The aim of the study is to investigate the consequences of tool traverse speed on force and torque distribution of friction-stir-welded third-generation Al–Cu–Li alloy joints. The microstructure and corresponding mechanical properties of the joints are investigated on force and torque perspective. Thus, the contribution of the present work lies in establishing the relation between traverse speed and mechanical properties of the AA2050-T84 joint. Four welds have been considered at varying traverse speeds from 1 to 4 mm/s at constant tool rotational speed and tool tilt angle of 1400 rpm and 2°, respectively. A tool of H13 steel having a tapered screw-threaded pin profile was used. The investigation reveals that with the increase in traverse speed, longitudinal force (X-force), vertically downward force (Z-force) and spindle torque also increase. The grain size of the nugget zone reduces from 19.84 to 14.86 µm as traverse speed increases. It has been found that the mechanical strength of the joint increases as the traverse speed increases. The Vickers microhardness value increases from 115 HV_0.1 to 131 HV_0.1 in the nugget zone as traverse speed increases from 1 to 4 mm/s. The maximum tensile strength, % elongation and joint efficiency are 403.2 MPa, 7.2% and 75.5% for traverse speed of 4 mm/s. The tensile fracture samples are analyzed by scanning electron microscope and reveal ductile mode of fracture.

本研究的目的是研究刀具移动速度对搅拌摩擦焊接的第三代Al-Cu-Li合金接头的力和扭矩分布的影响。从力和扭矩的角度研究了接头的微观结构和相应的机械性能。因此，本工作的贡献在于建立横移速度与AA2050-T84接头的机械性能之间的关系。已经考虑以恒定的工具转速和1400 rpm和2°的工具倾斜角分别以1到4 mm / s的横向速度变化进行四次焊接。使用具有锥形螺纹销轮廓的H13钢的工具。研究表明，随着横向速度的增加，纵向力（X力），垂直向下力（Z力）和主轴扭矩也会增加。随着运行速度的增加，熔核区的晶粒尺寸从19.84微米减小到14.86微米。已经发现，接头的机械强度随着横向速度的增加而增加。随着横移速度从1 mm / s增加到4 mm / s ，维氏显微硬度值在熔核区从115 HV _0.1增加到131 HV _0.1。对于4 mm / s的移动速度，最大抗拉强度，伸长率和接头效率分别为403.2 MPa，7.2％和75.5％。通过扫描电子显微镜分析拉伸断裂样品，并揭示断裂的韧性模式。