There are several methods of arc welding, including TIG and MIG welding. TIG welding, or tungsten inert gas welding, uses nonconsumable electrodes and is often used for welding thinner materials. MIG welding, or metal inert gas welding, typically calls for consumable electrodes. This method is ideal for a wide variety of applications.
Electrodes are either consumable or nonconsumable. Consumable electrodes melt as the electricity runs through them. This type of electrode drips down onto a work piece and when it cools, creating an effective weld. Nonconsumable electrodes merely act as an avenue for electricity to travel through down to a work piece.
Shielding gases are employed to increase the effectiveness of welds and to curb erratic electricity movement as it arcs from an electrode down to a work piece. Shielding gases stream down over the electrode, surrounding the live arc of electricity as it creates welds. Argon is the most widely used shielding gas for welding applications.