| 摘要 |
PROBLEM TO BE SOLVED: To fully melt the lower wall side of a narrow groove in horizontal position welding for a narrow groove. SOLUTION: Supported with a torch block 8 is an electrode structure 5, for which the upper and lower face of a narrow planar insulating plate 1 arranged horizontally is held between the upper and lower electrodes 3a, 3b each connected to a separate power source, and for which a welding wire is inserted at a position away from the electrodes of the insulating plate 1. The tip end of the lower electrode 3b of the electrode structure 5 is cut obliquely downward. An arc is generated obliquely downward from the tip end of the lower electrode 3b, the molten metal 10 flowing down from the upper part is spread out, and an overlapped part is prevented from generating.
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