Abstract

This work deals with the regression models and multi-objective optimization method of the ultimate tensile strength, percentage of elongation, and average arithmetic surface roughness of butt friction stir welded AA2024-T3 aluminum alloy. Machining experiments were carried out according to the face centered central composite design of the response surface methodology. The effect of friction stir welding process parameters such as rotation speed, welding speed, and tool shoulder diameter on responses was investigated. Adequacies of the models are checked by the analysis of variance. The optimization of multiple responses was performed using the desirability analysis to achieve the higher ultimate tensile strength, maximum percentage of elongation, and minimum arithmetic surface roughness. From this investigation, it is found that the joints fabricated with the tool rotational speed of 752 rpm, welding speed of 100 mm/min, and tool shoulder diameter of 12.5 mm yield the maximum ultimate tensile strength and percentage of elongation, and minimum arithmetic surface roughness of 379.69 MPa, 10.22% MPa, and 6.66 HV, respectively. The effects of process parameters on the microhardness of welded zone were studied. The macrostructure, microstructure, and residual stress characterization of joints are examined.

中文翻译：

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使用响应面法和合意性方法对 AA2024-T3 搅拌摩擦焊工艺参数进行实验建模和多响应优化

摘要

【摘要】：研究了搅拌摩擦焊AA2024-T3铝合金的极限抗拉强度、延伸率和平均算术表面粗糙度的回归模型和多目标优化方法。根据响应面法的面心中心复合设计进行加工实验。研究了搅拌摩擦焊工艺参数（例如转速、焊接速度和工具肩直径）对响应的影响。通过方差分析来检查模型的充分性。使用合意性分析进行多重响应优化，以获得更高的极限拉伸强度、最大伸长率和最小算术表面粗糙度。研究发现，工具转速为 752 rpm、焊接速度为 100 mm/min、工具肩直径为 12.5 mm 时制造的接头具有最大极限抗拉强度和伸长率以及最小算术曲面粗糙度分别为 379.69 MPa、10.22% MPa 和 6.66 HV。研究了工艺参数对焊接区显微硬度的影响。检查接头的宏观结构、微观结构和残余应力特征。