A wire includes, in terms of % by mass with respect to a total mass of the wire, as a total in a steel outer skin and a flux, 0.03 to 0.09% of C, 0.1 to 0.6% of Si, 1.3 to 2.6% of Mn, 0.01 to 0.5% of Cu, 0.05 to 0.5% of Ti, 0.002 to 0.015% of B, and 0.05% or less of Al, and further including, in the flux, 5 to 9% in terms of TiO2, 0.1 to 0.6% of in terms of SiO2, 0.02 to 0.3% in terms of Al2O3, 0.1 to 0.8% of Mg, 0.05 to 0.3% in terms of F, 0.05 to 0.3% in terms of Na and K in a fluorine compound, 0.05 to 0.2% of Na2O and K2O, and 0.1% or less in terms of ZrO2.