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Effect of Welding Speed on Joint Features and Lap Shear Properties of Stationary Shoulder FSLWed Alclad 2024 Al Alloy

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Abstract

Using alclad 2024-T4 aluminum alloy as the research object, stationary shoulder technology was used in friction stir lap welding process to investigate its performance in this study. Joint features and mechanical properties of the lap joints were mainly investigated. Results show that lap joint with smooth surface, without shoulder marks and inner defects can be obtained using the stationary shoulder technology. With increasing the welding speed from 40 to 130 mm/min, effective sheet thickness (EST) at the advancing side (AS) shows rather stable values (from 1.17 to 1.31 mm), EST at the retreating side (RS) increases from 0.57 to 1.13 mm, and stir zone width decreases from 4.95 to 4.44 mm. Lap shear failure load of the SSFSLW joints firstly increases and then decreases with increasing the welding speed. Using 100 mm/min, the maximum failure loads of 15.85 and 9.01 kN were obtained when the RS and AS of the joint bear the main load during the lap shear test. Shear fracture mode and tensile fracture mode can be obtained during the lap shear test. All joints present ductile fracture mode.

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Acknowledgment

This work is supported by the National Natural Science Foundation of China (No. 51204111), the Natural Science Foundation of Liaoning Province (No. 2014024008), the Program for Liaoning Excellent Talents in University (No. LJQ2015084) and the Aeronautical Science Foundation of China.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Zhiwu Xu & Zhengwei Li

  2. Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110136, People’s Republic of China

    Zan Lv & Liguo Zhang

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  1. Zhiwu Xu
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  2. Zhengwei Li
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  3. Zan Lv
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  4. Liguo Zhang
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Correspondence to Zhiwu Xu or Zan Lv.

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Xu, Z., Li, Z., Lv, Z. et al. Effect of Welding Speed on Joint Features and Lap Shear Properties of Stationary Shoulder FSLWed Alclad 2024 Al Alloy. J. of Materi Eng and Perform 26, 1358–1364 (2017). https://doi.org/10.1007/s11665-017-2527-8

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  • DOI: https://doi.org/10.1007/s11665-017-2527-8

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