Arc welding is a type of welding in which two metals are melted to fuse with each other through an electric arc. An electric arc is a flow of current through a gap in the circuit which is facilitated by localized thermally ionized gas particles. This arc is initiated by bringing an electrode into contact with the work part, which completes the circuit, then separated at a small distance. The resulting temperature due to this arc is in the order of 4500 °C or higher, which can melt any metal.