It depends on the corrosive media and service temperature and whether or not you carry out pickling and/or passivation after welding.
More critical the application (like Critical pharmaceutical piping systems) and More severe the service conditions, go for lower Oxygen concentrations...
More effective the pickling and/or passivation procedure, you can allow higher Oxygen concentrations...
Regards
Ramin Kondori 
QC/Welding Engineer
IWE AT 0070
On Mon, Aug 1, 2011 at 5:55 PM, sudhakar kuppuswamy <mechsudhakar@gmail.com> wrote:
On Sun, Jul 31, 2011 at 9:11 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
Gas purging is not required for SMAW /FCAW process, that is it is depend on process alsobare wire welding process like TIG/PAW/GMAW, purging is requiredPandithanCethar LtdTrichy
Dear Pandithan,Your talking about sheilding gas not purging gas!! Its possible to weld a SS with out puring????On Sun, Jul 31, 2011 at 8:39 PM, antony jenis <antonyjenis@gmail.com> wrote:
--Dear all,can anybody tell while S.S& CU-NI ALLOYS welding GTAW process purging need to check oxygen percentage is required.the asme B31.3 & ASME section IX says anything about how much allowable percentage of oxygen content .tour valluable inputs highly appreciated.RegardsANTONYOn Sun, Jul 31, 2011 at 9:11 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
Gas purging is not required for SMAW /FCAW process, that is it is depend on process alsobare wire welding process like TIG/PAW/GMAW, purging is requiredPandithanCethar LtdTrichyOn Sat, Jul 30, 2011 at 7:29 AM, sudhakar kuppuswamy <mechsudhakar@gmail.com> wrote:
Gas Purging is done to avoid oxidation during welding. Gas purging is Mandatory to all material which responds to oxidation during welding irrespective of process.. generally when the Cr content exceeds more that 2.5 % in overall composition of a particular material inert gas purging should be done before welding.... I don't think by using MIG process we can avoid puring!!!Mr Prasad can I know for what material your talking about???regardssudhakar.k
--n Fri, Jul 29, 2011 at 8:41 PM, abdul khan <abdul_khan2010@yahoo.co.in> wrote:
From: Prasu Cutie <pracuty@gmail.com>
Subject: [MW:11977] gas purging
To: materials-welding@googlegroups.com
Date: Friday, 29 July, 2011, 5:01 PM
Why gas purging is not mandatory for MIG welding as it is mostly used for TIG welding?
In MIG welding i found contamination is very lass as compared to TIG welding without purging.
Can any one clarify me??????
Regards
Prasad
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With regards,
Sudhakar.k--
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With regards,
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