| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a spot welding method by which a deformed bar on a main reinforcement side and a deformed bar on a stirrup side are welded together with excellent welding force without impairing the extensibility of the deformed bar on the main reinforcement side. <P>SOLUTION: In the spot welding method, the deformed bar 1 on the main reinforcement side and the deformed bar 2 on the stirrup side which are used for steel bars for concrete reinforcement are welded to each other in such a manner that the deformed bar 2 is superimposed on the deformed bar 1 in a crossed fashion so as to be brought into contact with one longitudinal rib 11 of the deformed bar 1 and deformed bars 1 and 2 are welded to each other at the cross-superimposed position. A grooved spot welding electrode having a groove 32 of the predetermined width in a fore end face 31 is used for the spot welding electrode 3 for the spot welding which is pressed against the side of the other longitudinal rib 12 of the deformed bar 1 on the main reinforcement side so that the fore end face 31 is not touched on the longitudinal rib 12. Edge parts 33a, 34a on both sides of the groove 32 at the fore end face 31 are pressed against portions of joints 13, 14 extending from both sides of the longitudinal rib 12 of the deformed bar 1, and the spot welding is performed in this condition. <P>COPYRIGHT: (C)2012,JPO&INPIT |
