使用向后退一侧倾斜的半球形工具进行搅拌摩擦焊接的可行性

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
D. Ambrosio, A. Sharma, M. Mukuda, Y. Morisada, H. Fujii
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引用次数: 0

摘要

研究了使用向后退侧倾斜的半球形工具对 6061-T6 铝合金进行搅拌摩擦焊接的方法。焊接接头表面光滑且无内部空隙。在相同的焊接和旋转速度下,调整倾斜角度可以焊接厚度达 3.5 毫米的各种材料。事实证明,在使用半球形工具时,切入深度和倾斜角度是驱动材料流动的关键几何参数。焊缝的微观结构特征是在搅拌区和狭窄的热机械影响区内出现 5 微米以下的等轴和细化晶粒。半球形工具下方形成的通厚热机械梯度导致搅拌区出现不同程度的动态再结晶和恢复。工具朝向后退侧的方向以及工具与工件在连续和间歇接触中的相互作用导致了搅拌区周围不对称的热场。因此,新的衍生搅拌摩擦焊接解决方案允许使用同一工具焊接多种厚度的铝合金坯料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Feasibility of friction stir welding using a hemispherical tool tilted towards the retreating side

The use of a hemispherical tool tilted towards the retreating side for friction stir welding 6061-T6 aluminum alloy is investigated. Joints with smooth surfaces and without internal voids are obtained. Under the same welding and rotational speeds, adapting the tilt angle makes it possible to weld various thicknesses up to 3.5 mm. Plunge depth and tilt angle are demonstrated to be key geometrical parameters driving material flow when using the hemispherical tool. Microstructural features in the weld are equiaxed and refined grains below 5 µm in the stirred zone and narrow thermo-mechanical affected zones. The through-thickness thermomechanical gradient developing beneath the hemispherical tool leads to different extents of dynamic recrystallization and recovery in the stirred zone. The tool orientation towards the retreating side and the division of the tool-workpiece interaction in continuous and intermittent contact leads to an asymmetrical thermal field around the stirred zone. Hence, the new derivative friction stir welding solution allows the welding of multiple aluminum alloy blank thicknesses using the same tool.

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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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