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[MW:13349] Oxygen level in purging gas during welding of duplex stainless steel

By Materials & Welding
Hi friends,
 
I have 2 different specification which the requirements are different for the oxygen level in purging gas during the welding of super duplex pipe.
 
One of them calls for 25 ppm (0.0025%) another one calls for 5000 ppm (0.5%). Could you please shed some light on this as which one is up to the standard with references?
 
Thanks,
Martin.

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