Projection welding apparatus, projection welding method and projection welding structure

摘要

A projection welding apparatus (50) for welding a first plate member (22) having plural welding projections (28) and a second plate member (24A), the apparatus comprising a first electrode (42); a second electrode (40), the first and second plate members are provided between the first and second electrodes, the second plate member includes a facing portion (32) and an extension portion (30) extending from the facing portion towards the first plate member and an end face of the extension portion abuts with the welding projections (28); a pressing unit (56) causing the second electrode (40) to approach the first electrode (42), and presses the end face of the extension portion against the welding projections via the second electrode; a voltage application unit (54) causing current to flow in the first and second plate members; and a stopper member (44), disposed between the first electrode and the facing portion (32), is contacted against the facing portion of the second plate member, and electrically connects the facing portion and the first electrode so as to bypass the first plate member.