水下搅拌摩擦焊发热对AA6068-T6铝合金残余应力的影响
Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy.
作者信息
Khalaf Hassanein I, Al-Sabur Raheem, Abdullah Mahmoud E, Kubit Andrzej, Derazkola Hamed Aghajani
机构信息
Mechanical Department, Engineering College, University of Basrah, Basrah 6100, Iraq.
Mechanical Department, Faculty of Technology and Education, Beni-Suef University, Beni-Suef 62511, Egypt.
出版信息
Materials (Basel). 2022 Mar 17;15(6):2223. doi: 10.3390/ma15062223.
This article aims to study water-cooling effects on residual stress friction stir welding (FSW) of AA6068-T6 aluminum alloy. For this reason, the FSW and submerged FSW processes are simulated by computational fluid dynamic (CFD) method to study heat generation. The increment hole drilling technique was used to measure the residual stress of welded samples. The simulation results show that materials softening during the FSW process are more than submerged. This phenomenon caused the residual stress of the joint line in the submerged case to be lower than in the regular FSW joint. On the other hand, the results revealed that the maximum residual stresses in both cases are below the yielding strength of the AA6068-T6 aluminum alloy. The results indicated that the residual stress along the longitudinal direction of the joint line is much larger than the transverse direction in both samples.
本文旨在研究水冷对AA6068-T6铝合金搅拌摩擦焊（FSW）残余应力的影响。为此，采用计算流体动力学（CFD）方法对搅拌摩擦焊和水下搅拌摩擦焊过程进行模拟，以研究热量产生情况。采用增量钻孔技术测量焊接试样的残余应力。模拟结果表明，搅拌摩擦焊过程中材料的软化程度大于水下搅拌摩擦焊。这种现象导致水下情况下焊缝处的残余应力低于常规搅拌摩擦焊接头。另一方面，结果表明两种情况下的最大残余应力均低于AA6068-T6铝合金的屈服强度。结果表明，两个试样中焊缝纵向的残余应力均远大于横向。
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