| 摘要 |
PURPOSE:To prevent the burn through at welding start and completion end parts and improve the quality of the weld zone by transferring the arc for working to the arc induction fitting arranged at the butt welding end of the body to be welded or the vicinity. CONSTITUTION:The arc induction fitting 2, 3 consisting of such a metal as a brass or copper and having the arc induction parts 2b, 3b located higher than the butt parts 2a, 3a of the body 1, 1' to be welded are arranged at the start end X and terminal end Y of the butt part Z of the body 1, 1' to be welded. In case of a arc torch 5 being set to the start end X of the butt part Z, the arc 4 can be formed between the arc torch 5 and arc induction fitting 2b, so the excess heat input into the butt part start point X can be prevented. It is similar at the finishing point as well. In this way, the quality of the weld zone can be improved.
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