Re: [MW:22311] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

When subjected to high temperatures and atmospheric oxygen, many metals tend to intense oxidation. The oxides generally appear as temper color, for example, with stainless steel or titanium materials. Temper  colors will greatly impair the corrosion resistance of such metals. Furthermore, severe oxidation will impair the formation of weld roots. Thus, in many cases, the root side has to be protected against oxygen in order to ensure optimum corrosion resistance.

For duplex and superduplex steels, using root-shielding gases that contain nitrogen or pure nitrogen improves corrosion resistance.






Rui Fernandes Pinho
Divisão de Gases Industriais
Desenvolvimento de Aplicação de Gases

Linde Portugal, Lda.
Travessa Joaquim Dias Salgueiro, Nº 44
4470-416 Vila Nova da Telha, Portugal
Phone + 351 22 999 8380, Fax: + 351 22 996 4039
Mobile + 351 91 473 9197
rui.pinho@pt.linde-gas.com, www.linde.pt



From:        Murugesan Jeyaraman <jmurugesan@gmail.com>
To:        "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date:        17-11-2014 03:56
Subject:        [MW:22274] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels
Sent by:        materials-welding@googlegroups.com

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Dear All 

Which gas is better for purging gas of super duplex stainless steel welds. 

Please compare both technically, also suggest which is best to use in Duplex SS purging?  Is there any difference at all or both just gives equal result?

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Thanks and Regards
 
Murugesan 

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