2022 Fiscal Year Final Research Report
Multipass friction stir welding of the same or dissimilar thick aluminum alloy plates
| Project/Area Number |
17K06824
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Composite materials/Surface and interface engineering
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2023-03-31
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| Keywords | 摩擦攪拌接合 / アルミニウム合金 / 送給肉盛 / 多層多パス接合 / 厚板接合 / 汎用工作機械 |
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| Outline of Final Research Achievements |
This study is aimed to develop a method to build-up opened grooves by friction stir welding, as commonly operated in fusion welding, in order to relieve severe requirements on stiffness of friction stir welding machines. In the beginning, newly developed functional stationary-shoulder friction stir welding tool, which can feed welding wires into the welding zone, was applied. However, the stirred zone failed to weld the parent A6061 aluminum alloy plates with the building-up material. Therefore, the tool shape was redesigned to a common monolithic type. The shape of the grooves and the building-up materials were also changed to rectangular shape to fit the tool. By this change, the open grooves were successfully filled by the building-up materials. Finally, 2-layer 4-pass build-up friction stir welding of 10-mm-thick A6061 plates were demonstrated using conventional milling machine.
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| Free Research Field |
複合材料・表界面工学
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| Academic Significance and Societal Importance of the Research Achievements |
肉盛材連続送給による肉盛摩擦攪拌接合が可能であることを実証し，これを応用して低剛性の汎用工作機械でも厚板を多層多パス接合することが可能となった．これは高価な接合専用機がなくとも摩擦攪拌接合が可能であることを提示し，摩擦攪拌接合技術の普及を促進することにつながる．
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