焊接速度对飞机整体油箱异种铝合金搅拌摩擦焊接的影响  

Effect of Welding Speed on Friction Stir Welding of Dissimilar Aluminum Alloys in Aircraft Fuel Tanks

作　　者：丁清苗[1] 秦永祥 高宇宁 韩良 DING Qingmiao;QIN Yongxiang;Gao Yu'ning;Han Liang(Airport College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《热加工工艺》2021年第21期133-139,共7页Hot Working Technology

基　　金：2019年天津市研究生科研创新项目(2019YJSS069)。

摘　　要：基于COMSOL软件对民航常用飞机整体油箱7075铝合金和2024铝合金搅拌摩擦焊进行了多物理场耦合的数值模拟研究,分析了焊接速度对工件温度场、von Mises应力场以及形变量的影响,并通过实验对比验证了模型的准确性和可靠性。结果表明,在焊接过程中,铝合金工件的最高温度随着焊接速度的变化而改变,且温度Tmax与焊接速度u符合四次函数关系。最大残余应力随着焊接速度的增大逐渐减小,工件的最大应力产生在轴肩区域附近。7075和2024两种铝合金摩擦搅拌焊接过程中的形变量随着焊接速度的增大而逐渐减小。综合考虑焊接过程中工件的温度、残余应力、形变等因素,对于7075和2024异种铝合金的搅拌摩擦焊接,其焊接速度应为1.8 mm/s左右为宜。Based on COMSOL software,the multi-physics coupling numerical simulation of 7075 aluminum alloy and 2024 aluminum alloy friction stir welding of common fuel tanks in civil aviation aircraft was carried out.The effect of welding speed on the temperature field,the von Mises stress field,and the deformation of the workpiece was studied.The accuracy and reliability of the model were verified through experimental comparison.The results show that during the welding process,the maximum temperature of the Al alloy workpiece changes with the change of the welding speed,and the temperature Tmax and the welding speed u comply with the fourth-order function.The maximum residual stress gradually decreases with the increase of welding speed,and the maximum stress appears near the shaft shoulder zone.Deformation during friction stir welding of 7075 and 2024 aluminum alloys gradually decreases with the welding speed increasing.Considering the temperature,residual stress,deformation and other factors of the workpiece during the welding process comprehensively,the welding speed should be about 1.8 mm/s for the friction stir welding of 7075 and 2024 different aluminum alloys.

关 键 词：整体油箱 异种铝合金 搅拌摩擦焊 焊接速度 数值模拟 

分 类 号：TG453.9[金属学及工艺—焊接]