Resistance spot welding (RSW) or point welding is a process in which contacting metal surface points are joined by the heat obtained from #resistance to #electric current
It used to weld metal sheets (0.5-3mm) thickness by holding the two pieces together and applying a force then electric current flows through copper electrodes that concentrates current into small spot at the welded pieces
The pieces have a higher resistance than electrodes so the current produces heat when passes through it
This heat melts metal pieces in the welding spot and the pressure joins it together
The high amperage current is produced by electric #transformer
