Friction Stir Spot Weldability of AA7075-T6 Sheets with a Pinless Tool Providing Enhanced Stirring Effect

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2024-11-14 DOI:10.1007/s11837-024-07005-3

Betül Gülçimen Çakan, Oğuz Tunçel, Mümin Tutar

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引用次数: 0

Abstract

The automotive and aerospace industries have explored alternative welding methods, such as friction stir welding (FSW) and its derivation, friction stir spot welding (FSSW). Welding parameters and tool shoulder designs influence material flow dynamics and stirring during the FSSW process. The current study uses a newly manufactured pinless tool to focus on the FSSW of 3-mm-thick AA7075-T6 aluminum sheets, which were joined using a pinless tool with a concave shape of three grooves for improved flow characteristics. The experiments explore the impact of welding parameters on the weld quality. Tensile tests, macroscopic examination, fracture surface analysis, and microhardness tests were performed. The geometric characteristics of hook shape and effective weld width substantially affected the tensile shear load (TSL). Tensile test findings and changes in effective weld width with welding parameters reveal that low rotational speed, high penetration depth, and dwell time parameters can result in a high TSL. Microhardness profiles reveal that the stir zone (SZ) exhibits the highest hardness values, reaching 27% above the base material hardness. The heat-affected zone (HAZ) shows the lowest hardness values. Fracture surface morphology analysis reveals different fracture modes in high and low TSL specimens.

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使用可增强搅拌效果的无针刺工具对 AA7075-T6 板材进行摩擦搅拌点焊

汽车和航空航天业已开始探索其他焊接方法，如搅拌摩擦焊（FSW）及其衍生方法搅拌摩擦点焊（FSSW）。焊接参数和工具肩设计会影响 FSSW 过程中的材料流动动力学和搅拌。本研究使用了一种新制造的无针工具，重点研究了 3 毫米厚 AA7075-T6 铝板的 FSSW，这些铝板是使用带有三个凹形槽的无针工具进行焊接的，以改善流动特性。实验探讨了焊接参数对焊接质量的影响。实验中进行了拉伸试验、宏观检查、断裂面分析和显微硬度测试。钩形和有效焊接宽度的几何特征对拉伸剪切载荷（TSL）有很大影响。拉伸试验结果和有效焊缝宽度随焊接参数的变化揭示了低转速、高熔深和停留时间参数可导致高 TSL。显微硬度曲线显示，搅拌区（SZ）的硬度值最高，比母材硬度高出 27%。热影响区 (HAZ) 的硬度值最低。断裂表面形态分析表明，高 TSL 和低 TSL 试样具有不同的断裂模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.