Quote:
Originally Posted by my67chevytruck
I have seen ppl use straight o2 for mig welding. I thought straight argon was for aluminum and stainless, but i could be wrong.... looks like a great deal on the cab...
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You are getting your gasses mixed up. You can use C02 straight or a mixture of argon CO2, but not O2 (that is oxygen) that is what you are trying to drive away with the shielding gas. Pure argon is used for Aluminum but a 75/25 mix is sufficient for SS. There are all kinds of trimixes that are available for these welders but I tend to stick with the basics for normal everyday welding.