铝合金错位翅片型水冷散热器真空钎焊工艺

Vacuum Brazing of Al Alloy Staggered Finned Water-cooled Radiator

研究铝合金错位翅片型水冷散热器的真空钎焊工艺。采用水浸超声仪对产品钎着率进行测量,采用检漏仪对产品的气密性进行测试,采用拉伸试验机对试样的强度、延伸率进行分析,采用硬度计对试样的布氏硬度进行测试。结果表明:温度曲线、工装装夹力矩、工装结构对钎着率有显著影响。随着保温时间适当延长,钎着率呈现上升趋势;随着工装装夹力矩的增大,钎着率也呈现上升趋势,最佳扭矩为120 N·m;工装结构会影响每垛最上层散热器焊合情况,在合适的钎焊温度曲线、装夹力与适宜的工装情况下,产品钎着率可达90%以上,检漏合格率高达99%。3003铝合金经真空钎焊后,力学性能有所下降,抗拉强度下降幅度为27.2%,规定非比例延伸强度下降幅度为34.1%,延伸率下降幅度为6.6%,硬度下降幅度为32.2%。

The vacuum brazing process of the aluminium alloy staggered finned water cooled radiator is studied,The water immersion ultrasonic instrument was used to measure the brazing rate of the product,the leak detector was used to measure the air tightness of the product,the tensile testing machine was used to measure the strength and elongation of the sample,and the hardness tester was used to measure the Brinell hardness of the sample.The results show that the temperature curve/the clamping moment and the fixture structure have a significant influence on the brazing rate.With the prolongation of the brazing time,the brazing rate show an upward trend,wih the increase of clamping moment,the brazing rate shows an upward trend too,the best moment is 120 N·m,and the fixture structure affect the brazing of the most upper radiator.In the appropri‐ate temperature curve,torque and tooling conditions,the brazing rate can be as high as 90%or more,the qualified rate of leak detection is up to 99%.After vacuum brazing,the mechanical properties of 3003 aluminum alloy decreased,the tensile strength decreased by 27.2%,the non-proportional elongation strength decreased by 34.1%,and the elongation decreased by 6.6%,the hardness decreased by 32.2%.