一种利用自适应发射率模型补偿搅拌摩擦焊温度场的方法  

A Method for Compensating the Temperature Field of Friction Stir Welding by Using Adaptive Emissivity

作　　者：张玉存[1] 徐子奇 李群[2] ZHANG Yucun;XU Ziqi;LI Qun(School of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066300,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066300 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《计量学报》2024年第7期1007-1014,共8页Acta Metrologica Sinica

基　　金：河北省自然科学基金(E2022415005,E2021415003);中央引导地方科技发展资金项目(216Z1801G,226Z1806G);河北省‘三三三人才工程’资助项目(A202101025)。

摘　　要：针对目前搅拌摩擦焊温度场研究大多忽略热辐射作用或者采用固定发射率模型导致误差较大的问题,提出一种考虑粗糙表面的铝合金氧化膜生长过程的自适应发射率模型,对焊接温度场进行补偿研究。首先,考虑到搅拌摩擦焊过程中铝合金表面形貌的动态变化,采用二次曲面响应法确定焊接表面粗糙度及其与平均线单位长度平均值的交点数;随后,基于提出的自适应发射率,建立6061铝合金搅拌摩擦焊过程的完全耦合有限元模型进行数值模拟,并对模拟结果进行分析。结果表明:不同焊接条件下,基于自适应发射率模型所得结果与实验结果之间的最大绝对误差仅为11 K,表明采用自适应发射率的数值模型能够较好地再现焊接过程中的温度场,可为提高搅拌摩擦焊焊接质量提供支持。Aiming at the problem that most of the current research on the temperature field of friction stir welding ignores the effect of thermal radiation or adopts the fixed emissivity model,which leads to large errors,an adaptive emissivity model considering the growth process of aluminum alloy oxide film on rough surface is proposed to compensate the welding temperature field.Firstly,considering the dynamic change of the surface morphology of aluminum alloy during friction stir welding,the quadratic surface response method was used to determine the welding surface roughness and the number of intersections with the average unit length of the average line.Subsequently,a fully coupled finite element model of 6061 aluminum alloy friction stir welding process was established based on the proposed adaptive emissivity,and the simulation results were analyzed.The results show that the maximum absolute error between the results obtained under different welding conditions and the experimental results is only 11 K,which indicates that the numerical model with adaptive emissivity can well reproduce the temperature field in the welding process.

关 键 词：温度计量 焊接温场 动态预测 温场补偿 自适应发射率 搅拌摩擦焊 铝合金氧化膜 

分 类 号：TB942[一般工业技术—计量学]