In this video, we explain the correct gas to use when either MIG or TIG welding.
TIG Welding requires pure Argon gas, which produces a clean weld with no oxidisation.
MIG Welding requires an Argon-CO2 mixture for higher penetration and heat.
The purpose of the gas in the MIG process is to protect/shield the wire, the arc and the molten weld metal from the atmosphere. Argon-C02 mix gas offers better weldability for thin metals and has a wider range of setting tolerance on the machine. Argon 80% / Co2 20% is a good all-round mix suitable for most applications.