Metallurgical bonding of dissimilar metal tubes
AssigneeHuron Tech Corp
InventorsScott A. Loftfield, Richard E. Loftfield
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Abstract
A method of metallurgically joining dissimilar metal tubes using a connecting member clad metal tube in which the clad metal is the same or similar metal to a metal of one of the dissimilar tubes to be joined and is susceptible to bonding by welding. The underlying clad metal connecting member metal is a dissimilar metal which is susceptible to bonding by soldering.
Claims5
A process for metallurgically bonding dissimilar metal tubes with a clad metal tube connecting member, said clad metal connecting member having a cladding layer of a corrosion resistant metal and an underlying layer of a corrosion susceptible metal, wherein said cladding metal and said underlying metal layer of said clad metal connecting member are of the same or similar metals as said dissimilar metal tubes and said cladding metal and said underlying metal layer of said tube connecting member are each metallurgically bondable with one of said tubes to be bonded, said process comprising:
- A. Removing from said clad metal tube connecting member a terminal portion of an underlying metal layer and metallurgically bonding the same or similar clad metal to a first metal tube and thereafter
- B. metallurgically bonding said underlying layer of said clad metal tube connecting member to a second metal tube,
- C. wherein said metal tubes comprise corrosion resistant metals selected from the group consisting of valve metals, alloys and mixtures thereof, platinum group metals which are metallurgically bonded by welding, and corrosion susceptible metals selected from the group consisting of copper, aluminum, and steel which are metallurgically bonded by soldering or welding.
A metallurgically bonded joint between dissimilar metal tubes comprising a corrosion resistant metal tube and a corrosion susceptible metal tube, said joint comprising:
- A. a clad metal tube connecting member having a corrosion resistant clad metal layer and a corrosion susceptible underlying layer wherein said tube connecting member comprises the same metals as said metal tubes to be bonded metallurgically,
- B. wherein said corrosion resistant metal tube is metallurgically bonded to a terminal portion of said clad metal connecting member from which a portion of said corrosion susceptible metal has been removed and,
- C. wherein said corrosion susceptible metal tube is metallurgically bonded to an opposite end of said clad metal connecting member tube with or without the removal of said corrosion resistant metal.
Dependencies are inferred from the claim text.