MIG welding systems use consumable electrodes. This method of welding is easier than the TIG welding method. TIG welding employs non-consumable electrodes. Welding with this method produces quality welds. More precise welding can take place through TIG welding. Both types of welding require a shielding gas.
The electric arc that forms between a welding gun and a work piece is drawn through an electrode. Consumable electrodes are melted and deposited onto a work piece during welding. Non-consumable electrodes do not melt; they act merely as a channel that directs the flow of electricity to a work piece.
Miller welder systems have to be hooked into a shielding gas source to produce proper welds. Shielding gases prevent weld-site contamination and stabilize the electric arc. Argon is the gas of choice when it comes to shielding gas for MIG and TIG welding. This gas is safe to use, relatively cheap and easily combined with other gases like helium and carbon dioxide to make a shielding gas.