is used in order to prevent an occurrence of a zinc vapor by the effect of oxidation of zinc caused by oxygen.
  • a method is proposed wherein generation of pits and blowholes is prevented due to the effect that surface tension of the molten metal is decreased due to oxygen and gases pores included in a molten metal rise to the surface easily.
  • the disclosed welding speed thereof is only 120 cm/min.
  • the purpose of the present invention is to provide a shielding gas which does not generate pits and blowholes in a welded portion when a lap fillet welding or the like of a galvanized steel sheet is conducted in a MAG welding method.
  • a first aspect of the present invention is a shielding gas for MAG welding wherein a carbon steel solid wire is used for lap fillet welding of a galvanized steel sheet; wherein the shielding gas is a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.
  • composition of the mixed gas is 8.5 to 12% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.
  • a second aspect of the present invention is a method for MAG welding of a galvanized steel sheet, wherein a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon, is used as a shielding gas to conduct a lap fillet welding for a galvanized steel sheet by using a carbon steel solid wire.
  • composition of the mixed gas is 8.5 to 12% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.
  • FIG. 1 is a schematic view which shows a welding state of a concrete example.
  • FIG. 2 is a photograph which shows a cross section of a bead of a concrete example.
  • FIG. 3 is a photograph which shows a cross section of a bead of a concrete example.
  • FIG. 4 is a photograph which shows a cross section of a bead of a concrete example.
  • a mixed gas composition consisting of 8 to 15% by volume of oxygen, preferably 8.5 or more and/or 12% by volume or less, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon, that is 72 to 55% by volume of argon, is used as a shielding gas.
  • the shielding gas of the present invention can be used for a MAG welding method wherein welding such as lap fillet welding is conducted for a galvanized steel sheet and a carbon steel solid wire is used preferably.
  • an oxygen concentration in the shielding gas when an oxygen concentration in the shielding gas is less than 8% by volume, pits and bow holes tend to be produced to decrease the strength of a welded portion.
  • the oxygen concentration in the shielding gas exceeds 15% by volume, pits and blowholes tend to be produced and the strength of a welded portion tend to become insufficient.
  • a concentration of carbon dioxide is less than 20% by volume, pits and blowholes tend to be produced and the strength of a welded portion tend to become insufficient.
  • the concentration of carbon dioxide is over 30% by volume, pits and blowholes tend to produced and the strength of a welded portion tend to become insufficient.
  • Discharge flow rate of the shielding gas from a welding torch is set in the range of 15 to 25 liters/minute in general, but it is not necessary in the invention to limit this rate in this range as long as the shielding gas can cover the surface of a molten pool.
  • any kinds and conditions of a galvanized steel sheet can be used as a base metal which is welded in the present invention, and it is not particularly limited. Furthermore, in addition to the case that two or more sheets of galvanized steel are welded using the shielding gas of the present invention, such a case that the shielding gas of the present invention is used for welding a galvanized steel sheet to another type of a steel sheet(s) can also be included in the scope of the present invention.
  • a welding wire such as YGW-17, YGW-18 and YGW-19, which is provided according to JIS (Japanese Industrial Standard) Z-3312 “solid wire used for MAG welding of a mild steel and a high strength steel” can be used in the present invention.
  • Conditions for lap fillet welding are not particularly limited in the present invention, since lap fillet welding is a well-known method and any general conditions thereof are applicable in the present invention.
  • the MAG welding method is also a well-known welding method wherein arc welding is conducted using an active gas such as carbon dioxide as a shielding gas.
  • the method can be conducted using a commercially available MAG welding machine.
  • the aforementioned mixed gas including three kinds of gases is used as the shielding gas.
  • Welding arc voltage in MAG welding is generally about 14 to 36 V and welding current, which is used to provide a heat required for welding, is generally about 40 to 350 A. In the present invention, such conditions can be used but are not limited only thereto.
  • the shielding gas of the present invention Due to the use of the shielding gas of the present invention, occurrence of defects such as blowholes and pits in a welding portion can be reduced. Furthermore, the welding speed can be increased. For example, a welding speed of 125 cm/min or more is possible. For example, by increasing the welding current, the welding speed can be increased to about 200 cm/min without occurrence of blowholes and pits. It is possible to further increase the welding speed to, for example, 250 cm/min or 300 cm/min or more, by adjusting the welding conditions. Specific examples of the welding speed of the invention are for example, 0 to 250 cm/min, 100 to 200 cm/min, 100 to 190 cm/min and the like, but the rate is not only limited thereto.
  • Example 1 two galvanized steel sheets 1 having a sheet thickness of 2.3 mm were used for Example 1.
  • a clearance gap t between an upper galvanized sheet and a lower galvanized sheet was set to 0 mm, and an slope angle ⁇ of a torch 2 was provided at 30°.
  • MAG welding was conducted so that a length of a welded portion became 250 mm while welding speed was varied, and occurrence and state of pits and blowholes were confirmed.
  • MAG weldings were conducted such that a mixed gas consisting of argon gas, carbon dioxide gas and oxygen gas was used and the composition of the mixed gas (volume %) was varied.
  • Welding method consumable electrode welding, pulsed arc welding
  • Welding wire a wire according to JIS YGW-17, diameter 1.2 mm
  • Example 1 the welding speed was varied while the welding current and total feed of wire were maintained at fixed values.
  • Results obtained from the evaluations are shown in Tables 1 and 2 and FIG. 2 .
  • FIG. 2 is a photograph of the aforementioned cross section of the bead.
  • Welding speed (cm/min) 100 125 150 175 Acceptability Ar—20% CO 2 0 1 3 34 Non-acceptable Ar—20% CO 2 —7.5% O 2 0 0 3 13 Non-acceptable Ar—20% CO 2 —8% O 2 0 0 1 3 Non-acceptable Ar—20% CO 2 —8.5% O 2 0 0 0 2 Acceptable Ar—20% CO 2 —12% O 2 0 0 0 0 Acceptable Ar—20% CO 2 —15% O 2 0 0 1 8 Non-acceptable Ar—30% CO 2 —8% O 2 0 0 3 8 Non-acceptable Ar—30% CO 2 —8.5% O 2 0 1 2 0 Acceptable Ar—30% CO 2 —12% O 2 0 0 0 1 Acceptable Ar—30% CO 2 —12% O 2 0 0 0 1 Acceptable Ar—30% CO 2 —12% O
  • Example 1 the welding current was fixed at 225 A.
  • the welding current is fixed at 225 A even in a case of the welding speed of 175 cm/min or more, welded metal shortage may be caused, and therefore insufficient depth and leg length may be caused.
  • the welding speed can be increased due to an increase of welding current.
  • Example 2 MAG welding was conducted similar to in Example 1 except that the torch slope angle, welding speed, arc voltage, and welding current were changed as follows. Clearance gap t between an upper sheet and a lower sheet was set to 1 mm.
  • Table 3 and FIG. 3 represent comparisons between a case wherein a shielding gas consisting of 20% by volume of carbon dioxide, 12% by volume of oxygen and residual % by volume of argon was used and a case wherein a general shielding gas consisting of 20% by volume of carbon dioxide and residual % by volume of argon, wherein gaseous oxygen was not included therein, was used.
  • Table 4 and FIG. 4 represent comparisons between a case wherein a shielding gas consisting of 30% by volume of carbon dioxide, 12% by volume of oxygen and residual % by volume of argon was used and a case wherein aforementioned general shielding gas was used.
  • a sign “ ⁇ ” in the column for pits represents that pits are not generated at all; a sign “ ⁇ ” represents that some pits are generated but the number of pits is smaller than the reference number; a sign “ ⁇ ” represents that pits are generated and the number thereof is somewhat larger than the reference number; and a sign “ ⁇ ” represents that a lot of pits are generated.
  • a sign “ ⁇ ” in the column for blowholes represents that blowholes are not generated at all; a sign “ ⁇ ” represents that blowholes are generated at the welding speed of 175 cm/min or more; and a sign “ ⁇ ” represents that blowholes are generated at the welding speed of 125 cm/min or 150 cm/min or more.
  • a shielding gas for MAG welding wherein the gas is a mixed gas of three kinds consisting of 8 to 15% by volume of oxygen, preferably 8.5 to 12% by volume, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon. Furthermore, due to the effect of the shielding gas, the welding speed can be increased, for example, a welding speed of 125 cm/min or more is possible.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
US11/376,088 2005-03-28 2006-03-16 Shielding gases for mag-welding of galvanized steel sheets and welding method using the same Abandoned US20060213874A1 (en)

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US11/976,121 US7718915B2 (en) 2005-03-28 2007-10-22 Shielding gases for MAG-welding of galvanized steel sheets and welding method using the same

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JPP2005-091198 2005-03-28
JP2005091198A JP4006009B2 (ja) 2005-03-28 2005-03-28 亜鉛めっき鋼板のｍａｇ溶接用シールドガスおよびこのシールドガスを使用した溶接方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130180959A1 (en) * 2010-09-24 2013-07-18 Renishaw Plc Method of forming an optical device
US20150027995A1 (en) * 2012-03-09 2015-01-29 Daihen Corporation Solid wire, and gas-shielded arc welding method using same

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JP5037893B2 (ja) 2006-10-03 2012-10-03 株式会社エヌ・ティ・ティ・ドコモ Ｃｑｉ通知方法およびユーザ端末
EP2380696A4 (en) * 2008-12-26 2016-11-30 Nippon Steel & Sumitomo Metal Corp STAINLESS STEEL FILLED ELECTRODE WELDING WIRE FOR WELDING GALVANIZED STEEL SHEETS AND METHOD FOR ARC WELDING GALVANIZED STEEL SHEETS USING THE SAME
CN102513663A (zh) * 2011-12-28 2012-06-27 上海宝钢车轮有限公司 钢制车轮焊接用保护气体
CN103008846B (zh) * 2012-12-10 2016-01-06 南车四方车辆有限公司 低碳高强度钢的焊接方法
CN104475927B (zh) * 2014-10-15 2016-08-24 洛阳隆华传热节能股份有限公司 一种用二氧化碳与氩气混合气体保护对空冷凝汽器单排管与管板的焊接方法
JP6023156B2 (ja) * 2014-11-27 2016-11-09 日新製鋼株式会社 Ｚｎ系めっき鋼板のアーク溶接方法
JP6617443B2 (ja) * 2015-06-22 2019-12-11 マツダ株式会社 金属部材の溶接方法
CN112122748A (zh) * 2020-09-07 2020-12-25 上海交通大学 一种抑制镀锌板焊接气孔的焊接方法
CN114453712A (zh) * 2021-12-06 2022-05-10 河钢股份有限公司 三元混合型保护气体在熔化极气体保护焊中的应用

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139506A (en) * 1958-10-28 1964-06-30 Linde Eismasch Ag Protective gas mixture for light arc welding with a fusible blank wire electrode

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2668125B2 (ja) 1988-07-28 1997-10-27 トヨタ自動車株式会社 亜鉛メッキ鋼板の溶接方法
JPH05329682A (ja) 1992-05-26 1993-12-14 Sumitomo Metal Ind Ltd 亜鉛系めっき鋼板の溶接ワイヤおよび溶接方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139506A (en) * 1958-10-28 1964-06-30 Linde Eismasch Ag Protective gas mixture for light arc welding with a fusible blank wire electrode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130180959A1 (en) * 2010-09-24 2013-07-18 Renishaw Plc Method of forming an optical device
US10226840B2 (en) * 2010-09-24 2019-03-12 Renishaw Plc Method of forming an optical device
US20150027995A1 (en) * 2012-03-09 2015-01-29 Daihen Corporation Solid wire, and gas-shielded arc welding method using same
US9616528B2 (en) * 2012-03-09 2017-04-11 Kobe Steel, Ltd. Solid wire, and gas-shielded arc welding method using same

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CN1840283B (zh) 2010-05-12
CN1840283A (zh) 2006-10-04
MY137853A (en) 2009-03-31
JP4006009B2 (ja) 2007-11-14
US20080053966A1 (en) 2008-03-06
JP2006272351A (ja) 2006-10-12
US7718915B2 (en) 2010-05-18

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Owner name: TAIYO NIPPON SANSO CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WADA, KATSUNORI;KAMEI, TOSHIKAZU;REEL/FRAME:017650/0759

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STCB Information on status: application discontinuation

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