摘要
针对以往搅拌摩擦焊数值模拟中采用的热源模型较为简单,不能很好反映出实际焊接过程中温度场的分布,而做试验又需要巨大投入的情况,课题组基于热弹塑性法和改良的热源模型,利用ABAQUS软件及其DFLUX子程序接口建立了304不锈钢和5052铝合金搅拌摩擦焊的数值模型,对铝合金-钢异种材料的搅拌摩擦焊过程进行了数值模拟,分析了焊接过程的温度场,同时对偏置量、转速和焊速3个焊接参数进行优化,发现在转速取500 r·min^-1,焊速取80 mm/min,偏置量取2 mm的情况下,得到的焊接过程瞬态及稳态温度场均处于理想状态。模拟准确地预测了实际焊接过程中的温度变化,且对实际焊接过程中焊接参数的选择具有一定参考意义,减少了为得到合适参数而进行的大量试验的成本。模拟结果能指导和预测实际焊接过程。
The heat source model used in the past numerical simulation of friction stir welding was relatively simple,it cannot well reflect the distribution of temperature field in the actual welding process,and the experiments needs huge investment. Based on thermal elastic-plastic method and improved heat source model,adopted ABAQUS software and DFLUX subroutine interface to establish the numerical model of 304 stainless steel and 5052 aluminium alloy friction stir welding,the process of aluminium alloy friction stir welding of dissimilar materials-steel were simulated and analyzed the temperature field of welding process,the offset at the same time,speed,and three optimized welding parameters,welding speed was found in speed 500 r/min,welding speed take 80 mm/min,take 2 mm offset,get the welding process of the transient and steady state temperature field in the ideal state. The simulation is more accurate in predicting the temperature change in the actual welding process,and it has a certain guiding role in the selection of welding parameters in the actual welding process,reducing the waste of a large number of tests to obtain the appropriate parameters. The simulation results can guide and predict the actual welding process.
作者
苗臣怀
曹丽杰
殷凯
王楠楠
MIAO Chenhuai;CAO Lijie;YIN Kai;WANG Nannan(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science'Shanghai 201620,China)
出处
《轻工机械》
CAS
2019年第6期82-87,共6页
Light Industry Machinery
关键词
铝-钢异种材料
搅拌摩擦焊
温度场
热弹塑性法
改进热源模型
ABAQUS软件
aluminum alloy-steel dissimilar materials
friction stir welding
temperature field
thermal elastic-plastic method
improved heat source model
ABAQUS
