Welding, Projection

Resistance welding in which one or more areas of contact, in the form of projections, are made in the components before welding and in which a number of welds may thus be made simultaneously by means of projection welding dies. Current and pressure are auto­matically concentrated at the welding points and the electrodes are designed to only transfer the current and pressure as opposed to spot welding, where the necessary con­centration is obtained by special shaping of the electrodes; cross wire welding is therefore an example of projection welding.