Influence of Tool Offset on Performance of Thin Al–Cu Dissimilar Metal Friction Stir Butt Welded Joint

The 1-mm-thick Al to Cu friction stir welding is successfully performed at the tool offsets toward Al side ranging from 0 to 2 mm. With increasing tool offset, the phenomenon of material sticking to tool shoulder surface is restricted and the area of Al–Cu mixing zone is reduced progressively. As th...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2020-10, Vol.73 (10), p.2549-2559
Main Authors: Zhang, Hui-Jie, Liu, Hui-Jie, Song, Jian-Ling, Gao, Qiu-Zhi, Luo, Shao-Hua
Format: Article
Language:English
Subjects:
Aluminum
Butt joints
Butt welding
Chemistry and Materials Science
Copper
Corrosion and Coatings
Dissimilar metals
Friction stir welding
Hardness
Intermetallic phases
Materials Science
Metallic Materials
Offsets
Original Article
Tensile properties
Tensile strength
Tribology
Welded joints
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Description
Summary:The 1-mm-thick Al to Cu friction stir welding is successfully performed at the tool offsets toward Al side ranging from 0 to 2 mm. With increasing tool offset, the phenomenon of material sticking to tool shoulder surface is restricted and the area of Al–Cu mixing zone is reduced progressively. As the tool offset is increased from 0 to 1 mm, the weld shows a variation of intermetallic phases from CuAl 2  + Cu 9 Al 4 to CuAl 2 and exhibits a lowering in hardness and tensile properties. The 2-mm-offset weld without intermetallic phases discernible exhibits the highest hardness due to the thinness of Cu lamellar and Al-rich compound layers, and the joint featured by a failure at the relatively soft region adjacent to harder Al–Cu mixing zone in a ductile pattern shows the best tensile strength equivalent to 80% of that of the base material.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-020-02060-1