NDT after PWHT.

First, NDT was performed pre PWHT, even if only VT, probably even Surface or usually some Volumetric Test. Point, does PWHT change chemistry or molecular structure of weld and parent metal? I have found that it does and after 30 years of B.31, I suggest NDT gets performed after PWHT to ensure integrity.

Hi Ser,

Thanks a lot for your support. our pipe 400 mm sch 120 material A333 Gr.6 welding to pipe A333 Gr.6. PWHT only for welding joint base on ASME B31.3.

Thanks and Best Regards,

You are welcome!!