CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2021-04-30 , DOI: 10.1016/j.cirpj.2021.03.015 Hesamoddin Aghajani Derazkola , Naser Kordani , Hamed Aghajani Derazkola
Friction stir welding tool tilt angle (TTA) is a vital parameter that influences the final joint quality. The underlying mechanism of TTA in T configuration joints has not been fully understood. In this research, the computational fluid dynamic method is implemented to investigate the effects of TTA on the study of thermal history, materials velocity, strain rate, and viscosity changes of Al-Mg-Si alloy. The critical issue in T-configuration joints is the interaction between flange and skin. This interaction should optimize the mixing pattern of flange and skin to obtain the strongest joint. Various range of TTA on heat transfer and stirring action between skin and flange are investigated. Material flow, microstructure changes, and tensile strength of joint assessed. Based on the obtained results, by increasing TTA, a higher temperature is generated on the advancing side (AS). It is attributed to the insufficient materials stirring action at lower TTA on the interface of skin and flange leads to incomplete joint formation. With increasing TTA, frictional and axial forces are increased but over stirring action leads to the formation of surface flash and tunnel defect in the skin-flange interface. This study’s results can be used for the application of TTA in the FSW of T-joint configurations.
中文翻译:
搅拌摩擦焊接工具倾斜角对Al-Mg-Si合金T型接头性能的影响
搅拌摩擦焊接工具的倾斜角(TTA)是影响最终接头质量的重要参数。T形接头中TTA的潜在机制尚未完全了解。在这项研究中,采用计算流体动力学方法来研究TTA对研究Al-Mg-Si合金的热历史,材料速度,应变速率和粘度变化的影响。T形接头中的关键问题是法兰和蒙皮之间的相互作用。这种相互作用应优化法兰和蒙皮的混合方式,以获得最牢固的接头。研究了TTA在蒙皮与法兰之间的传热和搅拌作用的各种范围。评估了材料的流动,微观结构的变化以及接头的抗拉强度。根据获得的结果,通过增加TTA,前进侧(AS)产生更高的温度。这归因于在较低的TTA下在皮肤和法兰的界面上的材料搅拌作用不足,导致不完整的关节形成。随着TTA的增加,摩擦力和轴向力会增加,但过度搅拌会导致在表皮-法兰界面形成表面毛边和隧道缺陷。这项研究的结果可用于TTA在T型接头构型的FSW中的应用。