基于 6061-t6 铝合金的新型插入式摩擦搅拌搭接焊

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materiali in tehnologije Pub Date : 2024-02-06 DOI:10.17222/mit.2023.839

Gaowei Cao, Jin Wang, Bo Gao, Kaicheng Mu, Hui Zhang, Baoge Li

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引用次数: 0

摘要

本研究提出了一种新型插入式搅拌摩擦搭接焊（PFSLW），用于制备基于 4 毫米厚 6061-T6 铝合金板材的焊接接头。讨论了 PFSLW 焊点与普通摩擦搅拌搭接焊（FSLW）焊点在截面形态、微观结构、截面硬度和剪切性能方面的差异。结果表明，PFSLW 接头的截面形态发生了变化。PFSLW 接头的前进侧具有机械互锁结构，有利于提高接头的连接强度。热机械影响区（TMAZ）和热影响区（HAZ）边界的晶粒结构不同，PFSLW 接头在边界附近的晶粒组织出现了更明显的弯曲变形。PFSLW 接头的显微硬度在 TMAZ 和 HAZ 区域有所提高，最低硬度出现在离焊缝中心较远的位置。PFSLW 接头的破坏载荷得到改善，PFSLW 接头的微裂纹部分具有脊状结构。此外，PFSLW 接头的实际焊接宽度也得到了改善。

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A NEW TYPE OF PLUG-IN FRICTION-STIR LAP WELDING BASED ON THE 6061-T6 ALUMINUM ALLOY

In this study a new type of plug-in friction-stir lap welding (PFSLW) is proposed to prepare welded joints based on 4-mm-thick 6061-T6 aluminum alloy sheet. The differences in the cross-sectional morphology, microstructure, cross-sectional hardness and shear properties between the PFSLW joint and the normal friction-stir lap-welding (FSLW) joint are discussed. The results show that the cross-sectional morphology of the PFSLW joint has undergone changes. The PFSLW joint has a mechanical interlocking structure on the advancing side that is beneficial to the connection strength of the joint. The grain structure differs at the boundary between the thermo-mechanically affected zone (TMAZ) and the heat-affected zone (HAZ), and the PFSLW joints show a more pronounced bending deformation of the grain organization near the boundary. The microhardness of PFSLW joints was increased in the TMAZ and HAZ areas, and the lowest hardness is further away from the center of the weld. The failure load of the PFSLW joint has been improved, the microcracks part of the PFSLW joint has a ridge-like structure. In addition, the actual welding width of PFSLW joints was improved.

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来源期刊

Materiali in tehnologije 工程技术-材料科学：综合

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal MATERIALI IN TEHNOLOGIJE/MATERIALS AND TECHNOLOGY is a scientific journal, devoted to original papers and review scientific papers concerned with the areas of fundamental and applied science and technology. Topics of particular interest include metallic materials, inorganic materials, polymers, vacuum technique and lately nanomaterials.