Bolt welding is a method for welding bolts onto plates. Bolt welding requires a bolt welding machine. The bolt is welded to the plate by melting a specially manufactured point first onto the bolt and then onto the plate through a brief, but powerful electrical impulse. Bolt welding does not involve pre-punching of holes or other shapings into the item.The projection welding of a weld bolt involves three phases. In the first phase, the projection is in contact with the mating sheet. Then the current starts to heat the projection to welding temperature. The electrode force then causes the heated projection to collapse rapidly, and fusion takes place.
