... impede joint inspection, and prevent further surface finishing operations. Phosphorus-containing brazing alloys can be self-fluxing when joining copper ... metal and the filler metal being used. Self-fluxing phosphorus filler alloys produce brittle phosphides if used on iron or ... alloySilverAmorphous brazing foil using nickel, iron, copper, silicon, boron, phosphorus, etc. Welding Tips: What Is Brazing?