Resistance welding is a group of welding processes in which coalescence is produced by the heat obtained from resistance of the work piece to electric current in a circuit of which the work piece is a part and by the application of pressure. There are at least seven important resistance-welding processes. These are flash welding, high-frequency resistance welding, percussion welding, projection welding, resistance seam welding, resistance spot welding, and upset welding. They are alike in many respects but are sufficiently different.
Resistance Welding classified as follows :
- Resistance spot welding (RSW)
- Projection welding (RPW)
- Resistance seam welding (RSEW)
- Flash Welding (FW)
- Upset welding (UW)
- Percussion welding (PEW)
- High frequency resistance welding (HFRW)
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