STEEL WIRE FOR CARBON DIOXIDE GAS-SHIELDED ARC WELDING, AND WELDING METHOD USING THE SAME

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PROBLEM TO BE SOLVED : To provide a welding wire which can realize spray transfer of droplets, reduce generation of spattering even when high heat input welding is performed, and obtain an excellent bead shape in a carbon dioxide gas-shielded arc welding using shield gas consisting mainly of gaseous carbon dioxide, and a welding method using the welding wire. SOLUTION : Welding is performed with positive polarity by using a steel wire for carbon dioxide gas-shielded arc welding containing, by mass, ≤ 0.20% C, 0.05-2.5% Si, 0.25-3.5% Mn, 0.0010-0.0080% O, 0.015-0.100% rare earth elements, ≤ 0.05% P and ≤ 0.05% S, and formed of steel strands with the D-value of ≥ 0.00, which is calculated by the formula : D = [REM] - 9 × [O] + 0.5.