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I also use a Miller 210. I use .023 wire for sheet metal and .030 for heavier items. Gas for everything. Adjust your gas flow and play around with the heat and wire speeds. The chart on the machine isn't alway nuts on. For plug welds I usually adjust the machine up to the next thicker gauge of metal, so if it's really 20g I'll go 18g etc. I little hotter.
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same here, except i get lazy and hate changing wire so small sheet metal projects get .030. if i know im doing a lot, i usually change to the .023.
i love my 210, but now wish i would have spent the extra for the 251. there are projects where i need the 2.5 tap which doesnt exist.