B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
26/145, 113/90
B23K 1/00 (2006.01) B23K 1/19 (2006.01) B23K 1/20 (2006.01) B23K 35/28 (2006.01)
Patent
CA 1295114
A METHOD OF MANUFACTURING A HEAT-EXCHANGER ABSTRACT A method of manufacturing a heat-exchanger with excellent pitting corrosion resistance is disclosed, wherein, in the manufacture of an aluminum heat-exchanger to be brazed under heat in a furnace having an inert gas atmosphere using fluoride flux, Zn at 430 to 620°C is fed to the furnace to melt and vaporize it and the vapor of Zn is allowed to make contact with the fin material and the tube material coated with said flux simultaneously with the brazing under heat of these aluminum components, or the fin material coated with said flux and dried, and the tube material without flux, are assembled and retained for not less that 1 minute in the vapor of Zn of a temperature lower than the melting point of said flux and higher than the temperature at which these components are heated, in the inert gas and thereafter brazing is performed at a temperature higher than the melting point of said flux. A method of concentrating Zn on the surface layer of said A1 components and a method of generating the Zn vapor for the concentration of surface Zn are also disclosed.
566900
Asami Shigenori
Ishikawa Kazunori
Borden Ladner Gervais Llp
Furukawa Aluminum Co. Ltd.
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