[MW:2963] Re: nitrogen

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:

Hi,

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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