TIG welding process of high tension steel and solid wire null for TIG welding

摘要

PROBLEM TO BE SOLVED: To provide a TIG welding method of high-tensile steel and a solid wire for TIG welding capable of improving the welding efficiency and the welding environment, excellent in the mechanical property, and capable of preventing development of the weld cracking. ;SOLUTION: In a TIG welding method of high tensile steel which contains, by weight, ≤0.13% C and whose tensile strength is 760 to 980N/mm², a solid wire is used in which the martensitic transformation start temperature of the fully-deposited metal obtained by the method specified in JIS-Z-3111 is ≤400°C, 7.5 to 12.0% Ni is contained to the total weight of the wire, and the composition of ≤0.10% C and ≤2wt.ppm H is regulated, and the wire feeding speed is 5-40g/min. for welding.;COPYRIGHT: (C)1997,JPO