I believe one of these has been posted before, but not both.
From HackADay.com, here are links to what's being termed a "Junkyard" DIY TIG welder, and a "Commercial-Grade" DIY TIG welder.
Junkyard: http://www.hackaday.com/entry/1234000250050190/
From HackADay.com, here are links to what's being termed a "Junkyard" DIY TIG welder, and a "Commercial-Grade" DIY TIG welder.
Commercial-grade: http://www3.telus.net/public/a5a26316/TIG_Welder.html
Junkyard: http://www.hackaday.com/entry/1234000250050190/