It's on now, wish me luck

IMO, Use the Co2/Argon mix gas. It makes for a "cleaner" weld. There's also different wire diameters for thicker/thinner material. I used the .025 wire to weld the sheet metal and the .030 wire for welding frame connectors,cage, etc. For sheet metal I did like 1001 spot welds rather than a continuous weld to keep the heat and warping to allmost none.

Hope this helps, Eric