Spot welding uses a pair of electrodes with pointed tips to heat and join pieces of metal. It is ideal for applications using carbon steel and in automation. Projection welding is very similar to spot welding, using heat generated by an electrical current to join metals. However, the electrodes used in projection welding carry more current than those used in spot welding, allowing thicker materials to be welded together. During the weld, the projections themselves absorb the heat and form the weld. It is ideal for joining metal components with embossments.