Electric resistance welding (ERW) refers to a group of welding processes such as spot and seam welding that produce [of faying surface]s where heat to form the weld is generated by the electrical resistance of material vs the time and the force used to hold the materials together during welding. Some factors influencing heat or welding temperatures are the proportions of the workpieces, the coating or the lack of coating, the electrode materials, electrode geometry, electrode pressing force, weld current and weld time.
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