Looks rather simple, check out this oldie:
http://www.overclockers.com/tips437/
I'll make my own for the air measurements, for now.
This welder's insanely expensive:
http://www.tiptemp.com/Product.aspx?ProductID=4002
(TIG welder)
Another one, slightly cheaper:
http://thomasregister.com/olc/smartc...xtcolor=000000
with details here:
http://thomasregister.com/olc/17183047/twospec.htm
A 35 Vdc to 75 Vdc source, 250 Joules (watts/sec) capacitive discharge.