 Since metal ductility increases with temperature, heat assisted clinching processes have been developed, thus increasing the material ductility and extending the clinching "join ability".In addition, increasing the joining temperature results in a reduction in the material's yield stress and consequently a reduction of the required joining force.Nevertheless, if prolonged heating is applied, an increase in the grain size as well as metallurgical changes of alloys may affect the mechanical behavior of the material at the joint vicinity.