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Welding on titanium grade 3 seal shaft

Hi , my pleasure for contacting your site by yahoo search.

We are going to weld a seal (drive ) shaft with L= 1500 , and Diameter of 320 mm. We have some mechanical corrosion on the surface with depth of 2-3 mm along 650 mm of the shaft , the area which Mechanical seal have been installed. Because of this unfinished surface there is no good fit between seal bearings and many times we had failure of mechanical seal.
So please advise the right way for shaft build up and welding and if there are some possibilities of shaft bending or stress.

Respectfully yours.

Sepahdar Ansarinik
Plant Manager - Iran
May 22, 2010

Considering the base material and depth of the actual defects my choice would be thermal spray and grind. No heat distortion. HVOF is preferred in many applications and mandated for some critical ones. But I still have a doubt, Are those defects really corrosion? If so, what is the environment the shaft is seeing?

Guillermo Marrufo
Monterrey, NL, Mexico
May 31, 2010