Influence of pin profiles on temperature distribution, microstructure evolution and mechanical properties of friction stir welded AA6061

Q4 Materials Science Welding International Pub Date : 2024-01-08 DOI:10.1080/09507116.2023.2293885

Vu Cong Hoa, Tra Ngoc Tien Dat, Do Huynh Nhu, Hao Dinh Duong, Tra Hung Tran

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Abstract

Abstract The friction stir welded (FSWed) butt-joints of 6061 aluminium alloy were fabricated by various pin geometries including cylindrical thread, tapered thread, triflate tapered thread and cylindrical non-thread. The attention was put on the role of the pin geometries in temperature distribution, microstructure evolution and mechanical properties of the joints. The history of changing welding temperature is validated through both experimental work and numerical simulation. The results showed that the highest welding temperature was obtained about 480 °C at triflate tapered thread pin in both experiment and numerical simulation. In all cases, the tensile strength was reached approximately 200 MPa with the joint efficiency of 80% in comparison with base metal. The fracture location of the joints was found in the heat affected zone, where the lowest value of hardness was obtained. The stress of root bend was lower than that of face bend. Crack-free on the welding surface of face bend indicated that the joints are ductile. However, the specific influence of pin geometries on the microstructure evolution and mechanical properties of the joints is insignificant in this work.

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销钉轮廓对摩擦搅拌焊接 AA6061 的温度分布、微观结构演变和机械性能的影响

摘要采用圆柱螺纹、锥形螺纹、三片式锥形螺纹和圆柱非螺纹等不同几何形状的销钉制造了 6061 铝合金的搅拌摩擦焊接（FSWed）对接接头。重点研究了销钉几何形状在温度分布、微观结构演变和接头机械性能方面的作用。通过实验工作和数值模拟验证了焊接温度的变化历史。结果表明，在实验和数值模拟中，三板锥形螺纹销的焊接温度最高，约为 480 ℃。在所有情况下，抗拉强度都达到了约 200 兆帕，与母材相比，接头效率达到了 80%。接头的断裂位置位于热影响区，那里的硬度值最低。根部弯曲的应力低于端面弯曲的应力。端面弯曲的焊接表面无裂纹，表明接头具有韧性。然而，在这项工作中，销钉几何形状对接头微观结构演变和机械性能的具体影响并不明显。

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Welding International Materials Science-Metals and Alloys

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0.70

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0.00%

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期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.