ELECTRIC RESISTANCE WELDING:
In electric resistance welding (ERW) methods, a high current is passed through the metal pieces to be joined together and the heat is produced due to the resistance in the electric circuit. This heat energy is utilized to increase the temperature of a localised spot of the work pieces to produce coalescence, and then applying pressure at this spot till welding takes place. Electric resistance welding process is a pressure welding process and not a fusion welding process. The output of heat, in this process can be easily calculated. Heat generated is proportional to I2R·t, where I is value of current, R is resistance and t is the time during which current flows.
The following ERW processes are in vogue:
3. Butt welding process, and
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