| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux-cored wire for carbon dioxide gas shielded arc welding, for providing excellent welding workability in the whole attitude, and for providing welded metal excellent in cold crack resistance and low-temperature toughness.SOLUTION: A flux-cored wire for the carbon dioxide gas shielded arc welding includes C: 0.03-0.08%, Si: 0.2-0.6%, Mn: 1-2.5%, Cu: 0.01-0.5%, Ni: 1-3.5%, Ti: 0.01-0.3%, B: 0.002-0.015%, a TiOconversion value: 3-8%, an AlOconversion value: 0.1-1.2%, an SiOconversion value: 0.1-1%, a ZrOconversion value: 0.01-0.8%, Mg: 0.1-0.8%, the total of an NaO conversion value and a KO conversion value: 0.05-0.2% and the total of an F conversion value: 0.01-0.3%, in mass%, with respect to the whole wire mass, and the whole hydrogen quantity of the wire is 20 ppm or less in mass ratio with respect to the whole wire mass. |
