On Wed, 25 Jan 2006 08:00:32 GMT, Ernie Leimkuhler
wrote:

3/4" aluminum is not practical to TIG weld.
For aluminum heavier than 1/4" consider a MIG welder.
Much more efficient than TIG for heavy aluminum.

I didn't know that -- never having welded any aluminum much over 1/4"!
So what thickness of aluminum could be welded with something like a
Millermatic 210, Ernie?