Mig welder settings

[pepo1]

Hi there,

I want to start learning to mig weld so I can patch up my car. Bought this little 175 Xcel-Arc welder second hand but cannot find any information on the settings. There's no handy chart on it. Just wondering if anyone can give me some basic starting settings : Gas (75-25 Argon-CO2), wire feed and voltage settings. I guess using mainly 18-20 gauge steel for panels, but also heavier gauge, say 2-3mm for chassis stuff.

Any help greatly appreciated.
Paul