Thursday, February 10, 2011

Re: [MW:9801] Backing by gas/Back purging is not essential for P.No 8 - Austentic stainless steel? - ASME Sec 9

Dear All,
 
BY Asme sec 9, QW 408.9 & .10, does n't applies to P No.8, Austentis SS
So.. he may be right. I think we can.
 
 
Regards

On Thu, Feb 10, 2011 at 11:34 AM, Zakaria ghrab <zakaria.ghrab@gmail.com> wrote:
Dear Sir,

As i know & as per QW 256 & QW408.9 ,  only deletion and chnage in backing gas composition is essentiel variable, so we can qualify WPS without backing but we will have sure problem in penetration. The best is to do one PQR with backing gas and use it to qualify all your WPS's in production.


Regards.

  

2011/2/10 Srinivas Engr <srinivas.gmsrini@gmail.com>

Dear All,

As per QW 256, GTAW process,
QW 408 Gas, There is no essential variable for gas Backing for P.No.
-8. Austentic Stainless Steel. A312 & others.
So we can qualify WPS without gas backing/Bsckpurging.
Am i right or not?
Pl clear me

Regards
Srinivas

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GHRAB Zakaria

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