Effect of Reverse-threaded Pin on Mechanical Properties of Friction Stir Lap Welded Alclad 2024 Aluminum Alloy

doi:10.1016/j.jmst.2016.03.005

J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (7): 671-675.DOI: 10.1016/j.jmst.2016.03.005

Special Issue: FSW-and-FSP-articles-in-JMST-since-2015-(2017-2)；铝合金专辑； 2016-2017摩擦搅拌焊接专辑

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Effect of Reverse-threaded Pin on Mechanical Properties of Friction Stir Lap Welded Alclad 2024 Aluminum Alloy

Yumei Yue¹, Zhengwei Li¹, Shude Ji^{1, 2, *}, Yongxian Huang², Zhenlu Zhou¹

1 Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China; 2 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Received:2015-10-15 Revised:2016-01-19 Online:2016-07-10 Published:2016-10-10
Contact: Corresponding author. Ph.D.; Tel.: +86 24 89723472; Fax: +86 24 89723720. E-mail address: superjsd@163.com (S. Ji).
Supported by:
This work is supported by the National Natural Science Foundation of China (No.51204111), the Natural Science Foundation of Liaoning Province (Nos. 2013024004 and2014024008), the Project of Science and Technology Department of Liaoning Province(No. 2013222007) and the Aeronautical Science Foundation of China (No. 2014ZE54021).

Abstract

Abstract: In friction stir welding (FSW), tool geometry plays an important role in joint quality. In order to improve mechanical properties of friction stir lap welding (FSLW) joint, a tool with a reverse-threaded pin was designed in the present study. Using 2024-T4 aluminum alloy as the research object, tools with the full-threaded pin and reverse-threaded pin were used in FSLW. Results showed that, when using the same parameter combination, FSLW joint using the reverse-threaded pin owned bigger effective sheet thickness (EST), bigger lap width and better lap shear failure strength. Compared with the full-threaded pin, fracture mode of the FSLW joint changed from shear fracture mode to tensile fracture mode when the reverse-threaded pin was used. Fracture morphologies presented ductile fracture.

Key words: Friction stir lap welding, Reverse-threaded pin, Hook, Fracture position

Yumei Yue, Zhengwei Li, Shude Ji, Yongxian Huang, Zhenlu Zhou. Effect of Reverse-threaded Pin on Mechanical Properties of Friction Stir Lap Welded Alclad 2024 Aluminum Alloy[J]. J. Mater. Sci. Technol., 2016, 32(7): 671-675.

Figures/Tables 9

Tools used in the experiment: (a) tool with the full-threaded pin; (b) tool with the reverse-threaded pin.

Schematic of FSLW in the present study.

Cross-section of the FSLW joints using different tools: (a) full-threaded pin; (b) reverse-threaded pin.

SZs of the FSLW joints using different tools: (a) full-threaded pin; (b) reverse-threaded pin.

TMAZs of the FSLW joints using different tools: (a) full-threaded pin; (b) reverse-threaded pin.

Load-displacement curves of the FSLW joints using two different tools.

Fracture positions of the FSLW joints using different tools: (a) full-threaded pin; (b) reverse-threaded pin.

Fracture morphologies of the FSLW joints using the full-threaded pin.

Fracture morphologies of the FSLW joints using the reverse-threaded pin.

References

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Effect of Reverse-threaded Pin on Mechanical Properties of Friction Stir Lap Welded Alclad 2024 Aluminum Alloy

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