Welding P91 to Stainless Steel
Welding P91 to Stainless Steel
(OP)
I am looking for guidance in understanding the potential drawbacks in performing a dissimilar weld between P91 and stainless steel pipe. This would be a socket weld joint.
A contractor is proposing to make these welds and then PWHT the P91 and stainless at the same time. I have read that the P91 side should be buttered then put through the PWHT cycle, then welded to the SS without PWHT. This doesn't seem practical for a SW joint.
My concerns are:
1. Sensitization of the SS due to PWHT
2. Expansion issues. Would this type of transition (from P91 directly to SS) concern you?
Any advice? Thanks!
A contractor is proposing to make these welds and then PWHT the P91 and stainless at the same time. I have read that the P91 side should be buttered then put through the PWHT cycle, then welded to the SS without PWHT. This doesn't seem practical for a SW joint.
My concerns are:
1. Sensitization of the SS due to PWHT
2. Expansion issues. Would this type of transition (from P91 directly to SS) concern you?
Any advice? Thanks!





RE: Welding P91 to Stainless Steel
Whereas the pipe will no doubt operate above 1000F, sensitization of the SS is inevitable.
RE: Welding P91 to Stainless Steel