Method of manufacturing heat-exchanger

Details Method of manufacturing heat-exchanger Method of manufacturing heat-exchanger

1989-05-30

1990-03-27

Ramsey, Kenneth J.

Metal fusion bonding

Process

Plural joints

22826317, 148272, 427310, B23K 120, C23C 1416, C23C 1424

Patent

active

049113518

ABSTRACT:
A method of manufacturing heat-exchanger excellent in the pitting corrosion resistance is disclosed, wherein, in the manufacture of aluminum heat-exchanger to be brazed under heat in the furnace of inert gas atmosphere using fluoride flux, Zn is disposed at a position of 430.degree. to 620.degree. C. in the furnace to melt and vaporize it and the vapor of Zn is allowed to 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 than 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.

REFERENCES:
patent: 4645119 (1987-02-01), Haramaki et al.

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