As an old body and fender guy, with a box full of hammer's, I resent that remark, my hammer's made me a helluva lot of money. end of sarc. ;-)
The show could use a welder, not some Tig Welding Queen. By Welding Queen, I mean someone who just sits on a chair and Tig weld's small part's, i.e., part's less then 3/16." Had they had a certified welder when the were restoring that Mortar Rocket Launcher, they simply get a piece of similar tube / pipe stock, cut & replace, maybe an hour to an hour and half worth of work, with what is called a "Full Penetration Weld."
Using 0.45 to 0.65 Flux Core Wire, with a shielding Gas 75% Argon, 25% Co2. Because of the location of the weld in reference to what would of been needed to be replaced on the Mortar Rocket Launcher, I wouldn't bother to run gas inside the pipe while welding, so as to have a smooth bore. It was so close to the end, that if a smooth bore was necessary, just put it (Mortar Rocket Launcher Tube) on a lathe, cut/clean up the weld (inside the tube) your, done. NEXT (item to be welded)!
lol Maybe you should go and work for them. They could most likely use you!