Gary:
If you don’t have argon, forget about welding titanium. Get some
silver solder wire from Stuller or form the developer David Brown in
San Diego that is made for welding titanium. Grind the break back a
little on each side and at an angle and “tin” the ends with the
silver solder. Regring the ends forming an open v between them and
weld filling v with more solder.
I learned this technique 3 or 4 years ago from David and have had
very few welds fail.
If the weld turns blue, you are screwed.
JB