I found out it is Ti 6AI4V Going to use the 6AI4V ELI filler.

Thanks cj737

Thanks for the info Sandow. I will give that a try.

What filler rod would you recommend?

I have made contact with the shop that originally machined the shaft. No answer yet.And not sure I will get one.
Its a small diameter Hex shaft 1.25 inch. 1 inch round where the welding will take place and maybe .5 wide.

I have a titanium shaft that needs some build up and machining on the bearing journal. I do not know what grade of titanium the shaft is and was wondering what filler rod I would need to use. Would the #12 cup sold in Jodys store be a good choice for proper shielding? I will only be welding a half i...