I agree, last time which we did was P91+P22, but not with the combo of P91+P11, below are the listed qualified, so as per below trailing mail we have to go for pub piece.
These are the combo we made PQR.
| Grade | P-No |
| P11 + CS | P4+P1 |
| P11 + CS | P4+P1 |
| A 312 + A 106 Gr.B | P1+P8 |
| A 312 + P11 | P8+P4 |
| P22+P11 | P5A+P4 |
| P91+P22 | P-No.15E+P5A |
| A 312 + P22 | P8+P5A |
| A 312 + P22 | P8+P15E |
| P11 + CS | P4+P1 |
| P22+P11 | P5A+P4 |
| P22+ CS | P5A+P1 |
| P91+P22 | P-No.15E+P5A |
Welding with pup piece you get one similar and one dissimilar obviously you will have two Weld joints, in this case you have to have two pqrs or you have to prepare a dissimilar pqr incorporating similar, possible? with pwht values within the tolerances? Filler etc?Welding without pup piece Piping we have did same scenario with dissimilar pqr for power generation high steam boilers.On Sat, Oct 20, 2018, 4:01 PM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:When u weld P11 directly with P91 and then SR at 760°C will be very close to Lower critical temperature of P11 material. So better to have pup piece in between them.----Firstly, I do not understand the consequences of all 3 for what is the purpose?
Secondly, ok if you are doing butter there may be some purpose but scenario 1 and 3 why?
I feel like scenario 3 pub piece for tie in? Or shut down? If this is the case I agree with scenario 3.
Or
Scenario 1.
Still the questionnaire has deep knowledge of scenario than the one who is giving answer, to be precise, need more clarity for more information.
Regards,
Muneeb.M
Date: 2018-10-19 16:03Subject: Re: [MW:28445] WELDING P11 WITH P91 STEELWeld p22 and P91 (Pup piece) and SR. Then join p11 with p22.--On Fri, 19 Oct 2018 4:27 pm DDN VERMA, <vermananhu@gmail.com> wrote:--Dear Sirs,I read several methods to join a P11 [1.25 Cr- 1/2 Mo] pipe to P91 [9Cr - 1 Mo] pipe, such as :1. Weld using filler metal corresponding to corresponding to [2-1/4Cr - 1Mo] steel & post weld heat treat at appropriate temp..2. Butter P91 with filler corresponding to [2-1/4Cr - 1Mo], post weld heat treat & weld with P11 & re-post weld heat treat it.3. Use a P22 pup piece to join P11 with P91, etc. etc.....However, I wish to know, which is the most appropriate method taking into considerations the overall weld-integrity and high temperature strength of the weldment.Please help to clarify my doubts.THANKS,DDN VERMA
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