Using CO2 (the 25 in 75/25) is controversial. The little nubbies you see on a non-back-purged SS weld are carbon based, and having CO2 present doesn't prevent them from forming, and increases the carbon content of the resultant weld, resulting in it being more brittle.
On the other hand, there are folks who claim it works well...
Your decision, but I don't do it. Argon all the way for me.
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