Thursday, February 28, 2013

RE: [MW:16895] CO2 purging during TIG welding of CS service line

 Mr. Hrishikeshan,
 
CO2 purging to flush oil and other gases needs to be done prior to welding. Following flushing area needs be inspected to ensure that oil and and other  gases are properly removed.
 
As the weld is a socket weld , CO2 purging could be maintained but at very reduced pressure. CO2  "purge"should  not interfere with "Argon"  shielding gas used for GTAW and causes porosity.
 
If the weld is critical, then the advise is to do a mock up prior to welding.
 
Thanks.
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vino Varghese
Sent: Wednesday, February 27, 2013 10:34 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:16892] CO2 purging during TIG welding of CS service line

Dear Sir,

What does your WPS states?

Regards, Vino

On Thu, Feb 28, 2013 at 5:52 AM, K.M Hrishikesan <hrishikm07@gmail.com> wrote:
Our safety team recommends CO2 purging during repair welding of a 2" socket weld joint of a CS  line( consumable-  ER 70S-2 process GTAW). Traces of oil and  toxic gases  have already been removed from the loop by  flushing and CO2 purging. Still, as a precautionary measure, CO2 puging is being recommended during welding also 
 
Does it have any impact on the weld quality?
 
Thanks

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