Projection RWM Equipment

By projection welding a contact point between work pieces to be welded is determined not by electrodes but by projections (reliefs) on the parts. Die-forged spherical-type projections of round form are mostly used in straight lap joints. The projection form and size determine a welding process and a weld joint, therefore acting as essential parameters of the projection welding mode. Unlike resistance spot welding, the electrode contact area is not determinative and this parameter is not included in the projection welding mode. Projection welding has a number of types, main of them, apart from lap joints, including tee joints; cruciform joints of wires, rods and pipes, or double tee welding. The following machines are used for making joints by projection welding: single-phase RWM, low-frequency RWM.