B - Operations – Transporting – 23 – P
Patent
B - Operations, Transporting
23
P
26/146
B23P 15/26 (2006.01) B23K 1/00 (2006.01) B23K 35/00 (2006.01) F28D 1/053 (2006.01) F28F 1/12 (2006.01) F28F 13/12 (2006.01) F28F 19/06 (2006.01)
Patent
CA 2021476
Potential difficulties with corrosion resistance in air cooled condensers 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 (55) and the tube (50) but a time insuffi- cient to convert the coating (82) and the cladding (88) to ferrous-aluminum intermetallic compound or intermediate phase.
Cette invention concerne une méthode d'assemblage des tubes et ailettes de condenseurs refroidis à l'air destiné à se prémunir contres les risques de corrosion. La méthode comprend les étapes suivantes : préparer un tube aplati (50) en métal ferreux à revêtement extérieur (82) principalement d'aluminium; préparer au moins une ailette en serpentin (56) en aluminium (86) plaqué de métal de brasage principalement à base d'aluminium (88); assembler (102) l'ailette (56) au tube aplati (50); appliquer (94), (100), (104) un flux de brasage fort soit sur l'ailette (56), soit sur le tube (50), soit sur les deux; chauffer (106) l'ensemble à une température suffisante pour au moins faire fondre en partie le placage en métal de brasage (88); et maintenir cette température assez longtemps pour former un joint brasé (60) entre l'ailette (56) et le tube (50) mais non pour transformer le revêtement (82) et le placage (88) en composé intermétallique ferro-alumineux.
Cottone Andrew J.
Saperstein Zalman P.
Finlayson & Singlehurst
Modine Manufacturing Company
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