Thank you all for your excellent advice. Based on your information my search for the correct welder
has been dramatically changed. You all have saved me a lot of money even before a purchase has been
made.

Gratefully,

Chip A.

Thanks for the response, first of all. As to fleshing out the question...Aluminum will be the primary medium of construction. Up to1/4 inch thick should work for all fabrications. 90 degree angles with some reinforcing 45 degree straping will be used as well. The device being made will be free stand...

I am looking for a reliable tig welder that will be the center piece to a new company. So far I have seen an Airco 225 tig welder, a l-tec 225 migmaster welder, and a miller 320 a/? Tig welder. Aluminum will be fabricated almost exclusively. Any and all opinions on these, or any welder, as an option...