[MW:25644] To check argon quality on field/site.

Dear sir,

We have stainless steel welding on site.
I want to know that is there any trick to check argon quality and secondly to check argon cylrnder,with litmus paper and like that( as I have doubt that contractor is using nitrogen cylinder, as per specification, we want argon only, may be nitrogen is allowed).

Pls provide any solution.


Regards
Prasad

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