Do not advertize this or any welder as a "mig" welder if it dirs not come with a regulator or flow meter to use a shielding gas. That is what a mig welder is... "mig" is METAL INERT GAS ! If it does not perform this type of welding it is Only a "wire feed welder" never a mig welder
This is indeed a MIG welding machine, but it can be used without air. You can search for VEVOR MIG145 on YouTube and there will be instructions on how to use it without air.
Can I use gas & CO2 with this machine ? Or would I have to use the 250 Vevor ? I'm taking a mig & stainless steel test in October and the company uses a mix of 75/25 . So I want to use gas to get comfortable with my settings.