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, 0.010-0.100% rare earth elements, 0.02-3.00% Al, ≤ 0.0200% O, ≤ 0.0050% Ca, ≤ 0.05% P and ≤ 0.05% S, and formed of steel strands with the E-value of ≥ 0.00, which is calculated by the formula : E = [REM] + ([Ti] + [Zr] + [Al])/5 - 9 × ([O] + [Ca]).