Aluminum casting process

Claim 1

THE PROCESS OF PRODUCING A DUPLEX METAL STRUCTURE COMPRISING A CYLINDRICAL HEAT HARDENED FERROUS METAL BODY AND A SUPPORTING CAST ALUMINUM BODY HAVING AN ALLOY BOND THEREWITH, COMPRISING IMMERSING SAID FERROUS 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OF CRYOLITE AND CHLORIDES, MAINTAINING SAID BODY IN SAID BATH FOR A TIME INTERVAL SUFFICIENT TO PROVIDE SAID BODY WHEN WITHDRAWN THEREFROM WITH A CONTINUOUS LAYER OF SAID FLUENT FLUX ON THE PORTION OF SAID FERROUS BODY WHERE IT IS TO BE BONDED WITH SAID ALUMINUM, WITHDRAWING SAID FERROUS BODY FROM THE FLUX BATH, POSITIONING THE FLUX LAYERED FERROUS BODY IN A MOLD PROVIDING A CAVITY ADJACENT SAID FERROUS BODY SHAPED TO FORM SAID ALUMINUM BODY, POURING MOLTEN ALUMINUM AT A TEMPERATURE BETWEEN 1325*F. AND 1425*F. INTO SAID CAVITY WHILE SAID FLUX OF SAID FLUX LAYER IS STILL FLUENT, TO FORM SAID ALUMINUM BODY, SAID MOLTEN ALUMINUM DISPLACING SAID FLUENT FLUX AHEAD OF IT IN THE CAVITY AND FORMING WHEN SET A FERRO ALUMINUM ALLOY BOND WITH SAILD FERROUS BODY, DIRECTING A RING OF AIR WATER VAPOR AGAINST THE SURFACE OF SAID FERROUS BODY OPPOSITE THE POURED ALUMINUM DURING POURING THEREOF AND MOVING SAID RING OF VAPOR THROUGH THE AREA OF CONTACT OF SAID MOLTEN ALUMINUM AND SUBSTANTIALLY IN STEP WITH SAID POURING.