Dear ANTONY, For gas purging, The oxygen Level in Alloy steel should not be more than 1%. The Oxygen Level in S.Steel should not be more than 0.05% Hope the answer to your Question . Regards ABDUL JABBAR KHAN
--- On Tue, 2/8/11, Ramin Kondori <raminkondori@gmail.com> wrote:
From: Ramin Kondori <raminkondori@gmail.com>
Subject: Re: [MW:12051] gas purging
To: materials-welding@googlegroups.com
Date: Tuesday, 2 August, 2011, 6:01 AM
Some specifications specify 8-10 ppm as the upper limit for oxygen in purge gas but we have proceeded with 20 ppm in a project where inconnel cladding pipes (gas platform sour gas main flow lines) were to be welded and results were satisfactory. 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 also bare wire welding process like TIG/PAW/GMAW, purging is required Pandithan Cethar Ltd Trichy
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. Regards ANTONY
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 also bare wire welding process like TIG/PAW/GMAW, purging is required Pandithan Cethar Ltd Trichy
On 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???
regards sudhakar.k
n Fri, Jul 29, 2011 at 8:41 PM, abdul khan <abdul_khan2010@yahoo.co.in> wrote: | Dear Prasad
Gas purging is done only on P number 5 and above base metal , purging is not based on welding process or type. I hope the answer to your question. Regards
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 -- To post to this group, send email to materials-welding@googlegroups.comTo unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.comFor more options, visit this group's bolg at http://materials-welding.blogspot.com/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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With regards,
Sudhakar.k
-- To post to this group, send email to materials-welding@googlegroups.comTo unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.comFor more options, visit this group's bolg at http://materials-welding.blogspot.com/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. --
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-- With regards, Sudhakar.k -- To post to this group, send email to materials-welding@googlegroups.comTo unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.comFor more options, visit this group's bolg at http://materials-welding.blogspot.com/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. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/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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