State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
Ultrasonics. 2014 Mar;54(3):929-37. doi: 10.1016/j.ultras.2013.11.005. Epub 2013 Nov 20.
The vibration characteristics of an aluminum surface subjected to ultrasonic waves were investigated with a combination of numerical simulation and experimental testing. The wetting behavior of solder droplets on the vibrating aluminum surface was also examined. The results show that the vibration pattern of the aluminum surface is inhomogeneous. The amplitude of the aluminum surface exceeds the excitation amplitude in some zones, while the amplitude decreases nearly to zero in other zones. The distribution of the zero-amplitude zones is much less dependent on the strength of the vibration than on the location of the vibration source. The surface of the liquid solder vibrates at an ultrasonic frequency that is higher than the vibration source, and the amplitude of the liquid solder is almost twice that of the aluminum surface. The vibration of the surface of the base metal (liquid solder) correlates with the oxide film removal effect. Significant removal of the oxide film can be achieved within 2s when the amplitude of the aluminum surface is higher than 5.4 μm or when the amplitude of the liquid solder surface is higher than 10.2 μm.
采用数值模拟和实验测试相结合的方法研究了超声波作用下铝表面的振动特性，并研究了钎料液滴在振动铝表面的润湿行为。结果表明，铝表面的振动模式是不均匀的。在一些区域，铝表面的振幅超过了激励振幅，而在其他区域，振幅几乎降为零。零振幅区域的分布与振动强度的关系不大，而与振动源的位置关系更大。液态钎料的表面以高于振动源的超声频率振动，并且液态钎料的振幅几乎是铝表面的两倍。基底金属（液态钎料）表面的振动与氧化物膜去除效果有关。当铝表面的振幅高于 5.4μm 或液态钎料表面的振幅高于 10.2μm 时，可在 2s 内实现显著的氧化物膜去除。
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