Nitrogen for Brazing has an irreplaceable function. Copper and oxygen react creating “oxide” or copper oxide, similar to how iron and oxygen react to create rust. When we heat copper over about 500°, this begins to occur rapidly. As heat and oxygen increase, you’ll see more copper oxide scale building up. Nitrogen prevents the build-up of oxide and the connection is also improved with a much cleaner and stronger edge. More about the industry here.