Oblon, McClelland, Maier & Neustadt, L.L.P.
Tandem gas-shielded arc welding method
In a tandem gas-shielded arc welding method, carbon dioxide is used as a shielding gas for a leading electrode formed by a solid wire, an argon-carbon dioxide gas mixture containing at least 60% by volume of argon gas is used as a shielding gas for a trailing electrode formed by a solid wire or a flux-cored wire, both the leading electrode and the trailing electrode have a reverse polarity, the leading electrode satisfies the relationships “5.00≦(I·V·10−8)/(Wf·πr2)≦10.00” and “(I2·10−3)/V≧4.50”, and the trailing electrode satisfies the relationships “4.00≦(I·V·10−8)/(Wf·πr2)≦7.00” and “(I2 10−3)/V≧8.00”.
Kobe Steel, Ltd.
B B B B
B23K B23K B23K B23K
inventional inventional inventional inventional
Kei Reiichi Yimin
Yamazaki Suzuki Yuan