| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux-cored wire for extra-low hydrogen welding, which achieves the welding of high tensile strength steel having tensile strength in a class of ≥690 MPa under a satisfactory welding operation, and to provide a method for producing the same. SOLUTION: Disclosed is a flux-cored wire for extra-low hydrogen welding obtained by filling flux into an outer skin made of steel, which has a composition comprising, by mass% to the total mass of the wire, 0.04 to 0.20% C, 0.1 to 1.5% Si and 0.6 to 2.5% Mn, comprising one or more kinds selected from Mg, Ca, Al, Zr and rare earth metals by 0.01 to 2.00% in total, and the balance iron with inevitable impurities, and in which the value of PTS=C+Si/24+Mn/6+Cu/15+Ni/15+Cr/5+Mo/5+V/5(%) is 0.36 to 1.0 mass% to the whole wire, the total hydrogen content in the wire is ≤6.0 ppm by the mass ratio of the whole wire, and the outer skin made of steel has no slit-shaped joints having the risk of air infiltration. COPYRIGHT: (C)2010,JPO&INPIT
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