RESISTANCE WELDING METHOD FOR BODY TO BE WELDED WITH SMALL HEAT CAPACITY

PURPOSE:To restrain the temp. up speed of a weld zone and to improve the strength by performing a resistance welding by wetting the welding place of the material to be welded by the liquid for cooling. CONSTITUTION:The materials 1, 2 to be welded are placed on the electrode 3 for the lower part welding by their overlapping and the upper part welding electrode 4 equipping the feed path 5 of the liquid 6 for cooling is arranged at the upper part of the materials 1, 2 to be welded movably vertically as well. The liquid 6 for cooling is fed to the surface of the welding place of the material 1 to be welded as a liquid grain from the feed path 5 of the electrode 4 for the upper part welding prior to the welding in advance and the welding place thereof is made wet with the liquid 6. The materials 1, 2 are then subjected to a resistance welding by electrifying the space between both electrodes 3, 4 as well as abutting the tip of the electrode 4 to the welding place. In this case the weld zone is cooled by the heat of vaporization of the liquid 6 for cooling, so the constraint of the temp. up speed of the weld zone and the improvement of the welding strength are enabled.