Abstract: 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.

Abstract: A flux-cored wire includes by mass %: C in a skin of 0.04 to 0.08% w.r.t. a total mass of the skin, w.r.t. a total mass of the wire by a sum of the skin and flux: C: 0.05 to 0.12%, Si: 0.1 to 0.6%, Mn: 1.5 to 3.5%, B: 0.002 to 0.015%, a sum of Al2O3 conversion value of Al and Al2O3 conversion value of an Al oxide: 0.3 to 1.5%, and w.r.t. the total mass of the wire in the flux: Mg: 0.2 to 0.8%, and sums of TiO2 conversion value of a Ti oxide: 5 to 10%, SiO2 conversion value of a Si oxide: 0.2 to 0.7%, ZrO2 conversion value of a Zr oxide: 0.1 to 0.6%, F conversion value of a fluorine compound: 0.02 to 0.15%, and Na2O conversion value and a K2O conversion value of a Na compound and a K compound: 0.03 to 0.20%.

Abstract: A flux-cored wire for carbon dioxide gas shielded arc welding including, in terms of % by mass with respect to a total mass of the wire, 0.03 to 0.08% of C, 0.2 to 0.7% of Si, 1.4 to 3.0% of Mn, 0.01 to 0.5% of Cu, 0.8 to 3.0% of Ni, 0.05 to 0.5% of Ti, 0.002 to 0.015% of B, 0.05% or less of Al, 4 to 8% 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 0.2% or less in terms of ZrO2.

Abstract: A wire including, 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 0.08% of C, 0.1 to 0.6% of Si, 1.2 to 2.5% of Mn, 0.01 to 0.5% of Cu, 0.5 to 1.5% of Ni, 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, 4 to 8% 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 0.2% or less in terms of ZrO2.

Abstract: A flux-cored wire for gas-shielded arc welding, including, in terms of mass % relative to a total mass of the wire, in the total of the steel outer sheath and the flux, C: 0.03 to 0.08%, Si: 0.1 to 0.6%, Mn: 1.5 to 2.8%, Cu: 0.01 to 0.5%, Ni: 0.35 to 0.98%, Ti: 0.05 to 0.25%, and B: 0.002 to 0.015%, Al: 0.05% or less, and including, in the flux, TiO2 conversion value: 3 to 8%, Al2O3 conversion value: 0.1 to 0.6%, SiO2 conversion value: 0.2 to 1.0%, ZrO2 conversion value: 0.20 to 0.65%, Mg: 0.2 to 0.8%, F conversion value: 0.05 to 0.25%, Na conversion value: 0.02 to 0.10%, and K conversion value: 0.05 to 0.20%.

Abstract: A flux-cored wire for gas shielded arc welding includes C: 0.03 to 0.09%, Si: 0.1 to 0.6%, Mn: 1.3 to 3.0%, Ti: 0.05 to 0.50%, B: 0.002 to 0.015%, and Al2O3 converted value: 0.4 to 1.0%, as the total content in the steel sheath and the flux in mass % relative to the total mass of the wire; and TiO2 converted value: 5.0 to 9.0%, SiO2 converted value: 0.2 to 0.7%, ZrO2 converted value: 0.1 to 0.6%, Mg: 0.2 to 0.8%, total of F converted value: 0.02 to 0.20%, and total of Na2O converted value and K2O converted value: 0.03 to 0.20%; as a content in the flux; in which a content of C in the steel sheath is 0.03% or less in mass % relative to the total mass of the steel sheath.

Abstract: 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.

Abstract: A flux-cored wire for carbon dioxide gas shielded arc welding includes, in terms of % by mass with respect to a total mass of the wire, 0.03 to 0.08% of C, 0.2 to 0.6% of Si, 1.2 to 2.8% of Mn, 0.01 to 0.5% of Cu, 0.2 to 0.7% of Ni, 0.1 to 0.6% of Ti, 0.005 to 0.020% of B, 0.05% or less of Al, 4.0 to 8.0% 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 0.2% or less in terms of ZrO2.

Abstract: A flux-cored wire for gas shielded welding use which can reduce the oxygen of weld metal to obtain a weld joint which is excellent in toughness and which enables all-position welding by direct current reverse polarity, wherein the wire contains, by mass % with respect to the wire total mass, CaO: 0.2 to 7.0%, one or more of MgF2, CaF2, SrF2, and BaF2 in a total of 1.0% or more (total of fluorides and CaO being 3.0 to 12.0%), one or more of Si, Al (less than 0.3%), Ti, Mg, Zr, Ca, Ce, and La in a total of 0.2 to 2.0%, and one or more oxides of Si, Mn, Al, Ti, B, and Zr in a total of 0.2 to 3.0%, ?=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+Nb/10+5B is 0.15 to 0.40%, P and S in a total of 0.040% or less, a balance of Fe, an arc stabilizer, unavoidable impurities, and a content of iron powder in the flux of 5.0% or less.

Abstract: A flux-cored wire for gas shielded welding use which can reduce the oxygen of weld metal to obtain a weld joint which is excellent in toughness and which enables all-position welding by direct current reverse polarity, wherein the wire contains, by mass % with respect to the wire total mass, CaO: 0.2 to 7.0%, one or more of MgF2, CaF2, SrF2, and BaF2 in a total of 1.0% or more (total of fluorides and CaO being 3.0 to 12.0%), one or more of Si, Al (less than 0.3%), Ti, Mg, Zr, Ca, Ce, and La in a total of 0.2 to 2.0%, and one or more oxides of Si, Mn, Al, Ti, B, and Zr in a total of 0.2 to 3.0%, ?=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+Nb/10+5B is 0.15 to 0.40%, P and S in a total of 0.040% or less, a balance of Fe, an arc stabilizer, unavoidable impurities, and a content of iron powder in the flux of 5.0% or less.