Method of making a tubular joint

Claim 1

THE PROCESS OF MAKING A JOINT CONNECTING A METAL TUBE TO A METAL SHELL, COMPRISING: FORMING A FLARING INTERNAL SURFACE ON AN END PORTION OF THE TUBE, POSITIONING A METAL FERRULE HAVING A CENTRAL BORE AND HAVING AN END SECTION EXTERNALLY TAPERED AND COATED WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYMERIC MATERIAL, GLASS AND CERAMIC, SO THAT THE TAPERED AND COATED SECTION OF THE FERRULE EXTENDS INTO AND SEATS WITHIN THE FLARING SURFACE OF THE TUBE, ENCIRCLING THE FERRULE AND END PORTION OF THE TUBE WITH A METAL SHELL, POSITIONING A BODY OF SOLDER ADJACENT THE SHELL AND THE TUBE, WHEREBY AN ASSEMBLY IS FORMED, AND HEATING THE ASSEMBLY TO A TEMPERATURE SUFFICIENT TO MELT THE SOLDER AND TO CAUSE THE MATERIAL TO FORM A BOND, WHEREBY UPON COOLING OF THE ASSEMBLY A JOINT OF SAID MATERIAL IS FORMED BETWEEN THE FERRULE AND SAID TUBE AND A SOLDER JOINT IS FORMED BETWEEN THE TUBE AND THE SHELL.