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Improvement in the Brazeability of Aluminum Clad Thinner Fin for Automotive Heat Exchanger
Technical Paper
2005-01-1390
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Through the years, aluminum automotive heat exchangers have been developed in order to have a high performance and a light weight. Therefore, the thickness of the aluminum sheets for the application has been reduced. As the brazeability declines with the reduction in thickness, fins having a thickness under 80μm may be difficult to secure a good brazeability. Therefore, we studied the brazeability to determine the limit of thickness using clad fins from 40 to 80μm. The fillet volume formed at the joints of the fin and tube decreased with the decreasing fin thickness and the Si content in both the filler metals and the core alloys. The suitable range of Si content in the filler metals and the core alloys to obtain a good brazeability decreased with the decreasing fin thickness. When the fins were thinner than the critical values, it was impossible to have a good brazeability. It was found that molten filler alloy was reduced by diffusion into the core during the heat up process before reaching the melting point of the filler alloy. Our results indicated that it was possible to obtain a good brazeability using the rapid heating cycles for brazing, even when the thickness was 40μm.
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Citation
Hisatomi, Y., Shoji, Y., Toyama, T., and Hasegawa, Y., "Improvement in the Brazeability of Aluminum Clad Thinner Fin for Automotive Heat Exchanger," SAE Technical Paper 2005-01-1390, 2005, https://doi.org/10.4271/2005-01-1390.Also In
Lightweight Castings and Aluminum Alloys for Advanced Automotive Applications
Number: SP-1948; Published: 2005-04-11
Number: SP-1948; Published: 2005-04-11
References
- Suzuki H. Itoh G. Koyama K. Journal of Japan Institute of Light Metals 34 1984 708
- Tohma K. Asano M. Takeuchi Y. J.I.L.M 37 1987 119
- Itoh G. Sugano M. J.I.L.M. 37 1987 754
- Aluminum brazing handbook Japan Light Metal Welding and Construction Association 1992 85
- Doko T. Asami S. Ishikawa K. J.I.L.M. 40 1990 138
- Maeda K. Itoh Y. Sumitomo Light Metal Technical Reports 35 1994 61
- Hirano K. J.I.L.M. 29 1979 249
- Bishop M. Fletcher K.E. Int. Met. Rev. 17 1972
- Terrill J.R. Weld.J. 45 1966 202-S