Sheet separation which is one of the factors that affects
the spot weld quality occurs at faying surfaces due to the
expansion and contraction of the weld metal and the forging
effect of the electrodes on the hot nugget [1]. During
this study, normal separations were obtained. This can be
attributed to the developed molding in which base metals
were hold properly during the weld processes. The fracture
characteristics of tensile shear specimens were evaluated.
The macrograph of the coalescence types of welded materials
are shown in Fig. 6(a)–(c).