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MIG stands for "metal inert gas"... you use a wire (metal) as a filler after the material is burnt away... and CO2, argon, or 75/25 argon/CO2 mixture (inert gas) to keep the weld contained and clean.... if you are only using wire, it is simply a wire feed welder, not mig.... so... if you CAN hook gas up to the welder, it is a MIG welder, any mig welder can be used as a fluxcore wire feed welder... but it is suggested that the polarity of the clamp/gun are reversed.. in mig welding, you want the gun to be positive, and the clamp to be negative... in fluxcore welding, you want a negative gun, and a positive clamp