MIG / MAG welding (Metal Inert Gas / Metal Active Gas) - welding with a consumable electrode in an inert gas shield (MIG, method 131) or active (MAG, method 135). This method uses inert gases, most often argon or helium. However, as active shielding gases - carbon dioxide or its mixture with argon. They take an active part in the welding process - they stabilize the arc and support the feeding of additional material to the weld. In the MIG / MAG method, the electric arc glows between the workpiece and the electrode in the form of a wire. The arc and pool of molten metal are protected by a stream of inert or active gas. The method is suitable for welding most materials, selecting electrode wires and shielding gas suitable for different metals. In addition, MIG / MAG welding provides a very high process efficiency and therefore is widely used in industry, in particular in the case of serial production.