The brazing materials for radiators of automobiles and tractors at home and abroad are developing in the direction of low tin. The main purpose of developing low-tin solders abroad is to adapt to the development of high-parameter engines of automobiles and tractors, and to improve the performance of solders at higher temperatures. The main purpose of developing low-tin solder in China is currently limited to reducing the cost of solder.
As the tin content in the bP-Sn solder decreases, the wettability of the solder on the copper-based base material decreases linearly. When the tin content drops to about 15, the solder wettability is already very poor . Both the low-tin solders abroad and Gannan solders are difficult to promote due to their poor process performance.
Judging from the foreign research results on brazing materials for automotive radiators, the new brazing material should contain a small amount of silver to improve the creep resistance and tensile-tearing resistance of the brazing material; it should contain more than 8 tin to ensure brazing The corrosion resistance of the material. On this basis, seek suitable additional elements to improve the process performance of the solder.
The computer radiator detection system of automobile radiator leakage has been successfully applied in the radiator production line, and the automatic quantitative detection of radiator leakage has been realized. Improve product quality and save a lot of electrical energy. As long as high-quality electrical and pneumatic components are used in the implementation scheme, high-resolution differential pressure sensors are used, and a reasonable layout is adopted; proper handling of inflation, balance and stability, and measurement time can accurately and quickly measure the amount of heat leakage under inspection. The measuring principle can also be used for leak detection of sealing devices such as cylinder blocks and cylinder heads of internal combustion engines.
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