I realized today doing some cursory checks on copper vs. aluminum
prices that you can nearly purchase a small TIG welder with the savings
of using aluminum instead of copper in a big magloop (think 10' square,
2" tubing low bander). I think it even holds true if you use larger
diameter aluminum to make up for the lower conductivity of aluminum vs.
copper.

Just a thought if you've always wanted to use aluminum in a large
magloop but went to copper because you couldn't figure out how to get
low-resistance joints in aluminum!

73,
Dan