On Sat, 23 Aug 2003 01:44:47 GMT, "Steve Thomas"
wrote:

:Has anyone on this list ever welded a thinwall 4130 frame with a MIG welder?

Most aircraft welding is done TIG

:
:What is a good source of 4130 seamless and welded seam tubing?

Dillsberg Aero. They don't have a website, but you'll get their
address if you google them.