| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux-cored wire for two-electrode electrogas arc welding and a two-electrode electrolgas arc welding method providing high strength and toughness of a welded metal even when the heat input exceeds 500 kJ/cm and having excellent welding workability. SOLUTION: A groove in which a surface side is wider than a back side is formed by butting a pair of plates 1 to be welded. A welding wire 11 is installed in a fixing manner with respect to the distal direction of the groove and a welding wire 13 is installed in a reciprocally moving manner. The mean content in each composition of both welding wires is 0.02-0.09% C, 1.5-2.5% Mn, 0.2-0.6% Si, 0.6-1.9% Ni, 0.3-1.2% Mo, 0.10-0.40% Ti, 0.005-0.020% B, 0.10-0.50% Mg, wherein the total of Ni+Mo is 1.2-2.6%, and the mass ratio Mo/Ni of Mo to Ni is 0.25-1.00, and the balance Fe with inevitable impurities and the slag forming agent. COPYRIGHT: (C)2008,JPO&INPIT
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