<putting on my engineering hat>
Titanium is hard to work and is an expensive alloy.
I don't know how it would fare being used as a blade however from what I've seen of it being used in some of my industrial applications I would say that you are best to use a high carbon steel and leave titanium for the experts!
Welds can be difficult to make and are very prone to cracking so need full crack & penetration analysis prior to release, plus I dont know if manufacturers are making titanium filler rods or welding wire.
<removes engineering hat>
I would ask that with so many well made weapons available in steel, why anyone would want to mess with titanium...?