Al/Ti异质合金回填式搅拌摩擦点焊数值模拟
Numerical Simulation of Al/Ti Dissimilar Alloys Refill Friction Stir Spot Welding
宋奎晶 1韦勇 1徐萌 2季雨凯 1刘鑫泉 1张铭雨 1杨蓓 1钟志宏1
作者信息
- 1. 合肥工业大学 材料科学与工程学院,安徽 合肥 230009
- 2. 航天工程装备(苏州)有限公司,江苏 苏州 215200
- 折叠
摘要
采用耦合的欧拉-拉格朗日(CEL)算法对 2 mm厚的 5A02 铝合金/TC4 钛合金板异质金属回填式搅拌摩擦点焊过程展开模拟研究,分析了旋转速度和停留时间对焊点成型过程中温度场、等效塑性应变场以及材料流动的影响.结果表明,在扎入初期,热累积作用明显,升温速率相对较快,随焊接过程进行,产热会由摩擦产热转变为摩擦和塑性变形共同产热,升温速率放缓.当搅拌头转速为 2000 r/min、扎入速度为 1 mm/s、扎入深度为 1.9 mm、回填速度为 1 mm/s、停留时间为 0 s时,铝合金焊核区温度峰值达到 558℃,等效塑性应变峰值达到 120.在模拟的工艺区间内,焊核区峰值温度与旋转速度呈正相关,停留时间对温度的影响并不明显.
Abstract
Refill friction stir spot welding(RFSSW)of dissimilar alloys of 2 mm thick 5A02 aluminum alloy/TC4 titanium alloy plates was simulated by coupled Euler-Lagrange(CEL)algorithm.The effects of rotation speed and dwell time on the temperature field,equivalent plastic strain field and material flow during RFSSW were analyzed.The results show that at the initial stage of welding,the heat accumulation is obvious and the heating rate is relatively fast.As the welding process continues,the heat generation form transfers form friction heat to friction and plastic deformation,and the heating rate slowed down.Under the stirring tool rotation speed of 2000 r/min,plunging rate of 1mm/s,plunging depth of 1.9 mm,retracting rate of 1mm/s,dwell time of 0 s,the peak temperature of nugget zone at the Al alloy side reaches 558℃and the maximum equivalent plastic strain is 120.In the simulated process range,the peak temperature of the nugget zone is proportional to the rotation speed of stirring tool.The effect of dwell time on the temperature is not obvious.
关键词
回填式搅拌摩擦点焊/耦合的欧拉-拉格朗日/异质合金/温度场/等效塑性应变Key words
refill friction stir spot welding/coupled Euler-Lagrange(CEL)/dissimilar alloys/temperature field/equivalent plastic strain引用本文复制引用
基金项目
国家自然科学基金项目(51905143)
中央高校基本科研业务费专项资金资助项目(JZ2018HGTA0209)
出版年
2024
NETL
NSTL
万方数据