Method of bonding sheets of metal

Claim 1

THE METHOD OF BONDING A STEEL HONEYCOMB MEMBER BETWEEN STEEL BACKINGS COMPRISING THE STEPS OF CLEANING THE MEMBERS TO BE BONDED BY VAPOR DEGREASING WITH A CHLOROHYDROCARBON AND FURTHER CLEANING THE MEMBERS WITH AN ALKALINE CLEANER, GRINDING A FRIT COMPOSED OF BORIC ACID, SODIUM NITRATE AND POWDERED QUARTZ TO A MINUS 200 MESH SIZE, AND BORIC ACID AND SAID SODIUM NITRATE BEING PRESENT IN AN AMOUNT SUFFICIENT TO PERMIT BONDING TO THE MEMBERS, GRINDING A BRAZING ALLOY CONSISTING OF SILICON, BORON, CARBON NICKEL TO A MINUS 325 MESH SIZE, MIXING THE RESULTING GROUND FRIT WITH THE GROUND BRAZING ALLOY IN THE RATIO OF 3.5:1 TO 4.5:1 OF SAID BRAZING ALLOY TO FRIT BY WEIGHT, MAKING A SLURRY OF THE RESULTING MIXTURE AND A BRAZING ALLOY CEMENT, COATING THE CONTACTING FACES OF THE MEMBERS WITH THE RESULTING SLURRY, PLACING THE MEMBERS INTO CONTACT UNDER A PRESSURE OF FROM ONE TO THREE ATMOSPHERES, AND FIRING THE STRUCTURE AT 1900 TO 2100 DEGREES F. IN AIR FOR 5 TO 15 MINUTES.

Claim 2

THE METHOD OF BONDING A STEEL HONEYCOMB MEMBER BETWEEN STEEL BACKINGS COMPRISING THE STEPS OF CLEANING THE MEMBERS TO BE BONDED BY VAPOR DEGREASING WITH A CHLOROHYDROCARBON AND FURTHER CLEANING THE MEMBERS WITH AN ALKALINE CLEANER, GRINDING A FRIT COMPOSED OF BORIC ACID, SODIUM NITRATE AND POWDERED QUARTZ TO A MINUS 200 MESH SIZE, AND BORIC ACID AND SAID SODIUM NITRATE BEING PRESENT IN AN AMOUNT SUFFICIENT TO PERMIT BONDING TO THE MEMBERS, GRINDING A BRAZING ALLOY CONSISTING OF SILICON, BORON, CARBON NICKEL TO A MINUS 325 MESH SIZE, MIXING THE RESULTING GROUND FRIT WITH THE GROUND BRAZING ALLOY IN THE RATIO OF 3.5:1 TO 4.5:1 OF SAID BRAZING ALLOY TO FRIT BY WEIGHT, MAKING A SLURRY OF THE RESULTING MIXTURE AND A BRAZING ALLOY CEMENT, COATING THE CONTACTING FACES OF THE MEMBERS WITH THE RESULTING SLURRY, PLACING THE MEMBERS INTO CONTACT UNDER A PRESSURE OF FROM ONE TO THREE ATMOSPHERES, AND FIRING THE STRUCTURE AT 1900 TO 2100 DEGREES F. IN AIR FOR 5 TO 15 MINUTES.

Claim 3

THE METHOD OF BONDING TWO METALLIC MEMBERS TOGETHER COMPRISING THE STEPS OF, CLEANING THE MEMBERS TO BE BONDED, GRINDING A FRIT AND BRAZING ALLOY TO A RELATIVELY SMALL SIZE, SAID FRIT INCLUDING AN ALKALINE BOROSILICATE IN AN AMOUNT TO PERMIT BONDING TO THE MEMBERS, SAID BRAZING ALLOY HAVING A MAJOR INGREDIENT SELECTED FROM A GROUP CONSISTING OF NOBLE METALS AND NICKEL AND HAVING A MINOR INGREDIENT CAPABLE OF WETTING AND BONDING TO SAID GROUND FRIT, MIXING THE GROUND FRIT AND THE GROUND BRAZING ALLOY TOGETHER, PLACING THE MIXED POWDERS IN A LIQUID CARRIER, COATING AT LEAST ONE OF THE CONTACTING FACES OF HE MEMBERS WITH THE MIXTURE, PLACING THEM INTO CONTACT AND FIRING THE STRUCTURE IN AIR AT A TEMPERATURE OF 1600 TO 2100 DEGREES F. FOR A SUFFICIENT TIME TO MATURE THE FRIT AND BARAZING MATERIALS.

Claim 4

THE METHOD OF BONDING TWO METALLIC MEMBERS TOGETHER COMPRISING THE STEPS OF, CLEANING THE MEMBERS TO BE BONDED, GRINDING A FRIT AND BRAZING ALLOY TO A RELATIVELY SMALL SIZE, SAID FRIT INCLUDING AN ALKALINE BOROSILICATE IN AN AMOUNT TO PERMIT BONDING TO THE MEMBERS, SAID BRAZING ALLOY HAVING A MAJOR INGREDIENT SELECTED FROM A GROUP CONSISTING OF NOBLE METALS AND NICKEL AND HAVING A MINOR INGREDIENT CAPABLE OF WETTING AND BONDING TO SAID GROUND FRIT, MIXING THE GROUND FRIT AND THE GROUND BRAZING ALLOY TOGETHER, PLACING THE MIXED POWDERS IN A LIQUID CARRIER, COATING AT LEAST ONE OF THE CONTACTING FACES OF HE MEMBERS WITH THE MIXTURE, PLACING THEM INTO CONTACT AND FIRING THE STRUCTURE IN AIR AT A TEMPERATURE OF 1600 TO 2100 DEGREES F. FOR A SUFFICIENT TIME TO MATURE THE FRIT AND BARAZING MATERIALS.