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100% Ar is used for aluminum work in most cases. You really don't want to use it when migging mild steel, especially thin panels, IMHO.

Ar usually creates a deep, narrow penetrating weld. Not what you need when working on sheetmetal. The C25 mix is better as it will allow you good arc quality, easier puddle control, less spatter.



An argon mix works best with thin sheet metal (Mig Mix Gold is one of the trade names I've seen).