When spot welding, the parts pressed up against each other after the jointing component has been sufficiently heated are connected by means of spot welding electrodes via current flow. The joint is made by melting and hardening the material at the joint.
When projection welding, the heating and current flow required for welding is generated by the projection form. In resistance projection welding the electrodes only serve to provide current and power.
In seam welding, the roll formed electrodes press the sheets together and transfer the welding current. The welding spots are set so densely by the rolls that a coherent thick seam is formed.
Butt seam welding of sheets is carried out using a thin piece of sheet ("foil"). This procedure enables you to join standard sized sheets together instead of using cost-intensive, large format steel sheets.
Mesh welding is a variation of projection welding in which the large surfaced and planar electrodes are resistance welded using multiple cross wire connections in one stroke. The depth to which the wires are able to penetrate is determined by the welding time.
The nuts and screws to be welded are given round, lengthwise or ring projections. These projection forms determine the current density and the current flow passes through the welding electrodes. This enables welded nuts/screws to be joined on a sheet using resistance welding.
The resistance soldering procedure is used to solder parts with differing masses that have a high level of heat conductivity. The electrical resistance is formed at the soldering position which heats directly. The soldering paste ensures that the electrical resistance is greatest at the soldering position.
When hot riveting, the rivet is heated by means of resistance warming and then compressed. This creates the rivet head at the rivet join via electrical current and the heat it generates. The two parts connected using a resistance heated rivet can be moved against each other.
