Method of joining ferrous metal parts

Claim 1

IN A METHOD FOR BRAZING STEEL PARTS CONTAINING ABOUT 1% BY WEIGHT CARBON OR LESS THE STEPS COMPRISING DISPERSING A MIXTURE OF GRAPHITE AND IRON POWDERS CONSISTING OF 4.3% TO ABOUT 15% BY WEIGHT CARBON AND THE BALANCE SUBSTANTIALLY IRON IN A LIQUID VEHICLE TO FORM A BRAZING MATERIAL OF PASTE-LIKE CONSISTENCY, APPLYING A LAYER OF SAID BRAZING MATERIAL BETWEEN THE STEEL PARTS TO BE JOINED, HEATING SAID BRAZING MATERIAL AND THE ADJACENT STEEL PARTS TO A TEMPERATURE IN A RANGE OF ABOUT 2150*F. AND 2250*F FOR A TIME SUFFICIENT TO CAUSE SAID CARBON TO DIFFUSE INTO SAID IRON OF SAID MATERIAL AND FORM A MOLTEN EUTECTIC ALLOY AND TO CAUSE CARBON FROM SAID MATERIAL TO LIKEWISE DIFFUSE INTO THE ADJACENT STEEL PARTS AND FORM A SURFACE EUTECTIC ALLOY THEREON AND ON FURTHER HEATING TO CAUSE FURTHER DIFFUSION OF THE CARBON INTO THE ADJACENT STEEL PARTS THEREBY REDUCING THE CARBON CONTENT OF SAID ALLOY BELOW EUTECTIC PROPORTIONS WHEREBY THE MELTING POINT OF THE ALLOY IS CAUSED TO RISE AND THE MOLTEN METAL IS CAUSED TO SOLIDIFY.