Electric resistance welding (ERW) refers to a gaggle of fastening processes that's employed in the production of ERW steel pipe by Prime Steel Pipe (a glorious steel pipe manufacturer) , as well as spot and seam fastening. The operational principle of ERW is that manufacturing conjugation of faying surfaces wherever heat to create the weld is generated by the electric resistance of fabric combined with the time and also the force accustomed hold the materials along throughout fastening. Heat to create the weld comes from electric resistance of fabric, instead of time and force. Some factors influencing heat or fastening temperatures square measure the proportions of the workpieces, the metal coating or the dearth of coating, the conductor materials, conductor pure mathematics, conductor pressing force, electrical current and length of fastening time. Tiny pools square measure fashioned at the purpose of most resistance, the connecting surfaces. As a high current passes through metal, electric resistance results. tiny pools of liquefied metal square measure fashioned at the purpose of most electric resistance (the connecting or "faying" surfaces) as associate degree electrical current (100–100,000 A) is responded to the metal. In general, resistance fastening ways square measure economical and cause very little pollution, however their applications square measure restricted to comparatively skinny materials and also the instrumentality value is high (although in production things the price per weld could also be low).
