Finned assembly for heat exchangers

Details Finned assembly for heat exchangers Finned assembly for heat exchangers

1992-03-23

1994-04-26

Heinrich, Samuel M.

Metal fusion bonding

Process

Plural joints

228208, 228223, 22826243, B23K 3102

Patent

active

053059450

ABSTRACT:
Potential difficulties with corrosion in hear 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: 4032059 (1977-06-01), Plegat
patent: 4817857 (1989-04-01), Hargrove et al.
patent: 4831701 (1989-05-01), Yutaka
patent: 4951371 (1990-08-01), Dalo et al.
patent: 5042574 (1991-08-01), Cottone et al.
patent: 5102032 (1992-04-01), Cottone et al.

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