| 摘要 |
PROBLEM TO BE SOLVED: To secure structure strength of a joint structure 1 and to significantly reduce manufacturing time of the joint structure 1.SOLUTION: A pair of weld torches 21 are moved relative to a panel plate 3 and a lounge 5 in a weld direction D, and arc is generated respectively, between a tip end of one weld wire 19 and one boundary 7, and between a tip end of the other weld wire 19 and the other boundary 7, and at the same time, a heating coil 31 heats locally a portion offset from a generation portion of an arc A to a rear side of the weld direction D in a rear face 3b of the panel plate 3. |
