Method of casting aluminum on ferrous base to form duplex structure

Claim 1

THE PROCESS OF PRODUCING A DUPLEX METAL STRUCTURE COMPRISING A FERROUS METAL BODY AND A FACING OF CAST ALUMINUM HAVING AN ALLOY BOND THEREWITH COMPRISING IMMERSING SAID BODY IN A BATH OF FLUENT MOLTEN FLUX HAVING A TEMPERATURE BETWEEN 1250*F. AND 1450*F., AND CONSISTING ESSENTIALLY OF CRYOLITE AND CHLORIDES, MAINTAINING SAID BODY IN SAID BATH FOR A TIME INTERVAL SUFFICIENT TO PROVIDE SAID BODY WHEN WITHDRAWN THEREFROM WITH A CONTINUOUS LAYER OF SAID FLUX ON THE PORTION OF THE BODY WHERE IT IS TO BE ALUMINUM FACED, SAID BODY WHEN WITHDRAWN BEING IN A HEATED CONDITION AND SAID FLUX THEREON BEING FLUENT, WITHDRAWING SAID BODY FROM THE FLUX BATH AND POSITIONING THE FLUX LAYERED BODY IN A MOLD PROVIDING A CAVITY ADJACENT SAID BODY SHAPED TO FORM SAID FACING AND WHILE SAID FLUX OF SAIDFLUX LAYER IS STILL FLUENT POURING MOLTEN ALUMINUM AT A TEMPERATURE BETWEEN 1325*F. AND 1425*F. INTO SAID CAVITY TO FORM SAID FACING, SAID MOLTEN ALUMINUM DISPLACING SAID FLUENT FLUX AHEAD OF IT IN THE CAVITY AND FORMING WHEN SET A FERRO-ALUMINUM ALLOY BOND WITH SAID BODY.