I would be using .023 for the sheet metal. It's much easier to control burn through with the thinner wire. Also, AirGas Gold argon mix works really well with the thinner sheet metal. :2:
Heres another good resource for MIG.
http://www.millerwelds.com/resources...ur-skills/mig/
Heres another good resource for MIG.
http://www.millerwelds.com/resources...ur-skills/mig/
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