Don't treat. Get to clean metal. If you can do that by grinding, then grind, but more likely cut our sections and leave a clean edge for welding. Make your patches carefully to fit in the cut section.
Once they fit right, mix up a small batch of JB Weld and fix the patches in place with a dab of the JB Weld in the corners. This is just to hold in place, it is not structural.
Turn down the gas pressure on your wire feed, and turn down the amperage too. It sounds like you are blowing some of your material away with the gas. Just enough gas pressure to keep the weld spot flushed with the inert gas. Just enough amperage to be able to strike and keep the arc.
Get close to the work and support your welding arm/wrist with a brace. Do small sections at a time so as to not warp the patch or fender metal by getting it too hot for too long. You should have a bunch of small dabs of weld spots all the way around the patch edge. Knock the JB Weld off. Complete the fill in job with the welder, but allow it to cool often so it doesn't warp.
Once you have the entire edge line welded, go back with the grinder and grind it fairly smooth. Prime, and paint.
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