Shop Weldfabulous for Miller, ESAB, and other MIG welders. Also known as wire feed welders or Metal Inert Gas, MIG welders use a spool of wire with a continuous wire electrode, along with shielding gas to create the weld. The welding process protects the weld from contamination. Argon, carbon dioxide or argon mixed gases are the most commonly used in MIG welding. Most commonly used for automotive work and general metal fabrication, MIG welding is very economical and easy to use. MIG welders can also be used for Flux-Cored Arc Welding which utilize an internal flux to shield the weld from unwanted contamination..