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

激光-电弧复合热源焊接异种镁合金的数值模拟和实验研究

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(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China;National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China;State Key Laboratory for Advanced Metals and Materials(University of Science and Technology Beijing),Beijing 100083,China)

机构地区：[1]School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China [2]National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China [3]State Key Laboratory for Advanced Metals and Materials(University of Science and Technology Beijing),Beijing 100083,China

出　　处：《Journal of Central South University》2022年第10期3476-3488,共13页中南大学学报（英文版）

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。

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 source”combination 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.本文为AZ31-AZ80异种镁合金激光-电弧复合热源焊接的热-力耦合过程建立了一个合适的数值模拟模型。首先,基于能量守恒定律和傅里叶热传导定律,建立了非线性瞬态热传导的三维温度场的微分方程并根据非线性瞬态热传导的分析,得到了代表初始条件和边界条件的方程。其次,选择了“双椭球热源+三维高斯热源”的组合形式来构建激光-电弧复合热源,对熔池的形态以及温度、应力、位移和塑性应变的分布进行了数值模拟。实际的焊接实验是在激光-电弧复合焊接机上完成的。最后,详细讨论了激光和电弧在镁合金的复合热源焊接中的相互作用机制。复合热源可以促进激光能量和电弧在熔池中的吸收,使能量在熔池中的分布更加均匀,焊接参数得到相应的改善。该工作可以为镁合金的激光-电弧混合焊接工艺的优化提供理论指导和数据支持。

关 键 词：hybrid laser-electric arc welding dissimilar Mg alloys welding numerical simulation interaction mechanisms welding optimizations 

分 类 号：TG456[金属学及工艺—焊接]