Welder: Hobart Handler 140
Current fill: 75% Argon/25% CO2
I have some stock exhaust downpipes to weld on. Car is an Audi, some have guessed 409 SS but I haven't been able to confirm. At any rate, I've read in my manual that the tri-mix is recommended but my AR/CO2 tank is new and would prefer to not trade it in. Is the tri-mix needed to maintain weld strength or only to maintain the non corrosive/rusting characteristics of SS? I don't want weak welds, so I'll get tri-mix if that's the case. However the exhaust is not polished and not seen, so if it should tarnish/rust a little from using the AR/CO2 it won't bother me.
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