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Resistance spot welding
Resistance spot welding (RSW) is one of the oldest forms of welding used today. It is a resistance welding process in which two pieces of metal are joined when a current is passed between electrodes located on opposite sides of the pieces. Fusion is caused not by an arc, but rather by the resistance of the metals to the current passing through them.
The weld resulting from resistance spot welding is unique in that the weld nugget is formed internally, or between the surfaces of the base metals. MIG and TIG welds start at the surface of one of the metals and move through both pieces. Resistance spot welds, on the other hand, start internally as a result of electrodes on either side of the base metals.1