| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas-shielded metal arc welding method excellent in the blowhole prevention, the gap prevention and the weldability in the high-speed metal are welding of a surface-treated steel sheet. SOLUTION: In the pulse MAG welding using a steel wire for the gas-shielded metal arc welding of a sheet, which has the composition consisting of, by weight, 0.03-0.4% C, 0.5-2.0% Si, 0.2-3.0% Mn, 0.005-0.05% S, 0.003-0.05% O, 0.005-0.4% one or two or more kinds of Al, Ti and Zr in total, 0.05-0.5% one or two or more kinds of Bi, Sb and Se in total, 0.05-3.0% one or two or more kinds of Nb, V and Ta in total, and the balance Fe and inevitable impurities, and in which the electric resistivityρof the wire is 25-50μΩcm, the pulse current Ip is 380-680 A, the pulse time Tp is 0.4-3.0 msec, the base current Ib is 20-100 A, respectively.
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