Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1991-08-14
1992-12-22
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
228183, B23P 1526
Patent
active
051724766
ABSTRACT:
A condenser having single piece roll formed condenser tubes that are seam welded along an interfacing edge. The tube material is braze cladded on both sides for corrosion resistance and for high quality internal braze bonding of (1) longitudinal tube webs for optimizing burst strength, and (2) the tubes to associated air centers which are not cladded for an economical unit. The tubes can be readily made in a multiport or single port design by roll forming the longitudinal webs in each tube, and at discreet lengths along the tube length to provide a cut off area for sizing the tube and a smooth circumferential area where the tube enters the header providing a close fit and high quality brazed joints. This tube design provides material and cost advantage over the conventional extruded tubes and is readily fabricated using corrosion resistant alloys providing long service life. The number and spacing of the webs in this construction can be readily made by changing the number and spacing of the web forming rolls. The method provided by this invention provides increased output with higher machine speeds as compared to extrusion type processes.
REFERENCES:
patent: 1951394 (1934-03-01), Chase et al.
patent: 2252209 (1941-08-01), Schank et al.
patent: 3603384 (1971-09-01), Huggins et al.
patent: 4558695 (1985-12-01), Kumazawa et al.
Cuda Irene
General Motors Corporation
Griffin Patrick M.
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