| 摘要 |
PROBLEM TO BE SOLVED: To perform one round automatic welding for such a weld zone that the interval of a tube butt weld zone of a boiler panel is narrow. SOLUTION: In the welding head having a welding torch 11, a torch rotating ring 1, a torch raising and lowering ring 2, a wire feeding mechanism 20, a welding head body 3 and a clamp mechanism 19, a tube 21 to be welded is clamped by the welding head using the clamp mechanism, the torch rotating ring and the torch raising and lowering ring are concentrically arranged, the rotation axes of both rings are made to coincide with the central axis of the tube to be welded, and the welding torch is rotated by the torch rotating ring via a torch pedestal 14 and also is moved in the contacting and uncontacting direction by the torch raising and lowering ring relative to the tube to be welded. A shaft 16 attached to the torch pedestal is fitted into a groove 15 provided in the torch raising and lowering ring, and the welding torch is moved in the contacting and uncontacting direction relative to the tube to be welded by the difference in the number of revolutions between the torch rotating ring and the torch raising and lowering ring.
|
