Method of manufacturing a large diameter internally clad tubular

Metal fusion bonding – Process – Encasing a rodlike core within a substantially coextensive...

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228186, 228132, 228127, 228219, B23K 100

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047549114

ABSTRACT:
A method of manufacturing an internally clad tubular product employing a tubular host such as steel, including the steps of plating the internal surface of the tubular host with a low melting point bonding metal alloy, inserting a tubular cladding member, such as of nickel base alloy, into the plated tubular 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 tubular host of water vapor and oxygen, assembling a close-fitting full-length tooling mandrel of high thermal expansion material inside the subassembly, heating the subassembly to about 1650.degree. to 2100.degree. F. thereby melting the bonding metal alloy, and using the greater coefficient of thermal expansion of the mandrel as compared to the tubular host and cladding member to eliminate all gaps and apply pressure between the work pieces to metallically bond the cladding member to the tubular host by means of the mechanism of liquid interface diffusion bonding.

REFERENCES:
patent: 3050613 (1962-08-01), Sheinhartz
patent: 3121949 (1964-02-01), Wright

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