Radiography (RT) Before or after PWHT
Radiography (RT) Before or after PWHT
(OP)
My question is should code required RT be conducted before or after PWHT. My opinion is after as the weld is not complete until all of the essential variables of the WPS has been met which includes PWHT.
RE: Radiography (RT) Before or after PWHT
RE: Radiography (RT) Before or after PWHT
RE: Radiography (RT) Before or after PWHT
All the rules are found in the construction code.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Radiography (RT) Before or after PWHT
A Great Place For Engineers to Help Engineers
RE: Radiography (RT) Before or after PWHT
RE: Radiography (RT) Before or after PWHT
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Radiography (RT) Before or after PWHT
RE: Radiography (RT) Before or after PWHT
RT is not good at detecting fine cracks. Furthermore, reheat cracks are frequently quite short.
Why do you suspect reheat cracking? It is typically associated with creep-resistant steels, but can happen in carbon steel.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Radiography (RT) Before or after PWHT
I'd have all testing done as required by the standard(s) before PWHT, and additional testing depending on the type of defects you'd suspect after PWHT (e.g. UT for most applications, macrography for microcracks).
RE: Radiography (RT) Before or after PWHT
In practice, and to ensure that PWHT time isn't wasted on a flawed weld, sample NDE can be done on sections of the weld in advance of PWHT - It depends how long your PWHT takes / costs compared to the time / cost of UT/RT
RE: Radiography (RT) Before or after PWHT
I did have one case where the data was corrupted and we had the weld seams involved re-examined. We also employed a third party, trusted Level III review the data as well as the original test calibrations, test setup, etc.