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RE: [MW:22326] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

By Materials & Welding
Hi Nassef,
 
Please see the attachment for additional guidance.A change of backing gas is an essential variable for procedure qualification on DSS/SDSSs(QW-408).
 
Both Ar,or Ar+ N2 or N2+H2(formier gas) are well proven as  backing gas while welding these steels. Presence of Nitrogen containing backing gases are advisable to protect the root from unfavorable austenite/ferrite ratio.This is critical if there's a requirement of ASTM G-48A pitting corrosion test (typically 25 Deg C  for DSS and  35 DegC and above  for SDSS).
 
In absence of the above pitting corrosion tests  pure (100%) Argon may also be used for backing.
 
Thanks.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
http://ca.linkedin.com/pub/pradip-goswami/5/985/299
 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Naasief Navsa
Sent: Thursday, November 20, 2014 4:33 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:22307] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

Hi Ahmed,

 

Thank you (Shukran) for the valuable information. One more question, this mix of argon and nitrogen, what ratio’s would be optimum.

 

We are Tig welding material that is 0.15mm thick. We typically weld with about 18A, and a linear speed of 50mm/sec. At this point in time we are purging with 100% Argon.

 

Regards,

 

Naasief

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ahmad el-sharkawy
Sent: 20 November 2014 09:21 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:22304] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

 



On Wed, Nov 19, 2014 at 11:13 PM, Ahmad el-sharkawy <ahmad.sharkawy88@gmail.com> wrote:

dear Noe Mota mixture of argon and nitrogen is the best gas purging for welding duplex and super duplex stainless steel


 

 







On Wed, Nov 19, 2014 at 10:34 PM, Ahmad el-sharkawy <ahmad.sharkawy88@gmail.com> wrote:

dear Naasief Navsa use mix of argon and nitrogen and use low heat input.

 




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AHMED ELSHARKAWY
QA/QC ENGINEER
DIPLOMA DEGREE IN WELDING ENGINEERING.
CERTIFIED WELDING INSPECTOR " CWI " 14072901.
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WITH MY BEST WISHES

AHMED ELSHARKAWY
QA/QC ENGINEER
DIPLOMA DEGREE IN WELDING ENGINEERING.
CERTIFIED WELDING INSPECTOR " CWI " 14072901.
ASNT LEVEL II " RT&VT&UT&PT&MT"
IRECA CERTIFIED LEAD EDITOR ISO 9001/2008.

PREPARING MASTER DEGREE IN WELDING ENGINEERING.

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