Electric resistance welding
Electric resistance welding ERW refers to a group of welding process such as spot and seam welding that produce coalescence of fay surfaces where heat to form the weld is generated by the electrical resistance of material combined with 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 work-pieces, the metal coating or the lack of coating, the electrode materials, electrode geometry, electrode pressing force, electrical current and length of welding time. Small pools of molten metal are formed at the point of most electrical resistance (the connecting or "faying" surfaces) as an electrical current (100–100,000 A) is passed through the metal.
Electric resistance welding advantage:
(01) Metallurgical process is easy, Short heating time, concentrated heat,
(02)It does not require filler metals such as wire and electrode, as well as welding materials such as oxygen, acetylene and hydrogen, and low welding cost.
(03)Simple operation, easy to achieve mechanization and automation, improved production efficiency.
In general, resistance welding methods are efficient and cause little pollution, but their applications are limited to relatively thin materials and the equipment cost can be high. It is mainly used for the regular welding line such as the round, square, rectangle, and so on.
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