| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas shield arc welding method for providing weld metal having excellent breaking elongation, by restraining the occurrence of a ductility reduction crack, when welding superhigh tensile steel having tensile strength of 950 MPa or more.SOLUTION: In the pulse gas shield arc welding method, metal fluoride including CaFof 2.0-8.0% and metallic oxide of 0.01-1.2% are included in a flux-cored wire, and are included so that a value of the ratio of the content of the metal fluoride and the metallic oxide becomes 2.0 or more, and inclusion of Fe powder is also limited to be less than 5.0%, and C:0.08-0.20%, Mn:1.0-2.2%, Ni:1.0-9.0% and V:0.05-0.3% are included as an alloy component, and a wire being 0.60-1.40% in Ceq is used, and a pulse current is used as a welding current. |
