Hi,

Residual stresses in welds are relieved during annealing or solution heat treatment. When these heat treatments are not required to produce desired properties in the weld, a stress relieving heat treatment might be applicable. Such a treatment can be beneficial in maintaining dimensions, reducing cracking tendencies, or avioding stress corrosion cracking with certain alloys, but it can be detrimental in some cases. Thermal stress relieving might alter the mechanical properties of the weld zone by an aging reaction with heat treatable alloys. This response might reduce the beneficial effects expected from stress relieving because of reduced weld ductility as a result of aging.
For commercially pure grades, stress relieving temperatures range from 900 to 1100 degrees F. Temperatures for alpha alloys, depending on the type, can range from 900 to 1200 degrees F. Temperatures for alpha-beta alloys, depending on the type, can range from 900 to 1300 degrees F. Temperatures for beta alloys, depending on the type, can range from 900 to 1350 degrees F.

Hi!
I agree with swnorris! What it comes down to is what specific type Ti you are working with. If you do a search here for Titanium welding, you'll find quite a few posts with links to Ti manufacturers that have a bounty of information that should answer your query in greater detail provided that you know the specific type and thickness of Ti you work with.

Respectfully,
SSBN727 Run Silent... Run deep!!!