Your easiest bet would be to try bolting it together. I personally never welded Titanium but heard its a pain in the neck. even aluminum can be a pain if you dont have a good welder because you gotta pulse it right
How did you manage to get that far and not know it's titanium? I sure home you werent using feeds and speeds for a softer, easier to cut material.
TIG, argon with diffuser cup, and non-thoriated electrode.