Thanks for the input. I have actually been doing all of that and have had get success welding in the 18 gauge patch panels. It's when I started to weld in the 22 gauge patches I ran into the blow through issues. Did some more practicing last night and had what I consider a big breakthrough in my und...

I have read that when stitch welding thin metal it's best to set the welder to the next thicker gauge to help reduce heat and warping. So far that has really worked. I have stitch welded a few 18 gauges pieces into my car with great success, but now that I'm on to the thin 22 gauge stuff I'm having ...