Re: [MW:16441] QW407.2 (ASME Sec. IX)

Dear Mr Hussain

For Soaking temp Following is my explaination which is concluded from varios AI/AIS (eralier I was also objecting to Temp range but later got convinced due to various actual Impact value results verses Temp ranges)

i) As such it is not clear  about the temp band in ASME code but every time it is raised the question  and objected  for following condition

a) If you have qualified the PQR  of P1 with PWHT temp say 600-615C then you can not use the PWHT temp at say 650 C even it is below lower critical temp  as technicaly the Impact valuse diffrer(Some time it deteorates the UTS and also Impact ) Therefore indirectly we reqquire to restrict the temp band as per qualified PQR This is metallurgical explanation

b) Now from where this 14Degree comes from? If you refer Mandatory Appendix 31 of ASME sec VIIIDiv 1 you will see that it restricts the Temp band for Two condition for PQR qualification for LAS P5A This explaination Holds good and convincing to any spec. whcih I followed later

 

Hope this will clear your doubts

Regards

Hegde P.B.

Welding Consultant

Pune

From: Tariq Hussain <tariqhussain632@gmail.com>
To: materials-welding@googlegroups.com
Sent: Friday, 4 January 2013 9:24 PM
Subject: Re: [MW:16435] QW407.2 (ASME Sec. IX)

Dear Mr Hegde,

Thanks for your reply and interest in the subject.

1. Yes that is very basic thing that QW-407.2 is only applicable in case of Impact testing requirements are YES for Production welds / Components.

2. For Soaking Time, it is OK and clearly written in Code. But I think PQR soak time should be at least 80% of that required for Production Welds. There is no question about it.

3. Regarding Soaking Time, Can you please give some reference / logic for controlling Temperature with 14 Degrees?

Regards

Tariq Hussain 

On Fri, Jan 4, 2013 at 11:27 AM, Prakash Hegde <pb.hegde@yahoo.com> wrote:

Dear Mr Hussain

PWHT QW 407.2 is applicable in case of suplimentary essential i.e. When Weld has to undergo Impact test6

In this case Soaking time for Production coupon or ajob should be at least 80% of the soaking time of relevent PQR qualified And Soaking Temp  should be  with in 14 degree of the of the soaking  temp of PQR qualified (i.e If your PQR is qualified at  Soaking temp say 600-615C then your Job / Test coupon also should be heated in thyis range and Not at say  above 615C Even though  this temp is below AC1

Regards

 

Hegde P.B.

+91880559304

From: Tariq Hussain <tariqhussain632@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, 2 January 2013 5:26 PM
Subject: [MW:16407] QW407.2 (ASME Sec. IX)

Dear All,

We need little help from you regarding below query for ASME Sec. IX QW-407.2

 

Is it intention of QW-407.2 to have Production Welds Soak Temperature (Vessel Soak temperature) exactly same as that of done in PQR test Coupon?

Thanks in Advance

Tariq Hussain

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.