Method of simultaneously deforming two overlapping tubular metal elements to form interlocking ridges

Claim 1

THE METHOD OF SIMULTANEOUSLY EXPLOSIVELY DEFORMING A PAIR OF OVERLAPPING CYLINDRICAL PORTIONS OF TUBULAR METAL ELEMENTS POSITIONED WITHIN AN ENCIRCLING TIGHTLY FITTING METAL RING, HAVING AN INTERNAL SURFACE THE CONTOUR OF WHICH DEPARTS FROM A CYLINDRICAL SURFACE, WHEREBY SAID LAYERS ARE SIMULTANEOUSLY DRIVEN BY EXPLOSIVE SHOCK FORCE INSIDE THE INNER ELEMENT INTO INTIMATE CONTACT WITH EACH OTHER AND WITH THE INTERNAL SURFACE OF SAID RING AND DEFROMED INTO THE CONTOUR OF SAID SURFACE, THUS FORMING AT LEAST ONE INTERLOCKING RIDGE AND DEPRESSION IN THE MATING SURFACES OF SAID ELEMENTS, COMPRISING, INSERTING ONE END OF THE SMALLER TUBULAR ELEMENT INTO ONE ONE OF THE LARGER TUBULAR ELEMENT TO FORM AN OVERLAP SECTION, POSITIONING SAID METAL RING ABOUT SAID LARGER TUBULAR ELEMENT WITHIN THE OVERLAP SECTION, INSERTING INTO THE SMALLER ELEMENT WITHIN THE OVERLAP SECTION AN EXPLOSIVE ASSEMBLY CAPABLE OF EXERTING ON THE INNER SURFACE OF THE SMALLER ELEMENT AN EXPLOSIVE DETONATION SHOCK FORCE THAT IS SUFFICIENT TO SIMULTANEOUSLY BULGE SAID OVERLAPPING CYLINDRICAL PORTIONS TO FORM AT LEAST ONE INTERLOCKING RIDGE AND DEPRESSION, AND DETONATING SAID EXPLOSIVE ASSEMBLY TO BULGE SAID PORTIONS TO FORM AT LEAST ONE INTERLOCKING RIDGE AND DEPRESSION IN SAID MATING SURFACES.