Feasibility of friction stir welding using a hemispherical tool tilted towards the retreating side

被引：5

作者：

Ambrosio, D. ^{[1
]}

Sharma, A. ^{[1
]}

Mukuda, M. ^{[1
]}

Morisada, Y. ^{[1
]}

Fujii, H. ^{[1
]}

机构：

[1] Osaka Univ, Joining & Welding Res Inst, Ibaraki, Osaka 5600047, Japan

来源：

JOURNAL OF ADVANCED JOINING PROCESSES | 2024年 / 9卷

基金：

日本学术振兴会;

关键词：

Friction stir welding; Hemispherical tool; Material flow; Weld quality; Microstructure; ALUMINUM-ALLOY; MECHANICAL-PROPERTIES; WELDED AA6061-T6; NUGGET ZONE; JOINTS; STEEL; FLOW; PIN;

D O I：

10.1016/j.jajp.2023.100180

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 mu m 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.

引用

页数：13

共 27 条

[1] Microstructural variation through weld thickness and mechanical properties of peened friction stir welded 6061 aluminum alloy joints [J].