Metal fusion bonding – Process – Encasing a rodlike core within a substantially coextensive...
Patent
1986-10-20
1988-05-17
Rowan, Kurt
Metal fusion bonding
Process
Encasing a rodlike core within a substantially coextensive...
228156, 228186, 228219, B23K 100
Patent
active
047445041
ABSTRACT:
A method of manufacturing an internally clad tubular product employing a cylindrical host formed such as of a first nickel base alloy including the steps of plating the internal surface of the host with a low melting point bonding metal alloy, inserting a cylindrical cladding member, such as of a second nickel base alloy, into the plated cylindrical host, circumferentially welding one end of the cladding member to one end of the host member directly and welding the other ends in such a manner as to incorporate a metallic gas reservoir, thus forming a subassembly, evacuating the annular space formed in the subassembly between the exterior of the cladding member and the interior of the cylindrical host of water vapor and oxygen, heating the subassembly to about 1650.degree. to 2200.degree. F. thereby melting the bonding metal alloy, and hot extruding the heated subassembly to metallically bond the cladding member to the cylindrical host by means of the mechanism of liquid interface diffusion bonding.
REFERENCES:
patent: 3121949 (1964-02-01), Wright
patent: 3963162 (1976-06-01), Taguchi
patent: 4367838 (1983-01-01), Yoshida
patent: 4604785 (1986-08-01), Eddens
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