I know you said that you were sending your cooker to a relative, so he could do the Stainless Welding. I went to a Welding school in Tulsa, my teacher was the man who said whether or not, if you welded on the Alaskan Pipe Line. He was a Master Welder. Anyway, I was trying my hand at welding Stainless. The Secret to great Stainless Welds is this; it likes to weld COLD. Weld about 1 inch and let it cool. If the piece is 24 inches, per say, start at the beginning and weld 1 in. move down 6 in. weld another inch and so on. KEEP YOUR STAINLESS COOL or IT WILL BURN. Try it.
Aluminum, is just the opposite. the hotter the better. Roy even suggested using a torch to heat the aluminum before welding.
Hope this helps someone someday,
SmokinMad