Sayeeji,
I maybe wrong (again), but if you refer to UG-84(f),which deals with impact testing of welds, it cross-refers to UCS-85.
Needless to say, I agree with GRoberts.
Bmoorthy,
Code clauses UG-84(i)(1), AT-203(a) & AT-203(b) address the issue. For Category A joints the PTC has (shall) to be welded as an extension of seam unless it is impractical (hemi-head to shell). For category B joints where a separate ptc is reqd (on account of different welding...
I agree with John's comments.
One can also apply the requirements of the ASTM standard A923-01 titled "Standard Test Methods for Detecting Detrimental Intermetallic Phase in Wrought duplex Austenitic/Ferritic Stainless Steels".
dvkulkarni