I'm searching the method to braze Al Alloys to stainless steel in the air. On the web, several manufacturere offers the brazing solutions in the vacuum furnace or the inert gas atmosphere. But, for the brazing in the air, no documents were found as far as I searched.

I tried to braze several Al alloys to the stainless steel with Al-Si brazing filler using the flux. But I could not obtained the enough strength of joint.