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RE: [MW:11918] P-11 with purging

By Materials & Welding

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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