Arc Welding and SWAM welding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals when cool result in a binding of the other metals. It is a type of welding that uses a welding power supply to create an electric arc between a metal stick and the base material to melt the metals at the point of other contact. Arc welders can use either (direct current) or (Alternating current). The welding area is usually protected by some type of shielding gas, vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated. First developed in the late part of the 19th century, arc welding became commercially important in shipbuilding during the World War second. Today it remains an important process for the fabrication of steel structures and vehicles and many in many more other industries