| 摘要 |
PROBLEM TO BE SOLVED: To provide welding wire capable of satisfying welding operability under the low heat input welding conditions in which welding defects are easily generated since restrictions are placed on heat input in horizontal welding or the like while securing the mechanical properties of weld metal under the welding conditions of high heat input-high interpass temperature in which efficiency is regarded as most important. SOLUTION: The composition of this wire for carbon dioxide gas shielded arc welding including a plated layer is composed of, by mass, 0.005 to 0.09% C, 0.65 to 1.2% Si, 1.5 to 2.2% Mn, 0.15 to 0.30% Ti, 0.05 to 0.30% Cr, 0.12 to 0.22% Mo, 0.0005 to 0.0025% B, <=0.5% Cu and <=2% Ni, and the balance substantially Fe, and also, CEQ is controlled to >=0.40%, and MEQ to 0.10 to 0.20.
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