He is an extremely good welder, i am in no doubt he can do the job just fine…
But it is impossible for him to do the job correctly without knowing what material he is welding.
There are a massive number of titanium alloys out there and as many rods to match the material.
Maybe my question should have been does anybody know what the spec is of the downtube on a Ti On-One Inbred?
I should add, i have been a structural welder for 20 years so i sort of know what i am on about….but not when it comes to TIG work.