Comparative study on microstructure characteristics and mechanical properties of dissimilar friction stir welded aluminum alloy using single and double rotating shoulder tools

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-12-02 DOI:10.1007/s40194-024-01875-6

Jianhui Wu, Tao Sun, Zhenkui Liang, Guoqiang Huang, Wei Guan, Jicheng Gao, Lin Zhao, Yifu Shen

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引用次数: 0

Abstract

This study investigates the friction stir butt of 2024 aluminum alloy with 6061-T6 aluminum alloy using both double rotating shoulder friction stir welding (double rotating shoulder friction stir welding, DRS-FSW) and conventional friction stir welding (FSW) techniques. The differences in joint structure and morphology and mechanical properties between DRS-FSW and FSW joints were investigated. Defect-free joints were obtained for both DRS-FSW and FSW at a rotational speed of 600 r/min and a welding speed of 30 mm/min. Compared to the cross-section morphology of the dissimilar aluminum alloy joints of FSW, the morphology of the shoulder-affected zone (SAZ) and weld nugget zone (WNZ) of the DRS-FSW joints is more complex. The longitudinal morphology of the DRS-FSW joints shows complex material flow variations. The microstructure of the weld nugget zone (WNZ) of DRS-FSW joints is dominated by recrystallization. The microhardness magnitude and distribution are approximately the same for both. The FSW tensile properties are higher than those of DRS-FSW. Both DRS-FSW and FSW tensile fracture locations are in the heat-affected zone (HAZ) on the retreating side (RS) of the joint, and both exhibit ductile behavior. This paper is a further exploratory study of the double stirring technique.

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使用单肩和双肩旋转工具焊接异种摩擦搅拌铝合金的微观结构特征和机械性能对比研究

采用双旋转肩搅拌摩擦焊（双旋转肩搅拌摩擦焊，DRS-FSW）和传统搅拌摩擦焊（FSW）工艺对2024铝合金与6061-T6铝合金的搅拌摩擦对接进行了研究。研究了DRS-FSW与FSW接头在接头结构、形态和力学性能上的差异。在转速为600 r/min，焊接速度为30 mm/min的条件下，DRS-FSW和FSW均获得了无缺陷接头。与异种铝合金FSW接头的断面形貌相比，DRS-FSW接头肩影响区（SAZ）和焊核区（WNZ）的形貌更为复杂。DRS-FSW接头的纵向形貌表现出复杂的物质流动变化。DRS-FSW接头焊缝熔核区组织以再结晶为主。两者的显微硬度大小和分布大致相同。FSW的拉伸性能高于DRS-FSW。DRS-FSW和FSW拉伸断口均位于接头后退侧的热影响区（HAZ），且均表现出延性行为。本文是对双搅拌技术的进一步探索性研究。

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

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.