The strength is not an essential variable even though the Tensile Test is
essential part of the Procedure Qualification. Hence the PQR in your case,
can support both P=1, Gr. 1 and Gr. 2 materials.
The strength is guaranteed for material by material standards while the
purpose of the PQR is to see that the strength of the joint is not
adversely affected and hence the acceptance criterion for Tensile Test is
accordingly (Refer QW-153.1).
Hope to have clarified,
Best regards,
Prasad
Sukamal Naskar
<sukamalbecmet@gm
ail.com> To
Sent by: materials-welding@googlegroups.com
materials-welding cc
@googlegroups.com
Subject
[MW:1634] Re: Minimum strength
25/02/09 03:43 PM requirement of procedure.
Please respond to
materials-welding
@googlegroups.com
Dear Friend,
I expect that the value you mentioned 62 KSI is the tensile strength, which
you have found during your PQR qalification. As you have welded with SA 516
Gr. 60 with Gr. 70 material,if during tensile testing, the tensile specimen
start necking on the base material ( SA 516 Gr.60 ) side, not on the weld
metal, then you can use a WPS supporting this PQR for the welding of SA516
Gr.70 to SA516Gr.70, unless other parameters used on the PQR are same.
It is ofcourse that you are using , one base material having min TS 60Ksi,
another one min 70 Ksi and also the used welding consumable TS min 70Ksi,
hence during the tensile testing , the sample will form neck from the
weaker region.
Regards,
On Wed, Feb 25, 2009 at 7:14 PM, Muhammed Ibrahim <ibratech@gmail.com>
wrote:
Hi friends,
I need clarification on one important thing regarding PQR.
PQR is qualified with SA516Gr.60 ( P1 Gr.1) to SA516Gr.70( P1 Gr.2) wth
E7018-1 Electrode and it passes at 62 KSI strength.
Can it be used for SA516Gr.70 to SA516Gr.70 production weld based on the
above results?.
As the production material require 70 KSI strength, how this procedure
will support for SA516Gr.70 to SA516Gr.70welding
Thanks & Regards
Muhammed Ibrahim PK
--
Sukamal Naskar
Malaysia
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