title: Effect of acoustic field parameters on arc acoustic binding during ultrasonic wave-assisted arc welding.
abstract: As a newly developed arc welding method, power ultrasound has been successfully introduced into arc and weld pool during ultrasonic wave-assisted arc welding process. The advanced process for molten metals can be realized by utilizing additional ultrasonic field. Under the action of the acoustic wave, the plasma arc as weld heat source is regulated and its characteristics make an obvious change. Compared with the conventional arc, the ultrasonic wave-assisted arc plasma is bound significantly and becomes brighter. To reveal the dependence of the acoustic binding force on acoustic field parameters, a two-dimensional acoustic field model for ultrasonic wave-assisted arc welding device is established. The influences of the radiator height, the central pore radius, the radiator radius, and curvature radius or depth of concave radiator surface are discussed using the boundary element method. Then the authors analyze the resonant mode by this relationship curve between acoustic radiation power and radiator height. Furthermore, the best acoustic binding ability is obtained by optimizing the geometric parameters of acoustic radiator. In addition, three concave radiator surfaces including spherical cap surface, paraboloid of revolution, and rotating single curved surface are investigated systematically. Finally, both the calculation and experiment suggest that, to obtain the best acoustic binding ability, the ultrasonic wave-assisted arc welding setup should be operated under the first resonant mode using a radiator with a spherical cap surface, a small central pore, a large section radius and an appropriate curvature radius.
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: xiewf1985@163.com.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Xie
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: fclwh@hit.edu.cn.
authors.forename: Chenglei
authors.initials: C
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: yangcl9@hit.edu.cn.
authors.forename: Chunli
authors.initials: C
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Sanbao
authors.initials: S
authors.lastname: Lin
keywords: Acoustic binding; Boundary element analysis; Radiator parameters; Ultrasonic wave-assisted arc