Welding processes may be classified based on the source of energy they use. The diagram shows main welding processes used in industry.
Welding processes, which use electric arc a source of energy, are most widely used nowadays. These include:
Arc welding with a consumable electrode in shielding gas. International abbreviation for this welding process is either MIG (Metal-Inert-Gas) or MAG (Metal-Active-Gas) depending on the type of shielding gas.
Arc welding with a non-consumable electrode in shielding gas. International abbreviation for this welding process is TIG. The first letter in the abbreviation stands for the material of the electrode, i.e. tungsten (Tungsten-Inert-Gas).