6061-T6铝合金薄板双脉冲MIG焊动态组合热源模型  

Dynamic Combined Heat Source Model for Double-pulse MIG Welding of 6061-T6 Aluminum Alloy Thin Plates

作　　者：陈鑫[1] 杨立飞 王佳宁[1] 张冠宸 司徒德蓉[2] CHEN Xin;YANG Lifei;WANG Jianing;ZHANG Guanchen;SITU Derong(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China;School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545616,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130022 [2]广西科技大学机械与汽车工程学院,广西柳州545616

出　　处：《湖南大学学报（自然科学版）》2022年第12期83-91,共9页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划资助项目(2016YFB0101601-7)。

摘　　要：为准确得出铝合金薄板双脉冲熔化极惰性气体保护焊(双脉冲MIG焊)焊接温度场分布特征,提出一种基于铝合金薄板全熔透焊接热量分布及焊缝成形特点的动态组合热源模型,通过编写子程序,对有限元软件进行二次开发,实现动态组合热源模型在空间上的分布加载,得出仿真过程焊缝形貌及温度场分布特征.对2 mm厚6061-T6铝合金薄板进行双脉冲MIG焊对接焊接实验,得出焊缝形貌特征并记录测温点温度数据,绘制测温点的热循环曲线.对比仿真与实验结果发现,对于铝合金薄板全熔透焊接,利用动态组合热源模型得出的焊缝形貌与实际焊缝形貌拟合较好,温度场仿真误差在允许范围内,最大误差点出现在距焊缝20 mm处,最大误差为12.25%.In order to accurately obtain the temperature field distribution characteristics of double-pulse metal inert gas(MIG)welding of aluminum alloy plates,a dynamic combined welding heat source model based on the heat distribution and weld formation characteristics of full penetration welding was proposed.Through the preparation of subroutines and the secondary development of finite element software,the spatial distribution loading of the dynamic heat source model was realized,and the weld bead morphology and temperature field distribution characteristics in the simulation process were obtained.According to the simulation process parameters,the butt-welding experiment of 2 mm-thick 6061-T6 aluminum alloy plates was carried out by double-pulse MIG welding.The weld bead mor⁃phology characteristics were obtained,the temperature data of temperature measurement points were recorded,and the thermal cycle curves of temperature measurement points were drawn.By comparing the simulation and experimental results,it is found that,for the full penetration welding of aluminum alloy sheet,the weld morphology obtained by the dynamic combined heat source model is in good agreement with the actual weld bead morphology,and the simulation error of temperature field is within the allowable range.The maximum error point appears at 20 mm away from the weld,and the maximum error is 12.25%.

关 键 词：双脉冲MIG焊 铝合金 温度场 动态组合热源模型 熔滴过渡 

分 类 号：TG402[金属学及工艺—焊接]