Method of removing atmosphere and then pressure welding

Claim 1

A METHOD OF REMOVING AND EXCLUDING ATMOSPHERES FROM BETWEEN ADJACENT SURFACES OF COMPONENTS OF A BIMETALLIC BILLET FOR SUBSEQUENT UNIFICATION BY PRESSURE WELDING COMPRISING, FORMING IN AT LEAST ONE OF A PAIR OF OPPOSED FACES OF A BASE COMPONENT OF A FIRST METAL A DEPRESSION DISPOSED BETWEEN FLANGES PROJECTING FROM OPPOSED LATERAL EDGES OF SAID BASE COMPONENT; FORMING AN ASSEMBLY BY INSERTING IN SAID DEPRESSION A CLADDING COMPONENT OF A SECOND METAL DIFFERENT THAN SAID FIRST METAL AND HAVING A THICKNESS GREATER THAN THE HEIGHT OF SAID FLANGES, SAID DEPRESSION BEING FORMED IN SAID BASE COMPONENT TO PROVIDE SAID FLANGES OF A THICKNESS AND HEIGHT OFFERING LESS RESISTANCE TO PLASTIC DEFORMATION THAN SAID CLADDING COMPONENT WHEN SAID ASSEMBLY IS SUBJECTED TO THE BELOW DESCRIBED REDUCTION IN THICKNESS BY COLD ROLLING WITH SAID HEIGHT OF SAID FLANGES BEING RESTRICTED IN DIMENSION SO THAT AFTER SAID COLD ROLLING THE TOP OF SAID FLANGES REMAIN BELOW THE TOP OF SAID CLADDING COMPONENT, THE OUTER EDGES OF SAID CLADDING COMPONENT BEING ADJACENT THE INNER EDGES OF SAID FLANGES; PLASTICALLY DEFORMING SAID COMPONENTS BY SUBJECTING SAID ASSEMBLY TO A REDUCTION IN THICKNESS BY SAID COLD ROLLING WITH SAID DEFORMING BEING SUFFICIENT TO PRESS SAID COMPONENTS INTO INTIMATE ENGAGEMENT WITH EACH OTHER IN THEIR ADJACENT AREAS WITH SUFFICIENT FORCE TO SQUEEZE OUT ALL ATMOSPHERES AND TO FOMR A SEAL BETWEEN THE OUTER EDGES OF SAID C LADDING COMPONENT AND THE INNER EDGES OF SAID FLANGES; AND SUBSEQUENTLY HEATING AND ROLLING TO PRESSURE WELD SAID COMPONENTS TOGETHER.

Claim 2

A METHOD OF REMOVING AND EXCLUDING ATMOSPHERES FROM BETWEEN ADJACENT SURFACES OF COMPONENTS OF A BIMETALLIC BILLET FOR SUBSEQUENT UNIFICATION BY PRESSURE WELDING COMPRISING, FORMING IN AT LEAST ONE OF A PAIR OF OPPOSED FACES OF A BASE COMPONENT OF A FIRST METAL A DEPRESSION DISPOSED BETWEEN FLANGES PROJECTING FROM OPPOSED LATERAL EDGES OF SAID BASE COMPONENT; FORMING AN ASSEMBLY BY INSERTING IN SAID DEPRESSION A CLADDING COMPONENT OF A SECOND METAL DIFFERENT THAN SAID FIRST METAL AND HAVING A THICKNESS GREATER THAN THE HEIGHT OF SAID FLANGES, SAID DEPRESSION BEING FORMED IN SAID BASE COMPONENT TO PROVIDE SAID FLANGES OF A THICKNESS AND HEIGHT OFFERING LESS RESISTANCE TO PLASTIC DEFORMATION THAN SAID CLADDING COMPONENT WHEN SAID ASSEMBLY IS SUBJECTED TO THE BELOW DESCRIBED REDUCTION IN THICKNESS BY COLD ROLLING WITH SAID HEIGHT OF SAID FLANGES BEING RESTRICTED IN DIMENSION SO THAT AFTER SAID COLD ROLLING THE TOP OF SAID FLANGES REMAIN BELOW THE TOP OF SAID CLADDING COMPONENT, THE OUTER EDGES OF SAID CLADDING COMPONENT BEING ADJACENT THE INNER EDGES OF SAID FLANGES; PLASTICALLY DEFORMING SAID COMPONENTS BY SUBJECTING SAID ASSEMBLY TO A REDUCTION IN THICKNESS BY SAID COLD ROLLING WITH SAID DEFORMING BEING SUFFICIENT TO PRESS SAID COMPONENTS INTO INTIMATE ENGAGEMENT WITH EACH OTHER IN THEIR ADJACENT AREAS WITH SUFFICIENT FORCE TO SQUEEZE OUT ALL ATMOSPHERES AND TO FOMR A SEAL BETWEEN THE OUTER EDGES OF SAID C LADDING COMPONENT AND THE INNER EDGES OF SAID FLANGES; AND SUBSEQUENTLY HEATING AND ROLLING TO PRESSURE WELD SAID COMPONENTS TOGETHER.