Braze bonding of concentric tubes and shells and the like

Claim 1

IN A METHOD OF BRAZING A METAL MEMBER OF GENERALLY TUBULAR CONTOUR TO ANOTHER METAL MEMBER OF MATING TUBULAR SHAPE, THE STEPS WHICH COMPRISE PLACING THE TWO TUBULAR MEMBERS IN CONCENTRIC NESTING RELATIONHSIP WITH A THIN LAYER OF BRAZING MATERIAL DISPOSED BETWEEN THE INNER MEMBER AND THE OUTER MEMBER, THERE BEING A SPACE BETWEEN THE TWO METAL MEMBERS SO ASSEMBLED, MECHANICALLY DEFORMING ONE OF SAID TWO NESTED MEMBERS RADIALLY TOWARDS AND AGAINST THE OTHER WITH RESULTANT EXERTION UPON THE SAID BRAZING MATERIAL LAYER THEREBETWEEN OF AN INTENSE COMPRESSIVE FORCE WHICH EFFECTS INTIMATE CONTACT THROUGHOUT THE JOINT SURFACE AREA WITH AN ACCOMPANYING EXCLUSION OF AIR FROM SUCH AREA, SEALING THE THUS COMPRESSED LAYER OF BRAZING MATERIAL AGAINST BOTH MATERIAL OUTFLOW AND AIR INFLOW UPON LATER MELTING, HEATING THE ASSEMBLAGE OF THESE THUS CONTACTED AND SEALED PARTS OF A TEMPERATURE SUFFICIENT TO MELT THE SAID LAYER OF BRAZING MATERIAL WHILE MAINTAINING THAT LAYER UNDER THE AFORESAID INTENSE COMPRESSION BETWEEN THE NESTED TUBULAR MEMBERS, AND COOLING SAID ASSEMBLAGE TO BELOW THE MELTING RANGE OF SAID HEATED AND COMPRESSED BRAZING MATERIAL WITH AN ACCOMPANYING SOLIDIFICATION OF THAT MATERIAL INTO A BOND WHICH INTEGRALL AND CONTINUOUSLY JOINS THE SAID TWO NESTED MEMBERS TOGETHER THROUGHOUT THE AREA OF THEIR CONTACTING SURFACES, ALL OF THE FOREGOING BEING DONE WITHOUT THE AID OF FLUXING AGENT OR OF A PROTECTIVE ATMOSPHERE OR OF A VACUUM.