| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal based flux cored wire which excels in hot crack resistance and weldability and which enables a weld zone superior in mechanical performance particularly in toughness, in carrying out gas shielded arc welding for a butt joint with small pass and large heat input, and also to offer a one-side welding method using this wire. SOLUTION: This is a metal based flux cored wire for gas shielded arc welding, and includes flux F filled in a steel outer skin M. It contains, in weight % against the total wire weight, 2.0-3.0% Mn, 0.30-0.90% Si, 0.3-2.0% Ni, 0.10-0.50% Ti, and 0.0020-0.0070% B. In addition, the wire composition is such that Xc=Mn/(Si+50B) satisfies 2.20 to 7.50 and that Xi=(Mn+Ni+100 B)/[10×(Ti-0.3)<2> +Si] meets 3.5 to 15.0; and, the flux filling rate is designed to be 10.0 to 25.0% of the total wire weight.
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