ELECTRODE STRUCTURE FOR RESISTANCE WELDING

摘要

An electrode structure is provided in which an upper pin (2a) having a magnet (40) fixed thereto is built in a cavity (2c) inside an upper electrode (2) so as to be vertically movable to allow its front end portion to protrude downward from the upper electrode (2), and a lower pin (3a) is arranged so as to face the upper pin (2a) and built in a cavity (3c) inside a lower electrode (3) so as to be vertically movable to allow its front end portion to protrude upward from the lower electrode (3). In a state where the front end portion of the upper pin (2a) protrudes downward, the weld nut (N) inserted onto the front end portion is attracted and held by the magnet (40). In a state where the upper pin (2a) is pushed upward by the lower pin (3a) so that the magnet (40) is separated from the weld nut (N) by a predetermined distance, the weld nut (N) comes off the upper pin (2a) and drops due to a less attracting force by the magnet (40), and then fitted onto the lower pin (3a) at a position higher than a workpiece.