Any joining process that relies on passing an electrical current through a workpiece. The heat is generated by the metal’s resistance to the electrical current.
In the tube and pipe industry, high-frequency, noncontact electrical resistance welding is so common that the abbreviations HF and ERW are used interchangeably. However, high-frequency isn’t the only useful ERW process. Many frequencies are used, including direct current, which has no frequency at all, as is contact welding.
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