Series spot welding method, device for carrying out the method, and electrodes employed in the method or the device

摘要

In a series spot welding method, leading edge portions of pressed electrode tips crush bearing surfaces that are one stage higher than a general portion. Thereby, the bearing surfaces are first deformed into a spherical shape. The bearing surfaces thus deformed into the spherical shape are then brought into spot contact with a second steel plate. Thus, the bearing surfaces thus deformed into the spherical shape form a conduction path narrowed down to a spot, between a first steel plate and the second steel plate. Therefore, the density of welding current flowing through the conduction path can be enhanced, and a nugget of sufficient size can be created between the first and second steel plates.