| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of butt welding for the piping, and to facilitate a welding operation. SOLUTION: In an automatic welding guide ring 19 for the piping, mounted on a groove butting part 18, a centering adjustment mechanism 26 for pushing out the piping 10, 12 and centering the piping each other is revolvably arranged. After centering the piping each other by the centering adjustment mechanism 26, by moving a welding head 42 rotatable along the inside wall of the automatic welding guide ring 19 for the piping, the groove butting part 18 is welded. Hereupon, first slider and second slider are provided between traveling ring 40 and welding torch, and since a copy roller copying the groove butting part is provided on the welding torch side, even when the revolving locus of the welding head 42 is not parallel to the groove butting part 18, the welding torch is revolvably moved on the groove butting part. Therefore, the welding is enabled with a high quality and the welding operation is facilitated. |
