Re: Re: [MW:28452] WELDING P11 WITH P91 STEEL

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. 

On Fri, 19 Oct 2018 9:21 pm muneebslsa@gmail.com, <muneebslsa@gmail.com> wrote:

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

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From: Kannayeram Gnanapandithan

Date: 2018-10-19 16:03

To: materials-welding

Subject: Re: [MW:28445] WELDING P11 WITH P91 STEEL

Weld 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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