No discoloration acceptance criteria for titanium welds under ASME IX?

[kingnero]

For both welder performance and for welding procedure qualifications, I did not find anything that limits the discoloration of titanium base material under ASME IX.
Am I correct, or is it hidden somewhere else apart from QW 452, QW 302 and QW 194 ?

I am aware of the existence of AWS D1.9, can I somehow refer to that standard to not accept a rainbow colored titanium weld that was performed under ASME IX qualifications?

 

[FormerAIS]

Unfortunately, ASME doesn't really address titanium too much simply because it isn't used often in pressure vessel construction.

That stated, ASME is the minimum. Depending on the purpose, using other criteria available to justifiably critique welds would indeed be ok, in my opinion.

Even if the color 'passes', ASME would require a mechanical bend test in order to pass the minimum qualifications. Typically the color discoloration is used as a Non-Destructive "Go/No-Go" test anyway, so having the mechanical test data as well as the discoloration should be adequate enough.

Quality is not an act, it is a habit - Aristotle

 

[kingnero]

Thanks for your insights! I believe I can do something with this information.

 

Discoloration of metals is outside the purview of ASME IX.
A little googling revealed the following links

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."