Appendix 31 applies only to very specific materials and for special applications of 2¼Cr–1Mo. It is neither to be applied outside those conditions or to be interpreted as universal. Section IX is consistently clear that the temperature range ONLY refers to the broad groupings of QW-407.1. There exists no justification to restricting the range to ±14°C (±25°F) universally.
I heartily recommend that people resist imposing the most severe restrictions required for only a few selected situations and trying to apply them across the board.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prakash Hegde
Sent: Saturday, January 05, 2013 12:50 AM
To: materials-welding@googlegroups.com
Subject: 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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