Method for bonding metals

Claim 1

A PROCESS FOR BONDING TOGETHER AT LEAST TWO STRIPS OF ESSENTIALLY FLAT METAL CAPABLE OF BEING JOINED BY SOLID PHASE DIFFUSION AND CAPABLE OF BEING TENSIONED, WHICH COMPRISES THE STEPS OF SUPERPOSING THE METALLIC STRIPS AND WINDING THEM ONTO A CORE UNDER SUFFICIENT TENSION TO BRING THE CONTACTING SURFACES OF THE STRIPS INTO ALL OVER INTIMATE CONTACT, THEREBY FORMING A TENSIONED COIL THE CONVULUTIONS OF WHICH ARE EACH COMPOSED OF SAID SUPERPOSED METALLIC STRIPS, INCLUDING THE STEP OF INTERPOSING A STOP-OFF MATERIAL BETWEEN THE CONVULUTLTIONS OF THE COIL, SECURING THE COIL IN THE TENSIONED CONDICION, AND THEREAFTER HEATING THE TENSIONED COIL UNDER NON-OXIDIZING CONDITIONS AND AT A TEMPERATURE WHICH IS ABOVE THE RECRYSTALLIZATION TEMPERATURE OF AT LEAST ONE OF THE MTEALLIC STRIPS IN THE COIL BUT BELOW THE MELTING POINT OF THE METALLIC STRIP IN THE COIL HAVING THE LOWEST MELTING POINT, SAID COIL BEING MAINTAINED AT TEMPERATURE FOR A TIME SUFFICIENT TO EFFECT SOLID PHASE BONDING BETWEEN THE SUPERPOSED STRIPS, SAID LENGTH OF TIME BEING ON THE ORDER OF FROM ABOUT ONE TO TWENTY-FOUR HOURS DEPENDING UPON THE TEMPERATURE AT WHICH THE COIL IS TREATED, THE TIME AT TEMPERATURE VARYING INVERSELY WITH THE TEMPERATURE, AND THEREAFTER COOLING SAID COIL.