Projection welding is characterized by joining the predetermined weld point or so called projections embossments on the weld part with the parent material. Projection welding current and weld force are localized on the weld points unlike spot welding where the weld is determined by the size or shape of electrode. Projections for projection welding can be produced by embossing on sheet metal, Projection welding has wider applications than spot welding; from welding nuts and bolts to sheet components to as big as welding