Finned assembly for heat exchangers

Details Finned assembly for heat exchangers Finned assembly for heat exchangers

1993-03-29

1994-01-11

Heinrich, Samuel M.

Metal fusion bonding

Process

With protecting of work or filler or applying flux

148531, 22826243, 2282625, B23K 119, B23K10310

Patent

active

052773582

ABSTRACT:
Potential difficulties with corrosion in heat exchangers utilizing aluminum fins are avoided by using fin and tube constructions made by a method which includes the steps of providing a flattened tube (50) of ferrous material (80) and having an exterior coating (82) predominantly of aluminum; providing at least one serpentine fin (56) of aluminum (86) and clad with a predominantly aluminum braze cladding (88); assembling (102) the fin (56) to the flattened tube (50); applying (94), (100), (104), a brazing flux to at least one of the fin (56) and the tube (50); raising (106) the temperature of the assembly to a level sufficient to at least partially melt the braze cladding (88); and maintaining the temperature for a sufficient period of time to achieve a brazed joint (60) between the fin (56) and the tube (50) but a time insufficient to convert the coating (82) and the cladding (88) to ferrous-aluminum intermetallic compound or intermediate phase.

REFERENCES:
patent: 3701196 (1972-10-01), Kiesow et al.
patent: 4655852 (1987-04-01), Rallis

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