Heat generation and deformation in ultrasonic welding of magnesium alloy AZ31
Heat generation and deformation in ultrasonic welding of magnesium alloy AZ31
复制标题
DOI：
10.1016/j.jmatprotec.2019.05.016
复制
发表时间：
2019-10
影响因子：
6.3
通讯作者：
Hui-juan Huang;Jian Chen;Y. Lim;Xiaohua Hu;Jiahao Cheng;Zhili Feng;Xin Sun
中科院分区：
文献类型：
--
作者：
Hui-juan Huang;Jian Chen;Y. Lim;Xiaohua Hu;Jiahao Cheng;Zhili Feng;Xin Sun
建立了AZ31镁合金板材超声焊接的双声极边焊装置和有限元分析模型。利用高速摄像机对声纳电极振动进行了定量测量，并将其作为驱动力引入到模型中。红外相机捕捉到了板材边缘的瞬时温度场。通过对摩擦系数的参数研究，探讨了超临界流体的生热机理。为提高散热效果，应尽量减小散热界面处的摩擦力。通过实验测量了Fying界面的热历史和整个温度场，并进行了声压痕实验，验证了模型的正确性。利用所建立的模型，分析了不同焊接功率(或振动幅值)下相同能量输入下的超音速焊接，以表征超音速焊接的结合状况。在保持合理压痕的情况下，随着振动幅值的增大，焊缝内的温度明显升高。振动幅度而不是能量输入是AZ31板间形成键的关键因素。
A dual-sonotrode edge welding setup and a finite element analysis (FEA) model were developed for ultrasonic welding (USW) of AZ31 magnesium alloy sheets. Sonotrode vibration was measured quantitatively by a high-speed camera and introduced into the model as the driving force. The transient temperature field on the edge of the sheets was captured by an infrared camera. The heat generation mechanism in USW was investigated by a parametric study on the friction coefficient. Friction at faying interface should be smaller than those at other interfaces to enhance heat generation. The model was then validated by the experimental thermal history at the faying interface and the full temperature field as well as sonotrode indentation. Using the established model, USW under different welding powers (or vibration amplitudes) but at the same energy input was analyzed to characterize USW bond condition. Much higher temperature in the weld was observed with increasing vibration amplitudes, while reasonable indentation was maintained. Vibration amplitude other than energy input was a critical factor in bond formation between AZ31 sheets.