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Originally Posted by KRUZR
Most migs have approximate settings inside the lid,practice the settings on what gauge steel your using. Be sure to have a good power supply to the machine for best results.Use a heavy xtension cord plugged close to the sevice panel....good luck
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Kruzer is right, however I think those settings are more for continuous Welding (don't know anyone who would do much of that on 18-20 Gauge though

) than spot Welding 18 Gauge-I have mine set one "click" higher (hotter), and the Wire speed faster than my Machine suggests for 18 Gauge (again, this is on a Lincoln 175 Mig)-doing so, mine will put down a nice, hot, flat spot-Weld with good penetration-I would suggest you try a hotter setting up to burn-through then back off (of course, use a practice piece for your test)-