Re: [MW:21456] Re: How many times PWHT can be done in a particular P-91 material joint with code reference

Repeated PWHT  can lower hardness and mechanical properties of P 91.

On Wednesday, July 23, 2014 10:36 AM, Jignesh Desai <jignesh.desai.met@gmail.com> wrote:

Normally two , but Two times repair is just an arbitrary statement, not supported by code reference directly, but this is basically good engineering practice and to some extent reliable one.

If you want to do three times repair, base materials & welding consumables shall be simulated for the three times to ensure it retaining mechanical properties after three cycle of PWHT time and temperature if undergoes PWHT

If you specific case, What you must do to take care : When running a PQR, also run additional repair PQRs. Repair once, twice, thrice..... with WPS conditions and subject welded coupons to mechanical tests (impact mainly) and see at what  level you have to stop. 

Regds/Jignesh

On Wednesday, 23 July 2014 06:19:42 UTC+5:30, pradipsil wrote:

Dear All,
How many times PWHT can be done in a particular P-91 material joint with code reference.

Regards

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