Interpass Temperatures on P91 Piping
Interpass Temperatures on P91 Piping
(OP)
Hello,
I have a question about interpass temperature requirements for P91 piping. We are attempting to qualify a robotic welder to perform continuous girth welds and branch connections to 6" pipe. We are concerned that the base metal temp will exceed the typically recommended 550-600°F interpass maximum. What sort of detrimental effects will this have on this particular grade of pipe? Can they be eliminated with a normalize and temper process? We are fabricating small pressure vessels, so heat treating of the entire assembly is possible. Any advice would be appreciated.
Thanks,
jdfife
I have a question about interpass temperature requirements for P91 piping. We are attempting to qualify a robotic welder to perform continuous girth welds and branch connections to 6" pipe. We are concerned that the base metal temp will exceed the typically recommended 550-600°F interpass maximum. What sort of detrimental effects will this have on this particular grade of pipe? Can they be eliminated with a normalize and temper process? We are fabricating small pressure vessels, so heat treating of the entire assembly is possible. Any advice would be appreciated.
Thanks,
jdfife





RE: Interpass Temperatures on P91 Piping
This is very important for field welds that will be subcritically post weld heat treated. If you intend to re-heat treat the welded component, I see no problem.
So,
Yes. The entire component should be subjected to a normalize and temper heat treatment.
RE: Interpass Temperatures on P91 Piping
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RE: Interpass Temperatures on P91 Piping
Thanks again,
jdfife