| 摘要 |
PROBLEM TO BE SOLVED: To obtain a welding method by which a penetration ratio of 100% is secured without using a backing plate, and simultaneously, proper weld reinforcement can be performed. SOLUTION: In the welding method, a torch 11 for plasma welding and a torch 12 for MAG (METAL ACTIVE GAS) welding are arranged with prescribed spacing S on a butt welding line L, and, while they are substantially or relatively moved on the welding line L, at first, penetration is attained by plasma welding, and, after a prescribed time, weld reinforcement is performed by MAG welding. The sufficient penetration can be performed without using a backing plate, and further, the proper weld reinforcement can be performed since, at first, the penetration is attained by the plasma welding, and after a prescribed time, the weld reinforcement is performed by the MAG welding. Thus, the component cost of a backing plate or the like, the set cost therefor or the like are not required, and the man-hour for the excision of weld reinforcement is made needless. COPYRIGHT: (C)2005,JPO&NCIPI |
