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 wire includes, in mass % with respect to the total mass of the wire, in the total of a flux and a steel sheath, 0.04 to 0.12% of C, 0.3 to 0.8% of Si, 1.5 to 3.0% of Mn, 0.2 to 1% of Ni, 0.8 to 1.4% of Al in terms of Al2O3 and Al2O3 in total and 0.3 to 0.6% of Al, and 0.004 to 0.012% of B, and further includes, in the flux, 5.0 to 7.0% of Ti oxide in terms of TiO2, 0.2 to 0.6% of Si oxide in terms of SiO2, 0.4 to 0.7% of Zr oxide in terms of Zro2, 0.1 to 0.5% of Mg, 0.02 to 0.1% of Na compound in terms of Na2O, and 0.04 to 0.1% of K compound in terms of K2O.

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: The present invention provides a flux cored wire for gas shielded arc welding of high-strength steel having proof stress of 690 MPa or more, which is capable of all-position welding with a higher efficiency and exhibits an excellent cracking resistance. The flux cored wire comprising a steel sheath, and a flux filled therein, wherein the flux cored wire comprises, by mass % with respect to the total mass of the flux cored wire: C: 0.03 to 0.10%, Si: 0.25 to 0.7%, Mn: 1.0 to 3.0%, Ni: 1.0 to 3.5%, B: 0.001 to 0.015%, Cr: limited to 0.05% or less, and Al: limited to 0.05% or less, and in the flux, TiO2: 2.5 to 7.5%, SiO2: 0.1 to 0.5%, ZrO2: 0.2 to 0.9%, and Al2O3: 0.1 to 0.4%; and the remainder comprising: Fe, arc stabilizer, and unavoidable impurities; and wherein the total mount of hydrogen in the flux cored wire is in 15 ppm or less.

Abstract: A metal-based flux cored wire for Ar—CO2 mixed gas shielded arc welding used for short arc welding and spray arc welding. The wire results in extremely small amounts of slag formation and spatter generation, giving a good bead shape, and giving excellent low-temperature toughness of the weld metal. The flux cored wire includes a steel sheath in which a flux is filled, and the flux contains a metal powder in 97 mass % or more, and the wire contains, by mass % with respect to the total weight of the wire, C: 0.03 to 0.12%, Si: 0.5 to 1.2%, Mn: to 3.5%, S: 0.005 to 0.05%, iron powder with amount of oxygen of 0.25% or less: 4.0 to 15.5%, a total of one or more of alkali metal oxides, alkali metal fluorides, and metal oxides: 0.35% or less, and the balance of mainly Fe ingredient of the steel sheath and Fe ingredients from the flux etc. and unavoidable impurities.