I am assuming root pass is GTAW or GMAW;
The general non-essential variable QW-408.5 will apply unless the base metal is included in the P-No. groups listed in QW-408.9 ( an essential variable for those specific groups). As your material is not included in QW-408.9, only the non-essential variable QW-408.5 applies. A non-essential variable may be changed without requalification. However, you may need to write a new WPS or revise your existing WPS to permit the use of backing gas.
Hope this helps.
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of KINHUI KANG
Sent: Monday, July 25, 2011 9:48 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:11913] P-11 with purging
Dear Dinesh,
This essential variable QW-408.9 only applicable in deletion of backing gas, not addition.
Best regards,
Kang
Date: Mon, 25 Jul 2011 17:19:38 +0300
Subject: Re: [MW:11910] P-11 with purging
From: som.din@gmail.com
To: materials-welding@googlegroups.com
QW-408.9 For groove welds in P-No. 41 through
P-No. 49 and all welds of P-No. 10I, P-No. 10J,
P-No. 10K, P-No. 51 through P-No. 53, and P-No. 61
through P-No. 62 metals, the deletion of backing gas or a
change in the nominal composition of the backing gas from
an inert gas to a mixture including non-inert gas(es).
IT IS NOT CLEARED THAT FOR P11.
REGARDS
DINESH
On Mon, Jul 25, 2011 at 4:15 PM, Morin, Darcy (Bantrel Management Services) <MorinD@bantrelmanagementservices.com> wrote:
According to ASME IX QW-256, QW-255, the deletion of backing gas is considered an essential variable. But, the addition of backing gas is not an essential variable. This means that if you add a backing gas, a new WPS is not required by ASME IX.
However, your customer's specification may require a new PQR, with a new set of mechanicals, reflecting the purged condition..
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pradip kumar sil
Sent: Saturday, July 23, 2011 9:29 AM
To: materials-welding@googlegroups.com
Subject: [MW:11877] P-11 with purging
Hi,
I have one ESTABLISHED WPS for P-11 which is not purged by argon but as per our client specification purging is required for P-11. Can anybody tell me can i use ESTABLISHED WPS for with purged condition. For that one, what is the criteria & where it is written in code.
Regards
Pradip
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