Peterson Fluxes blue flux is a powder based substance that is generally used for brazing cast and malleable iron or steel. In other words it will create a strong bond between alloys during the welding process. It can be used to clean or bond dirty, rusty and burnt casting plus eliminate all oxides by bringing them to the surface. This substance can also be applied during the torch welding of brass, bronze, and copper.
Blue flux from Peterson Fluxes is designed for brazing and creating a strong bond between alloys.