Welding can body, welding can, manufacturing method of welding can body, and manufacturing method of welding can

摘要

The welding can body of the present invention is formed of a tin-free steel plate or a material steel plate made of a resin-coated steel plate coated with a resin coating on a tin-free steel plate, the corresponding portions are overlapped with each other, and the overlapped portions are resistance welded. The welded portion (12) scheduled for the welded portion in the material steel plate constitutes an electrode contact surface on the side in contact with the electrode (A) during the resistance welding. Before the resistance welding, laser irradiation is performed on at least one of the four surfaces including two surfaces and two surfaces constituting the bonding surface on the side where the material steel plates are bonded together by the resistance welding. Thereby, the laser processing part by which the laser irradiation part from which chromium plating is removed and the steel plate is exposed is divided and formed is formed.