title: Vibration characteristics of aluminum surface subjected to ultrasonic waves and their effect on wetting behavior of solder droplets.
abstract: 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.
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: xuzw@hit.edu.cn.
authors.forename: Zhiwu
authors.initials: Z
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Jiuchun
authors.initials: J
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Shiqin
authors.initials: S
authors.lastname: Yang
mesh_terms: D000535:Aluminum / Q000737:chemistry* / Q000528:radiation effects*; D019220:High-Energy Shock Waves; D008422:Materials Testing; D011829:Radiation Dosage; D014732:Vibration; D014896:Welding / Q000379:methods*; D017155:Wettability / Q000528:radiation effects; D017967:Zinc Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D017967:Zinc Compounds; C015510:soldering flux; D000535:Aluminum
keywords: Cavitation; Finite element analysis; Oxide film; Soldering; Ultrasonic vibration