quatle,
If you perform RT before PWHT and UT after PWHT you are asking for trouble.
Numerous linear defects can be missed by RT and the weld deemed acceptable (especially lack of sidewall fusion)then the weld will be rejected when it is UT tested.
What is the material ?
What is the applicable code ?
ASME B31.3
(a) For P-Nos. 3, 4, 5A, 5B, 5C, and 15E materials, examinations shall be performed after completion of heat treatment. However, examinations need not be repeated on welds or portions of welds that are subjected to additional heat treatments and have not been repaired by welding.