MAG: based on welding with a fusible electrode in the shield of active gases. Often, a mixture of carbon dioxide and argon or carbon dioxide is used.
MIG: based on welding with a fusible electrode in an neutral gas shield (most often used: argon, helium).
In these methods, you can observe the glow of an electric arc between the electrode in the form of a wire and the material being welded. The liquid metal lake and arch are protected by active or inert gas.
The MIG / MAG method is used in the welding of many materials due to the appropriate selection for different metals of shielding gas and electrode wire.