American Welding Society Forum
In Gr91 material, shall we have to go for post heating and if so what are the uses of it? What is the time gap recommended between completion of welding and post weld heat treatment?
The answer to your first question is Yes, as Lawrence mentioned . The next question is hard to answer on this site. You can e-mail me and I would be willing to give you some more in-depth understanding of PWHT. PWHT is mandatory on all P91 material after welding. Immediate PWHT after bake out and the material has cooled to 200 Deg. f is recommended. But, EPRI (Energy Power Research Institute) and other industry SME's recommend no more than 7 days after welding and bake out to perform PWHT. EPRI is the leading organization for all things P91. They have a web site you can tap into. Some of their info is free and some is very expensive and requires membership. Be advised that this material requires detailed procedures for pre-heat, welding, NDE, hardness testing and PWHT and based on your post, I would highly recommend consulting SME's for assistance. This material, if not joined correctly can be very problematic and can be prone to failure.
Hi can anyone direct me to the book where i can find the requirement of postheating, temperature range and duration. I know that we do post heating after welding for CrMo steel, low alloy steel and carbon steel with CE>0.45% but i dont know which code help us to understand and perform it in the right way.
EPRI has some great information on this material. Look for EPRI doc# 1024713 (Creep Strength–Enhanced Ferritic (CSEF) Steel
Welding Guide) EuroWeld has some good information since they are very instrumental in assisting with the EPRI papers.
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