STEEL WIRE FOR GAS SHIELD ARC WELDING

PROBLEM TO BE SOLVED: To provide a steel wire for gas shield arc welding of a 490 N/mm class high tension steel having an excellent wire feeding property and welding workability and capable of ensuring toughness in a welding metal or the like even when welding is conducted in a high inlet heat or high pass interval temperature. SOLUTION: This wire contains Ti: 0.10-0.35%, B: 0.003-0.010% by mass %. In the wire, the quantity of oxygen in a wire surface layer part to the depth of 5% to a wire diameter of the steel wire for gas shield arc welding in which N is less than 0.0050 by mass % is 0.020-0.060 by mass %. Furthermore this wire has a crack on its wire surface. The crack on the wire surface is continuously annealed under a non-oxidative atmosphere at more than 650 deg.C for 1-15 min., and imparted by a drawn line after pickling.