激光焊接铝合金材料过程的建模与仿真  

Modeling and Simulation of Laser Welding for Aluminium Alloy

作　　者：卢艳[1,2] 张静[2] 胡敬佩[2] 项俊锋[3] 

机构地区：[1]重庆大学光电工程学院,重庆400044 [2]重庆广播电视大学机电工程学院,重庆400052 [3]重庆大学国家传动重点实验室,重庆400044

出　　处：《热加工工艺》2012年第1期130-133,共4页Hot Working Technology

摘　　要：在试验基础上,利用有限元软件ANSYS对3A21铝合金材料激光焊接温度场进行了动态模拟。通过对激光焊接非线性瞬态过程的分析,分析与温度场有关的潜热、热传导、对流、辐射等材料热物理属性,建立了激光焊接的移动热源模型。仿真结果表明:激光焊接薄板铝合金的温度场梯度大,热影响区小;温度场中各点温度呈指数式升高和衰减;焊缝和近焊缝区温度升降急剧,焊缝宽度的仿真结果与试验结果相一致,从而验证了所建立的移动热源模型在激光焊接铝合金薄板温度场模拟中的适用性,在一定程度上揭示了激光焊接的成型机理。The distribution of the temperature field during laser welding based on aluminium alloy 3A21 was dynamically simulated by FEA software-ANSYS.In view of the highly non-linear characters of laser welding,a travel heat source combining with the body loads was built by analyzing the thermal physical parameters of material,such as latent heat of fusion,thermal conduction,convection and radiation.The results show that the temperature gradient of laser welding is larger,and HAZ is smaller than others.The temperature curves in the temperature fields rise and decline exponentiall,and the temperature in weld and near weld changes rapidly.The simulation results of width in the weld is in line with the experimental results,which verify the applicability of the model established by moving heat source during the laser welding based on aluminum alloy sheet applying to the temperature field simulation,and to a certain extent,the forming mechanism of the laser welding is revealed.

关 键 词：ANSYS 铝合金 激光焊接 仿真 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG456.7[金属学及工艺—金属材料]