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.
Ultrason Sonochem. 2016 Mar;29:476-84. doi: 10.1016/j.ultsonch.2015.11.001. Epub 2015 Nov 2.
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.
作为一种新兴的焊接方法，功率超声已成功地引入到超声辅助电弧焊接过程中的电弧和熔池。利用外加超声场可以实现对熔融金属的先进处理。在声波的作用下，焊接热源等离子弧受到调节，其特性发生明显变化。与常规电弧相比，超声波辅助电弧等离子体受到明显的束缚，变得更加明亮。为了揭示声约束力对声场参数的依赖关系，建立了超声波辅助电弧焊接装置的二维声场模型。采用边界元法讨论了散热器高度、中心孔半径、散热器半径、曲率半径或凹面散热器表面深度对声场的影响。然后，通过声辐射功率与散热器高度之间的关系曲线，对谐振模式进行了分析。最后，通过优化声辐射器的几何参数，获得了最佳的声束缚能力。此外，系统地研究了三种凹面散热器表面，包括球形帽表面、旋转抛物面和旋转单曲面。最后，计算和实验均表明，为了获得最佳的声束缚能力，超声波辅助电弧焊接装置应在第一谐振模式下运行，采用具有球形帽表面、小孔、大截面半径和适当曲率半径的散热器。
