Dear All,
-- I have query about PWHT,
I have qualified WPS and PQR, as per B31.3.(But our requirements as per B31.3 and B31.1 )
Can you please tell me some one, what is difference between theses both standard for PWHT.
( As per my knowledge 1) PWHT temperature for ASME P number 04 material is different from ASME B31.3 (process) : range 704-746°C to ASME B31.1 (Power) : range 650-700°C.)
Below I have given some WPS parameters for PWHT, please clarify me whether the parameters are correct or Not.
According to B31.3 -
Material : ASTM A 335 P11 to ASTM A 335 P11 - ( PNo-4; G.No-1 to PNo-4; G.No-1 )
Process : GTAW
Test coupon Thickness : 19.05 mm
PWHT- Temp range - 690°C- 705°C
Heating range : 200°C/hr
Cooling range : 200°C/hr
Interpass temp : 315°C
Post Heating : 300°C -350°C ; holding thickness 10mm to 20mm -30 min / 20mm to 30mm - 90min.
And regarding Backing - PQR is qualified with Argon, can we use Nitrogen in WPS.
Experts i am looking your favorable reply on my query.
Thanks
Kiran
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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