Section in QW-403.19 (when joints are made between two different types or grades of base material, a procedure qualification must be made....) is associated with inertia and continues drive friction welding (QW-262) and flush welding (QW-265). If you want to use this process, you have to qualify a new welding procedure, because there is different grade.
If impact is required by the project specification and/or any section of the code, different grade becomes an essential variable. You have to specify grade of material in the WPS.
However, if impact is not required, group no- is not an essential variable. Therefore, it does not matter which group no- is used. You have to consider the P-No.only.
Rgds,
Dear Vijay,
Please refer to QW-403.5 of ASME Sec IX.
It states " When base metals of two different P-Number Group Number combinations are qualified using a single test coupon, that coupon qualifies the welding of these two P-Number Group Numbers to themselves as well as to each other using the variables qualified."
Hope this helps.
Regards,
Sadique
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vijay Katkar
Sent: Sunday, November 13, 2011 9:30 PM
To: materials-welding@googlegroups.com; nandeshkumar@rocketmail.com
Subject: Re: [MW:12969] Supplementary essential variable - Group number As per section IX
Dear Nandesh,
Thanks for reply
But if toughness requirement is applicable then group number will be essential variable. as per QW 252 change in group number call for qualification.
please give me any reference in the section IX.
Regards
vijay katkarOn Sun, Nov 13, 2011 at 4:09 PM, Nandesh Kumar <nandeshkumar@rocketmail.com> wrote:
YES.
As per SEC IX, any combination of P1, G1 materials can be welded in any combination to P2, G2, provided Impact test requirements are fulfilled.
Nandesh
From: Madhusudan Rout <madhusudan.rout@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, 13 November 2011 4:37 PM
Subject: Re: [MW:12964] Supplementary essential variable - Group number As per section IX
Yes u can use As per SEC-9. QW-420, base metal grouping, 2010 edition.
On Sat, Nov 12, 2011 at 9:14 PM, Vijay Katkar <katkar.vijay22@gmail.com> wrote:
Dear All,
please sheared your valuable experience for following situation,
I have PQR with P No-1 Gr No-2 to P No1 Gr 1 combination with impact testing. Can i use following combination with same PQR For impact application.
1) P No-1 Gr No-2 to P No1 Gr 2
2) P No-1 Gr No-1 to P No1 Gr 1
3) P No-1 Gr No-2 to P No1 Gr 1
If above combination's are possible please provide code reference of ASME section IX or ASME section VIII.
Regards
Vijay Katkar--
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