Dear All:
An urgent question:
Base on Project tech Documents we have to do PWHT( in 870°C for 3Hours,Air Cooled) for welding of 2 parts as A312-347H(12.7mm) to A182-347H(6mm,) together((A182 is as a branch to A312). After performing PWHT we found some cracks(dept of crack are from 3 to 8 mm) Just in weld seam.
Joint Information:
Welding process: GTAM + SMAW.
Design Tem: 780°C and Design Pressure is 5.3Barg in convection coils.
Welding consumables are :E347H Esab, Wire ER347 esab.
Shall we repeat PWHT after repairing or not?
If reply is Yes, how much time shall be Holding time ?
Please let me know your STD reference As well.
Thanks
Bazrafshan
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