| 摘要 |
PURPOSE:To execute satisfactory three o'clock welding without weld defects by forming the groove face of a lower vertical plate to an inclined descending groove shape and building up beads to multiple layers by an eccentric wire of a rotating electrode nozzle. CONSTITUTION:The groove 8 formed of the upper and lower vertical plates 9, 10 is made into the descending groove shape formed by inclining only the groove face 10a of the lower vertical plate 10. The weld beads 13 are laminated in such groove 8 while the offcentered welding wire of a rotating electrode nozzle 11 is rotated. The wettability of the groove face 10a with a molten pool is improved and the lower bulging of the beads 13 is prevented by forming the descending groove face in the above-mentioned manner. Since the wire 14 is rotated, the sagging of the beads 13 is prevented and the beads are formed to the shape flattened by sticking uniformly to the inside of the groove. The satisfactory three o'clock welding without weld defect is thus executed.
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