Abstract
A new design of the welding tool for friction-stir welding (FSW) was proposed. The main idea was in using of a hemispherical tool probe. Such a tool is very simple (and cost-effective) in fabrication and provides excellent mixing of the material during FSW, thus avoiding welding defects. In this work, the feasibility of this tool for joining of Al-Mg-Mn-Zr alloy and its effect on the microstructure and mechanical properties of the produced welds were studied.
Highlights
Friction-stir welding (FSW) is a relatively simple but very effective technology for solid-state joining of structural materials [1,2,3,4,5,6]
Microstructure A typical appearance of the microstructure of the base material in the normal direction (ND)×RD and ND×transversal direction (TD) planes is shown in figure 2
The stir-zone microstructure was dominated by completely recrystallized fine grains with a mean size of ~1.4 μm and a fraction of high-angle boundaries (HABs) as high as 88%
Summary
Friction-stir welding (FSW) is a relatively simple but very effective technology for solid-state joining of structural materials [1,2,3,4,5,6]. The tool provides material mixing during the welding process, and, governs the microstructure and service properties of the produced welds. To enhance the mixing process, tools of very complex design are sometimes used [3,5]. This facilitates the material flow, but increases the production cost. Tools of this design should be relatively simple (and cost-effective) in production. The purpose of the present study was examination of feasibility of such a tool for joining of the Al-Mg-Mn-Zr alloy and its effect on the microstructure and mechanical properties of the produced welds
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