| 摘要 |
PROBLEM TO BE SOLVED: To obtain sufficient brazing strength of an inner fin brazing part and an outer fin brazing part by performing the internal brazing difficult for performing the flux coating in a flux-less brazing manner, and by performing the NB brazing of other parts. SOLUTION: In the method of manufacturing an aluminum-made heat exchanger with tubes 3 made of an aluminum alloy, inner fins 4 inserted in the tubes 3 and outer fins 5 provided between the tubes 3, a clad material covering the surface of a core with 0.3-1.0% magnesium (Mg) added to a brazing filler metal is used for the heat exchanger components 3, 4, 5, and the heat exchanger components 3, 4, 5 formed of the clad material are assembled, and then a nocolok flux is applied on the assembled heat exchanger components. Thereafter, the heat exchanger components 3, 4, 5 are heated at the temperature-rising rate of 30°C/min and joined with each other in the atmosphere filled with an inert gas with the oxygen (O<SB>2</SB>) concentration of≤10 ppm. COPYRIGHT: (C)2007,JPO&INPIT |
