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首页> 外文期刊>Journal of Materials Engineering and Performance >A Weighting Grade-Based Optimization Method for Determining Refill Friction Stir Spot Welding Process Parameters
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A Weighting Grade-Based Optimization Method for Determining Refill Friction Stir Spot Welding Process Parameters

机译：基于级的基于级别的优化方法，用于确定补充摩擦搅拌点焊工艺参数

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摘要

The welding process used in fabricating thin-walled structures by refill friction stir spot welding (RFSSW) should be characterized by a high strength of welds and high process repeatability which is demonstrated by a small dispersion of the load capacity of the joints. The present work is designed to optimize RFSSW process parameters for 7075-T6 Alclad aluminum alloy sheets used to fabricate aircraft structures. The optimization was performed by scalarization of the objective function using the weighting grades method. The study considers the effect of process parameters, i.e., tool plunge depth, duration of welding, tool rotational speed, on the tensile/shear strength of the joints, and dispersion of the load capacity. It was found that it was possible to choose the optimal welding parameters taking into account maximization of the load capacity and minimization of the dispersion of the joint strength via a best compromise between the tool rotational speed ensuring adequate plasticization of the base material and the duration of welding ensuring that a fine-grained joint microstructure is obtained.
机译：通过补充摩擦搅拌点焊接（RFSSW）制造薄壁结构的焊接过程应通过高强度的焊接强度和高过程重复性，其通过关节的负载能力的小分散来证明。本工作旨在优化用于制造飞机结构的7075-T6 Alclad铝合金板的RFSSW工艺参数。通过使用加权等级法测定目标函数来执行优化。该研究考虑了工艺参数，即工具插入深度，焊接持续时间，刀具转速，接头的拉伸/剪切强度以及负载能力的分散。发现可以选择最佳焊接参数，以考虑负载能力的最大化，并通过刀具转速之间的最佳折衷能力最小化接头强度的分散，确保基材的充分塑化和持续时间焊接确保获得细粒的关节微观结构。

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