| 摘要 |
PROBLEM TO BE SOLVED: To adjust an electrode angle to a welding base material to a proper value in accordance with the position of the welding electrode. SOLUTION: A tilting shaft 44 is fixed so as to make it tiltable freely on a truck 16 that moves on rail 14 over the entire circumference of a fixed tube 10, and a torch 46 is also fixed on the tilting shaft 44, with an electrode 48 stored inside the torch 46. When the truck 16 moves around the fixed tube 10, the angleθy of the electrode 48 is adjusted according to the position of the truck 16 so that a virtual electrode center line D through the axial center of the electrode 48 always goes through a virtual eccentric point Q.
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