Let us know how the copper backing bar works. I just bought a chunk of copper for that purpose. In all my years of welding I've never used one.
A little tip for starting a patch weld .... ever notice how the initial welds are a bit tall and lumpy? I'll use a propane torch and warm the area a bit first, helps the welds lay down flatter as opposed to starting on a cold panel. Only really necessary in my shop during the winter when the shop is around 50 degrees. Seems to help as the welder is turned down low as to not punch through the metal, which can make the welds kind of "tall" until the whole panel gets warmed up.
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