Gas for MIG welding is one of major costs in fabrication.
In MIG welding for general purpose (mild steel) you can use CO2 as shielding gas. It takes a bit more experience to get nice welds, but is cheapest option. If you wand to use mixture, general purpose 80% Ar 20% CO2 shielding gas is industry standard, beside some special mixtures where you also have combination of more gases.
It depends on the type of metal being welded. Please see the attached table that gives some types of mixtures used in industrial applications.
Similar to the previous answer there are several open literature guides (see below). You may want to consider adaptive power supplies or dual wire feed units to minimize your overall cost.
http://www.lincolnelectric.com/assets/en_us/Products/Consumable_MIGGMAWWires-SuperArc-SuperArcL-50/c4200.pdf
Argon is the main shielding gas used for Tig Welding and for Mig Welding Aluminium or Mig Brazing. ... Co2 produces a cooler, coarser, more spattery arc and a marginally harder weld. Co2 is a more challenging gas to use on thin material and not all Mig Welders perform well with 100% Co2 as a shielding gas!
Mig Welding: machine setting the Right Parameters
https://bhartskills.blogspot.com/2021/03/MIG%20welding%20machine%20Parameters%20.html
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