[AR] Re: fiberglass conduit
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Tue, 11 Jan 2022 18:20:18 -0500 (EST)
On Wed, 12 Jan 2022, Troy Prideaux wrote:
There are also some practical fabrication advantages with Ti – it’s much
easier to weld compared to Al-Alloy and I don’t think you need to
retemper post welding and you don’t need to mix in different grades of
alloy to weld like you do with something like 6061.
But be very sure you're using the right welding procedure and weld wire.
Using the wrong weld wire (straight Ti rather than 6Al-4V), plus some
generally sloppy quality control and extensive pressure cycling, once
resulted in a spherical helium tank's girth weld letting go under pressure
on a test stand. One hemisphere went down into the flame trench. The
other went up through the full length of the stage and out the top, and
was never seen again. Followed closely by the Earth Shattering Kaboom as
a fully-fueled S-IVB with a 2ft hole suddenly punched through it, let go...
Henry
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