FLUX-CORED WELDING WIRE FOR GAS SHIELDED ARC WELDING OF FIRE-RESISTANT STEEL

摘要

PROBLEM TO BE SOLVED: To provide a flux-cored welding wire for gas shielded arc welding which is used for welding a steel for fireproof construction which is excellent in fire resistance at 700 to 800°C.;SOLUTION: The welding wire includes, by mass%, 0.002 to 0.2% C, 0.005 to 1% Si, 0.1 to 2.5% Mn, and predetermined amounts of P, S, Al, N with respect to the whole wire. The wire further includes predetermined amounts of one or more elements of Mo, W, Nb, V, Ta, Ti, wherein a Nb equivalent is 0.05 to 0.2%, and includes remainder being Fe and inevitable impurities. A steel outer skin includes 0.002 to 0.2% C, 0.005 to 1% Si, 0.1 to 2.5% Mn, and predetermined amounts of P, S, Al, N, Mo, W, Nb, V, Ta, Ti as the whole outer skin. Filler flux includes predetermined amounts of CaF₂, TiO₂, SiO₂, ZrO₂, Al₂O₃, which are 0.5 to 20% in total, as the whole wire, and remainder being metal powder and inevitable impurities.;COPYRIGHT: (C)2009,JPO&INPIT