Patent ID: 6149049
Filing Date: 2000-11-21
Classification: B23K

Abstract:
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 thereafterB. 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.