If you have a Lincoln welder (mig), their aluminum kit comes complete, you install it and go. I had really good luck with mine. And yes, you do have to abrade the surface with a NEW, aluminum only cleaning stainless steel brush (don't use the brush for anything else).
Anyhow you look at it, those welds look GOOD!
Clois...practice practice practice (and when you give up take a welding class at your local JC..best $ I ever spent!).
