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[MW:35624] Can we avoid PWHT for P No.5A to P No.1 , 10mm weld joint ?

By Materials & Welding

Dear Sirs ,

 

We have a project with both shell and Reinforcement Pad materials SA516-70, 10 mm Thk ( P No.1 ) and the Nozzle is SA335-P22, 4" Sch 120 , 

11.1 mm ( P No.5A ) Thk.

 We already have a qualified WPS & PQR with 8mm GTAW and tested about 10 years ago by other welding engineer, for P No,.5A to P No.1 without PWHT and it was satisfactorily passed and we 

have used that WPS & PQR for the previous project 10 years ago and no 

issues found without PWHT.

 Now for the new project, we are going to use the same WPS and apply 

Preheat ( 204 to 250 Deg C ) as per the WPS for 10mm Shell Thk by 

multipass welding, refer to the below sketches.





So, i would like to confirm whether PWHT is mandatory as per UCS-56-4 ?

Can we avoid PWHT for this 10mm weld joint ?


Or Should we do buttering with ERNiCr-3 on P No.5A bevel and butt weld 

with same filler for this dissimilar joint to avoid PWHT after making new 

PQR with buttering?


Please confirm soon.


Thanks and Regards,

Saravanan Sornam,

ANSAN-Si,

S.Korea 

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