Welding is a manufacturing process that is usually used to join two metal parts together. This process is done by melting the two workpieces and adding filler material. When this molten material cools down, it becomes a strong joint.

Different energy sources can be used, but the most common one is the electric arc.  An electric current is passed through an electrode and creates an arc when it is close to the base material. This arc is created because of the differences between the electrode and the base material.

This arc generates heat and melts the material. Arc welding is the most common type of welding used by manufacturers because it can be manual, semi-automatic or even, fully automated.