| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux-cored wire that enable excellent welding working properties and improved low temperature toughness to be obtained in the vertical one pass welding of a thick steel plate in two-electrode electrogas arc welding, and to provide a method and equipment for two-electrode electrogas arc welding. SOLUTION: Two-electrode electrogas arc welding is performed on a material 1 to be welded, by holding a sliding copper plate 2 against the front face of the extremely thick material 1 to be welded, applying a fixed type backing material 3 to the rear face, and arranging two welding wires 4, 5 apart from each other in the plate thickness direction in the groove that is wider in the front side than in the rear. In this case, only the welding wire 4 on the front side is oscillated and not the welding wire 5 on the rear. In addition, for the welding wires 4, 5, a flux-cored wire is used containing, each in mass % in the total mass of the wire, 1.5-2.5% Mn, 0.10-1.00% SiO<SB>2</SB>, 0.5-3.0% Ni, 0.10-0.50% Ti, and 0.004-0.020% B. COPYRIGHT: (C)2004,JPO
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