| 摘要 |
PCT No. PCT/JP97/02815 Sec. 371 Date May 29, 1998 Sec. 102(e) Date May 29, 1998 PCT Filed Aug. 11, 1997 PCT Pub. No. WO98/06530 PCT Pub. Date Feb. 19, 1998When a projection nut is brought into an intended position, in order that welding may be completed with the nut kept at accurate posture and the nut fed in correct position, a recess (21) is formed at the leading end of a feed rod (20), the feed rod (20) is moved back in a direction almost orthogonal to the axial line of an electrode, and when the feed rod (20) is stopped, a guide pin (13) of an electrode (11) gets into a screw hole (26) of a projection nut (25), and then the feed rod (20) is restored to determine the position of the nut (25), then the other electrode (19) advances to complete the welding.
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