Resistance spot welding is one of the oldest of the electric welding processes in use by industries today. The weld is
made by a combination of heat, pressure, and time. As the name resistance welding implies, it is the resistance of the material to
be welded to current flow that causes a localized heating in the part. Resistance spot welding is mostly used to weld various sheet
metal products. Typically the sheets are in the 0.5-3.0 mm thickness range. The resistance spot welding of dissimilar materials is
generally more challenging than that of similar materials due to differences in the physical, chemical and mechanical properties
of the base metals.
