Titanium welding wire has excellent corrosion resistance and therefore has unique challenges. Promoting the reactivity of the elastomeric layer that protects it also makes soldering difficult. In addition to choosing the right titanium weld filler wire, the shielding gas plays an important role in ensuring high-quality weldments.
link:https://www.hst-titanium.com/titanium-welding-wire/titanium-alloy-welding-wire.html