[MW:2969] RE: /] demonstration of swps

A demonstration plate is required if Standard Welding Procedure Specifications (SWPS) are used in lieu of the usual qualified WPS - i.e. WPS qualified by a PQR.  This is discussed in ASME Section IX, Article V.  Since there is no PQR, a single test weld must be made using the WPS in accordance with QW-510 and recording the welding information per QW-510(d).  QW-510(e) specifies the testing to be performed:  " The coupon shall be visually examined in accordancee with QW-302.4 and mechanically tested in accordance with QW-302.1" (bend tests or nick break for fillets) "or radiographically examined in accordance with QW-302.2.  If the visual examination, radiographic examination, or any test specimen fails to meet the required acceptance criteria, the test coupon shall be considered as failed and a new test coupon shall be welded before the organization may use the SWPS."   

 

The advantage of the SWPS is avoiding the cost of performing the PQR testing:   bends, tensiles, etc and writing a WPS.  The disadvantage is that you must comply entirely with the requirements of the SWPS;  that is you may not modify the SWPS.  The SWPSs are limited in thickness and application.  Further, you cannot combine the SWPS with any other WPS.  A list of SWPSs permitted for ASME fabrication are found in Section IX, Mandatory Appendix E.

 

John 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari
Sent: Sunday, August 16, 2009 11:11 PM
To: materials-welding@googlegroups.com
Subject: [MW:/] demonstration of swps

Dear all friends

is demonstration similar to  PQR?why& when is carried out? 

REGARDS

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