Method for joining metal plates by welding/adhesion, comprises establishment of a protruding boss on the inner surface of one plate and using it to initiate weld and produce heat to melt adhesive

摘要

At a point (4a) near the edge of a joint which is to be made between two plates (1,2) one of the plates is indented to form a boss on the inner surface. Welding electrodes (E1,E2) are able to establish an initial weld easily and are then moved to a second welding position. During the move the welding current travelling through the initial weld heats and melts the adhesive (3) which allows normal electrode pressure to make the second weld