Ar-CO 2 mixed gas of high tensile steel Shielded flux cored wire for arc welding

摘要

PROBLEM TO BE SOLVED: To provide a weld metal having a proper strength and an excellent tenacity in a low temperature region in a weld of a high tension steel of 590 MPA and a flux-cored wire for Ar-COmixed gas shield arc welding flux-cored wire of high-tension steel excellent in welding workability.SOLUTION: A flux-cored wire for Ar-COmixed gas shield arc welding flux-cored wire of high-tension steel excellent in welding workability is characterized by containing C: 0.03 to 0.12%, Si: 0.2 to 1.5%, Mn: 1.5 to 3.5%, Cu: 0.05 to 0.45%, Mo: 0.3 to 1.0%, Al: 0.1% or less; SiO: 0.01 to 0.2%, 0.02 to 0.15% of NaO conversion value and KO conversion value, and the remainder being Fe of steel covering, iron powder, Fe component of iron alloy powder, and an inevitable impurity, as a mass % with respect to the total mass amount of wire, in a total of flux and steel covering.SELECTED DRAWING: None