New Guy .A MIG welder is a wire feed welder and can be used either with gas or without. Gas ( Argon) is a shield or envelope around the weld point. The gas is from a pressure tank attached to the welding tubewire feeder.
and reduces oxygen to give you a cleaner weld. No gas means you must change the wire to a flux type. That will produce not as good a clean weld.
37 lookin.
