P8 material WPS to comply QW 407.2_PWHT temperature_time

[manivannan hemu]

Dear All,

I have a Query.

We have a SMAW-WPS [ASME SEC IX] for material P8/G1 – PQR with CHARPY tested. In this PQR it was post weld heat treated to re solution anneal at 1090 DEG C for 2 Hrs.

Now we have new production weld requirement  on a part of 8 inch thick with PWHT [solution anneal] at temperature 1130 DEG C and soak time of 7 hrs.

Please clarify me, is it acceptable to revise the WPS [with the same PQR] to address PWHT temperature as 1130 DEG C, and time as 7 hrs to utilize for the new production weld.

In doing this I considered QW407.1(b) (2) ‘PWHT within specified temperature range’ – in this case specified temperature range for solution anneal as 1040 DEG C minimum by ASTM A351, and NO maximum is specified.

I appreciate your response with the intent requirement of QW 407.2

Regards, MANIVANNAN.P

[jaya anil]

In this case , you need to qualify new PQR. 

Read ASME Section IX QW 407..clauses.

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[Praveen Kumar]

Dear Mani

If you have impact requirements the clause 407,2 also applies , in that case  the requirement of new pqr is needed. 

Secondly the long soaking time of 7 hours , will have some deteriorating effect on ASS, Kindly check that also. 

[Manivannan Hemu]

Dear Praveen,

Thanks for the input. My specific doubt is still pending. Why should i need to do a new PQR, even  QW 407.1 [b] may be valid,may allow to have WPS revised for PWHT time and temperature?

Another one is what deteriorating effect of long PWHT hold time, since this time is fixed based on the job thickness -  is greater of 7 inch, and its mid section needs to have an acceptable micro structure.

Please clarify.

Thanks,

MANIVANNAN.P

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[George Dilintas]

You have to read QW-407.1. 
according to this paragraph for P-number 8 it is up to you to define the "specified temperature range". So, remember that ASME BPVC is not a Handbook and look in the bibliography what is the acceptable temperature range for solution annealing

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[Kannayeram Gnanapandithan]

why u want 7hrs, as per code it is only 20minutes/inch

I think, u can use ur old pqr , pl ref qw 407.2

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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