A promising solid-state welding technique, Friction Stir Welding- FSW- and its influence on microstructure and defects formation of the Al6061 welded plates and though consequence mechanical properties have formed the central part of the present study. The current research focuses on studying the effect of 3 crucial parameters of FSW, welding and rotating speed, and pin profile (each varying in 3 levels) on grains’ modification and the occurrence of flaws after nine designed trials with the help of the Taguchi method. Vickers micro-hardness and tensile tests were conducted to determine how the grain formation and defects affected mechanical properties. It was observed that all three central regions of the welded pieces, NZ, TMAZ, and HAZ, have experienced grain modification, plastic deformation, and defect formation with different severity. The distance of the region from the weld line, welding and rotating speeds, and ratios were affecting the severity of changes. According to the obtained results, HAZ showed less strength than others since all samples’ failure occurred in this zone. Higher values of hardness and tensile strength for each pin profile resulted from higher welding speeds and lower rotational ones.

一种很有前途的固态焊接技术，搅拌摩擦焊接-FSW-及其对 Al6061 焊接板的微观结构和缺陷形成的影响，尽管结果机械性能已成为本研究的核心部分。目前的研究重点是研究FSW、焊接和转速和销钉轮廓（各有3个级别）3个关键参数对经过9次设计试验后的晶粒变形和缺陷发生的影响，并借助田口方法. 进行维氏显微硬度和拉伸试验以确定晶粒形成和缺陷如何影响机械性能。观察到焊接件的所有三个中心区域，NZ、TMAZ 和 HAZ，都经历了不同严重程度的晶粒改性、塑性变形和缺陷形成。该区域与熔接线的距离、焊接和旋转速度以及比率都会影响变化的严重程度。根据获得的结果，HAZ 的强度低于其他区域，因为所有样品的失效都发生在该区域。由于较高的焊接速度和较低的旋转速度，每个销轮廓的硬度和抗拉强度值较高。