Copper-Zinic Brazing Alloys Copper-Zinic Brazing Alloys are suitable for gas-flame brazing, high temperature brazing, salt bath dip brazing between copper and copper alloys, nickel, cast iron and hard alloys. While in oxyacetylene brazing, it is possible to prevent Zinc evaporation by oxidization flame heating. . The optimum joint gap should be 0.025-0.01mm. And flux is also necessary