Patent ID: 7514647
Filing Date: 2009-04-07
Classification: B23K

Abstract:
1. An apparatus adapted for spot welding adjacent members during a welding cycle, wherein the apparatus and members cooperatively generate a quantity of heat energy within a heated zone, so that the temperature of the zone rises from an initial base temperature to a final base temperature, and for reducing the final base temperature, said apparatus comprising: a spot-welding electrode presenting a distal engaging portion formed of a non-refractory metal, and located within the heated zone, said distal engaging portion presenting a distal surface configured to contact and bear against one of the members, and defining a longitudinal portion depth and a maximum portion width; and a phase changing body located within the portion and spaced from the surface a distance not less than 4 millimeters, said body having a phase changing point greater than the initial base temperature and not greater than the final base temperature of the zone; during the welding cycle, a longitudinal depth not less than a quarter of the portion depth, and a width not less than half of the portion width.