Process of producing corrosion-resistant tubular connection piec

Details Process of producing corrosion-resistant tubular connection piec Process of producing corrosion-resistant tubular connection piec

1982-04-13

1984-06-19

Ramsey, Kenneth J.

Metal fusion bonding

Process

Encasing a rodlike core within a substantially coextensive...

228175, 228243, B23K 3102

Patent

active

044549776

ABSTRACT:
In order to connect a tube of a more common material, such as stainless steel, to a tube of a highly corrosion-resistant metal such as tantalum, where the two tubes cannot be welded together by fussion technology, a connection piece is made of two closely fitting layers of the two materials telescoped into each other, which are exposed to hot compressed noble gas, such as argon, in a pressure vessel, with precautions against oxidation from residual oxygen in the noble gas. Then the ends are machined to remove any hard soldered portion used to make a gas-tight seal of the blank before pressure treatment, after which a longer ring-shaped section of the stainless part of the connection piece is removed at one end and likewise a section of the tantalum part of the connection piece at the other end, so that the projecting ends can be welded to the pipes to be joined. One method of protection against oxidation is to use a blank in which a tantalum tube is fitted between two stainless steel tubes, one of which is completely removed by machining after the pressure treatment.

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