Metal fusion bonding – Process – Plural joints
Patent
1974-10-18
1976-08-10
Jones, Jr., James L.
Metal fusion bonding
Process
Plural joints
291573R, 228217, 228248, B23K 104, B23K 3502
Patent
active
039737187
ABSTRACT:
A heat exchanger core includes a communicating set of metallic tubular elements, preferably aluminum, for carrying a primary fluid and a matrix of rounded metallic elements. The matrix elements are metallurgically bonded to one another and to the tubular elements. This arrangement of the matrix creates a multiplicity of communicating interstices which serve as passageways for the secondary fluid. The surface of the rounded elements constitutes the major area exposed to the secondary fluid flow. The rounded elements are metallurgically bonded by preferably a brazing technique. Relatively small particles of low melting temperature alloy, preferably aluminum, are dispersed throughout a stacked arrangement of relatively larger rounded elements, preferably of aluminum of a higher melting temperature. In one brazing method, an assembly of tubes, large rounded elements and smaller particles are brazed in a vacuum brazing oven. At the temperature of the oven, the smaller particles melt but the larger elements do not. Still another material, previously added, also melts and reacts with any oxide film present on the larger elements allowing the welded aluminum to fuse to these elements and to the tubes.
REFERENCES:
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patent: 2877903 (1959-03-01), Veres
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patent: 3656226 (1972-04-01), Burne
patent: 3673678 (1972-07-01), Moreau et al.
patent: 3762026 (1973-10-01), Shapiro
patent: 3885529 (1975-05-01), Renzi
DesChamps Laboratories, Inc.
Jones Jr. James L.
Ramsey K. J.
Raskin Martin G.
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