Method of direct current electrode positive MAG welding using a wire for direct current electrode positive MAG welding

The MAG welding method with a wire of specific composition and gas mixture stabilizes the arc and reduces spatter, addressing arc instability and spatter issues in thin steel plate welding, ensuring stable and efficient welding.

JP7711803B2Active Publication Date: 2025-07-23JFE STEEL CORP
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Patent Information

Application Number
JP2024080819
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-02-04
Filing Date
2024-05-17
Publication Date
2025-07-23
Estimated Expiration
2043-01-20

AI Technical Summary

Technical Problem

Existing MAG welding methods using a mixed gas of Ar and CO2 as shielding gas face issues with arc instability and increased spatter generation when using straight polarity with a welding wire as the negative electrode, particularly in fillet welding of thin steel plates, leading to welding defects and reduced welding speed.

Method used

A MAG welding method utilizing a welding wire with specific compositions of C, Si, Mn, P, S, Ti, Al, Cr, Ni, Mo, Ca, and REM, along with optional elements like Nb, V, Zr, and K, and a shielding gas mixture of CO2 and O2, stabilizes the arc and reduces spatter generation.

Benefits of technology

The method achieves stable welding with reduced spatter and improved bead shape, suitable for high-speed welding of thin steel plates.

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Abstract

To provide a technology for straight polarity MAG welding which reduces the occurrence of sputtering and also yields an excellent bead shape.SOLUTION: The present invention provides a method that employs a wire for straight polarity MAG welding comprising, in mass%, C: 0.020-0.080%, Si: 0.50-0.97%, Mn: 1.50-2.00%, P: 0.001-0.050%, S: 0.001-0.025%, Ti: 0.10-0.30%, Al: 0.010-0.050%, Cr: 0.05-0.20%, Ni: 0.01-0.10%, Mo: 0.05-0.30%, Ca: 0.0016% or less, REM: 0.020-0.055%, B: 0.0005-0.0030%, N: 0.0100% or less, with the balance being Fe and inevitable impurities, to perform MAG welding using a shield gas, which is a gas where 5-30 vol.% of at least one of CO2 and / or O2 is mixed with at least one of Ar, He and H2.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Steel wire for mag welding and mag welding method using the same

    JP2002144081A

  • Steel wire for carbon dioxide gas shielded arc welding, and welding method using the same

    JP2004249353A

  • Steel strand to form steel wire for carbon dioxide gas-shielded arc welding

    JP2005046879A

  • Steel wire for carbon dioxide gas-shielded arc welding

    JP2005169415A

  • Fillet welding method

    JP2005246386A