Welding Aluminum

["Tom Neimeyer" <tneimeyer@houston.rr.com>]

LSR Types,
  I have a big Miller 250 amp AC/DC welder (industrial machine).  I use it
to heli-arc carbon steel & stainless and do some stick rod welding.  I do
not have a high frequency unit to weld aluminum.  At times, I would like to
weld aluminum.  Can I buy a spool gun and run Mig (alum) with this?  Does
anybody use a spool gun?  Pros & Cons of doing this.

Your thoughts are welcome and needed.

Thanks, Tom