Today, aluminum is a widely used material in applications such as familiar beverage cans, food packaging, small items such as mobile terminals, and infrastructure such as automobiles and bullet trains. Various processing and manufacturing methods, especially brazing methods, have been developed for the manufacture of these materials since the industrial use of aluminum began. Heat exchangers installed in automobiles, which are becoming increasingly high-performance vehicles, have changed their material from copper to aluminum, resulting in lighter weight and higher performance. In addition, the demand for heat exchangers has increased in recent years with the advent of electric vehicles. Aluminum heat exchangers have become popular due to the development of the NOCOLOK brazing method, which has dramatically improved productivity and brazing accuracy. However, the manufacturing of heat exchangers still has some problems, such as the limitation of thinning fin material, contamination in the furnace due to the use of flux, and the environmental impact of flux, and there is more room for improvement. In this study, fluxless brazing was performed using a rapid heating method, and the effects of rapid heating and the brazing process on the specimens and their brazeability were evaluated by observing the appearance of the specimens and the microstructure of the brazed area.
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