Kelley Mascher wrote:

: It TIGs quite well. For high quality welds you need to back purge
: minimally or preferably work in a pure argon atmosphere.
--If at all possible you'll want to do it in a big-ass glove
box..

: and it won't give maximum strength but it does hold.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--What he said. I'd be particularly concerned due to the
application; i.e. life saving. I've seen massively thick battlebot
armor (3/8" thick plate) that has ripped apart at the welds due to
*not* back-purging correctly. Something as wimpy as a rollbar would
probably fail under a much smaller impact..
--Also, assuming you're planning to use Ti tube you'll want to
bend it, yes? Not sure what this would entail but I'll bet it ain't
trivial... ;-)
--

"Steamboat Ed" Haas : Doodle doodle dee
Hacking the Trailing Edge! : Wubba wubba wubba...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---