Solderless metallurgical joint
AssigneePeerless of America, Inc.
InventorFranz X. Wohrstein
Life of this patent
Estimating the term…
Abstract
A metallurgical joint between a copper tube and an aluminum tube is disclosed. The metallurgical joint between the tubes is elongated and extends along the length of the telescoping tubes and is substantially free of materials other than copper and aluminum. A method and apparatus for making the metallurgical joint is disclosed.
Claims17
A method of providing a metallurgical joint between first and second tubular members comprising the steps of:
- mounting the first and second tubular members having open ends thereof, in axial aligned position with respect to one another;
- positioning the ends of the first and second tubular members in abutting relationship;
- heating the end of at least one of said first and second tubular members to at least the eutectic temperature of the materials comprising the metallurgical joint;
- telescoping movement of one of either of said first and second tubular members with respect to the other member to provide a forced fit between the outside surface of one of said members and the inside surface of the other of said members to provide a linearly extending joint between the tubular members, said forced fit serving to expand the outermost tube;
- and
- cooling the ends of the joined tubular members to provide the linear metallurgical joint between the tubular members with the interior of said joined tubular members being free of debris from the formed joint.
A metallurgical eutectic joint between a copper tube and an aluminum tube with the aluminum tube being greater in diameter than the copper tube, each having open ends therein, wherein said metallurgical eutectic joint extends in a longitudinal direction of between about 0.25 to 1.00 inches and is comprised of between about 60-70per cent aluminum and 40-30 per cent copper.
A method of providing a metallurgical eutectic joint between first and second tubular member with one of the tubular members being comprised of cooper and the other tubular members being comprised of aluminum, comprising the steps of:
- swaging the end of the copper tubular member to provide a tapered outer surface adjacent the end thereof;
- mounting the first and second tubular members, in axial aligned position with respect to one another;
- positioning the ends of the first and second tubular members in abutting relationship;
- heating the ends of said first and second tubular members to at least the eutectic temperature of the materials comprising the metallurgical joint;
- telescoping movement of one of either of said first and second tubular members with respect to the other member to provide a forced fit between the outside surface of one of said members and the tapered inside surface of the other of said members to provide a linearly extending joint between the tubular members;
- and
- cooling the ends of the joined tubular members to provide the linear metallurgical joint between the tubular members.
Dependencies are inferred from the claim text.