Flux cored wires for gas shielded arc welding

摘要

A flux cored wire for gas shielded arc welding with a mixed gas comprising argon and carbon dioxide which comprises: a seam-welded steel sheath; and a core filled in the steel sheath and comprising, all in weight percent: a slag and arc stabilizer comprising 4.0 to 6.0% TiO2, 0.2 to 0.8% SiO2, 0.4 to 0.8% ZrO2, 0.2 to 0.8% Al2O3, 0.06 to 0.25% Na2O+K2O, and 0.1 to 0.4% metal fluoride; an alloying agent and metal deoxidizer comprising 0.03 to 0.06% C, 0.20 to 0.80% Si, 1.50 to 2.20% Mn, and 0.30 to 0.60% Mg; and not less than 2% Fe; in which the difference between the percentages of iron or a combination of Na and K segregated in any two quartered cross section of the wire that are defined by equations (1) and (2) in the specification are not more than 10% and not more than 0.15%, respectively.