Numerical simulation and experimental study of hybrid laser-electric arc welding between dissimilar Mg alloys

作     者：MA Yu-lin ZHU Jian ZHANG Long-mei REN Zhi-qiang ZHAO Yang WANG Wen-yu WANG Xiao-ming HUI Xi-dong WU Yong-ling ZHENG Hong-yu 马玉林;朱建;张龙梅;任智强;赵阳;王文宇;王晓明;惠希东;吴永玲;郑宏宇

作者机构：School of Mechanical EngineeringShandong University of TechnologyZibo 255000China National Key Laboratory for RemanufacturingArmy Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials(University of Science and Technology Beijing)Beijing 100083China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第10期

页      面：3476-3488页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Project(52004154) supported by the National Natural Science Foundation of China Project(ZR2020QE002) supported by the Shandong Provincial Natural Science Foundation,China Project(6142005190208) supported by the National Key Laboratory Foundation of China 

主　　题：hybrid laser-electric arc welding dissimilar Mg alloys welding numerical simulation interaction mechanisms welding optimizations 

摘      要：This work aims to establish a suitable numerical simulation model for hybrid laser-electric arc heat source welding of dissimilar Mg alloys between AZ31 and AZ80. Based on the energy conservation law and Fourier’s law of heat conduction, the differential equations of the three-dimensional temperature field for nonlinear transient heat conduction are built. According to the analysis of nonlinear transient heat transfer, the equations representing initial conditions and boundary conditions are obtained. The “double ellipsoidal heat source + 3D Gaussian heat sourcecombination was chosen to construct the laser-electric arc hybrid heat source. The weld bead morphologies and the distribution of temperature, stress, displacement and plastic strains are numerically simulated. The actual welding experiments were performed by a hybrid laser-electric arc welding machine. The interaction mechanism between laser and electric arc in the hybrid welding of Mg alloys is discussed in detail. The hybrid heat source can promote the absorption of laser energy and electric arc in the molten pool, resulting in more uniform energy distribution in the molten pool and the corresponding improvement of welding parameters. This work can provide theoretical guidance and data supports for the optimization of the hybrid laser-electric arc welding processes for Mg alloys.