Hi!
From qualty point of view, the gas backing /purging for groove welding of SS is essential . Failure to backing will cause Oxidation of weld which is not acceptable
Regards
Hegde P.B.
From: Zakaria ghrab <zakaria.ghrab@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thu, 10 February, 2011 1:04:39 PM
Subject: Re: [MW:9799] Backing by gas/Back purging is not essential for P.No 8 - Austentic stainless steel? - ASME Sec 9
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.
--
GHRAB Zakaria
-- 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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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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