On 22 May 2025, at 2:26 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:
--Why do you use P22 nozzles on CS?On Thu, 22 May 2025, 16:24 PARAI Reaction Channel, <saravanshyla@gmail.com> wrote:--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.
<image.png><image.png>
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
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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