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Re: [MW:34438] Re: Interpretation of Clause QW 407.2 of ASME SEC. IX

By Materials & Welding

Dear all,

following code interpretation clear all for above raised query.

Standard Designation:
BPV Section IX
Edition/Addenda:
Para./Fig./Table No:
Subject Description:
QW-407.1 and QW-407.2, Postweld Heat Treatment (2007 Edition)
Date Issued:
12/11/2007
Record Number:
07-1708
Interpretation Number :
IX-07-06
Question(s) and Reply(ies):

Background: A weld test coupon for a PQR was welded to itself using P-No. 1, Group 2 plate material and postweld heat treated at 1110°F to 1130°F (600°C to 610°C) for 10 hr. The PQR documents all supplementary essential variable notch-toughness requirements. Notch toughness is required and all qualification ranges are supported by the PQR for production welds.

Question: Will this PQR support a WPS that specifies a PWHT temperature range below the lower
transformation temperature, provided the time at temperature does not exceed 12.5 hr?

Reply: Yes.


On Friday, October 19, 2012 at 8:08:42 AM UTC+4 Harry Patel wrote:
Dear Mr. Satish.
 
This clause apply when impact test is applicable to job.
On Thu, Oct 18, 2012 at 4:53 PM, HAREESH K V <haree...@gmail.com> wrote:
Dear Mr.Sathish,

Which is your construction code for Welding Procedures? If it is Section IX, please refer QW-253; QW407.1 and QW407.4 are the only essential variables for smaw.

So you can use that PQR for making a WPS of the holding temperature given by you. But check if it is violating any metallurgical requirements.

experts please correct me if i am wrong.

Regards,

Hareesh K V


On Thu, Oct 18, 2012 at 12:56 PM, JASPAL SINGH <jaspa...@gmail.com> wrote:
Dear Satish,
 
From the data it seems that the material is either P4 or P5. Impact testing may be there either at -18 or -29.
 
The understanding of the clause is little logical.
 
" Procedure qualification test shall be subjected to PWHT essentially equivalent to that encountered in the fabrication of production welds"
 or including at least 80% of the aggregate times at temperature(s).
 
So in your case PQR is qualified with 95minutes PWHT.
 
But as per this clause lower limit is 32 minutes in the PQR. So your PQR is meeting the minimum requirement. But upper limit is essentially equivalant to the production which is 40minute but you have 95 minute. 
 
So in my openion you can not use this PQR, as it is not the true representation of actual weld conditions. 
 
Regards 
 
Jaspal Singh 
 
 

On Tuesday, October 2, 2012 5:36:27 PM UTC+5:30, shah satish wrote:
Dear All,
Hi,
I have a one PQR with PWHT,Heat treatment cycle is 660 - 665 Deg. C
Temp. and time 95 minutes, and my job  Heat treatment cycle 660 - 665
Deg. C. Temp and soking time 40 minutes (min).can i use this pqr for
job.

Thanks

Satish,

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