Tuesday, August 18, 2009

[MW:2959] nitrogen

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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