What types of material can be welded with MIG machines?

What types of material can be welded with MIG machines?

Virtually all types of material can be welded with a MIG machine. However, in the MIG process different materials require different wire and gases. For instance mild steel can be welded with either self-shielded wire, (which does not require separate shielding gas) or with CO2 or a CO2 mixed gas. Aluminum material requires the use of Argon gas.