Welding titanium isn't hard
its a bit of a pain but only because it needs perfect shielding from air, other than that its very similar to welding steels.
I think there's a shroud of mystery been formed about titanium as not many people us it, it might be that I live in Swansea so have IMI Titanium and a TIMET plant nearby so as a welder I've been exposed to it a bit more than most welders.
Buit for me its quite low down on the scale of difficulty when it comes to welding, infact I'm always happy when I get a titanium job as I know when I get there its going to be a spotlessly clean job
give me that over an inconel riser in an ethylene plant any day of the week