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Dear All , In B By Date The first question that comes to mind is whether you are welding P5B or P5E base metal or not. If you are not, the requirement does not apply.
Best regards - Al. By Jovi Zhu Date Edited Toey, What base metal s are you dealing with? If you are dealing with Gr.
If the fabrication schedule requires the weldment to cool to room temperature prior to PWHT, a 4 hour bake-out at the preheating temperature is a good starting point. Shorter times at higher temperatures are also common; e.
However, maintaining preheat or use of a post bake can minimize the potential for inadvertent contamination and reduce the risk of stress corrosion cracking SCC. With this clue I am inclined to believe that the B Let me know your thoughts. Have a great day.
Good info. It just say Pre heat , Dehydroyen and Post weld Heat treatment and Interrupt welding not show intermediate heat tretment. By js55 Date Not sure if the original question has been adequately addressed. The intermediate heat treatment in the pressure piping codes does indeed pertain to post weld 'bake outs' with the intent of hydrogen evolution.
These requirements have a long history. By Date Edited Be cautious about mixing apples and oranges. Terminology differs from one code to another and the philosophy differs as well.
An attempt to use a different welding standards than that specified to justify a practice or deviation from a code requirement can create more problems than it solves. Inspection personnel are responsible to ensure the design requirements, procedures, etc.