Call me ignorant, but why would you want to? I guess I would be interested to know what the other variables are here that would require the conditions that you are asking about. Regards, aevald

How is that possible? The atmosphere where the brazing is taking place is defined by the flame. It would be so even if the surrounding atmosphere were argon although that would certainly have an effect on the flame. In that case the products of combustion would quickly pollute the argon.
Bill