Sunday, July 31, 2011

Re: [MW:12013] gas purging

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
ABDUL JABBAR KHAN

--- On Fri, 29/7/11, Prasu Cutie <pracuty@gmail.com> 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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