N is an element which can help/ influence the relation between auteniet an ferriet, very important with duplex. If N absorbed/lost during welding of root the shielding gas can compensate...
For a project in Holland we tested (G48) some welds with Ar+N which turned out rather positive compared to 99,995% Ar.
greets,
Arjan van Vessum
Date: Tue, 18 Aug 2009 16:40:33 +0400
Subject: [MW:2963] Re: nitrogen
From: smmubarakqc@gmail.com
To: materials-welding@googlegroups.com
Dear Mr.Kannan,
TIG welding is usually performed with pure argon as
The shielding gas.
But, Resistance to pitting
Corrosion can be considerably raised by the addition of
Up to 2% nitrogen. However, because the risk of pores
Increases with increased nitrogen %
Thanks & Regards,
S.Mubarak.
On 8/18/09, rajagopal kannan <rajagopal.kannan@gmail.com> wrote:
<brHi,I could see in a client spec. insisting the use of 98% Ar and 2% Nitrogen gas mixture for backing and shielding of duplex steel welding.What could be the significance of using 2% Nitrogen?How it is technically advantageous over use of single argon gas?Thanks and Regards,K.RAJAGOPAL
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