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Metals 2016, 6(4), 87; doi:10.3390/met6040087

Effect of Welding Speed on Defect Features and Mechanical Performance of Friction Stir Lap Welded 7B04 Aluminum Alloy

State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110000, China
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Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 9 March 2016 / Revised: 6 April 2016 / Accepted: 11 April 2016 / Published: 15 April 2016
(This article belongs to the Special Issue Aluminum Alloys)
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Abstract

Friction stir lap welding of 7B04 aluminum alloy was conducted in the present paper, and the effect of welding speed on the defect features and mechanical performance of lap joints was investigated. The results indicate that the hook defect at the advancing side (AS) can reduce the effective thickness of the top sheet, and the sheet thinning level is gradually lowered by increasing the welding speed. The cold lap defect at the retreating side (RS) can result in effective thickness reduction in both top and bottom sheets, and the total height of the cold lap defect varies slightly with the welding speed. The tensile properties of the lap joints are largely related to the sheet thinning levels caused by the defects. The fracture strength of AS-loaded lap joints is progressively increased with increasing welding speed, while that of RS-loaded lap joints evolves slightly with welding speed. It is found that the affecting characteristic of loading configuration on the joint performance is also dependent on the welding speed. At lower welding speeds, the AS-loaded lap joints show lower fracture strength than the RS-loaded lap joints. When the welding speed is high, the AS-loaded lap joints present superior tensile properties to RS-loaded lap joints. View Full-Text
Keywords: friction stir lap welding; aluminum alloy; welding speed; defect feature; mechanical performance friction stir lap welding; aluminum alloy; welding speed; defect feature; mechanical performance
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Zhang, H.; Wang, M.; Zhang, X.; Zhu, Z.; Yu, T.; Yang, G. Effect of Welding Speed on Defect Features and Mechanical Performance of Friction Stir Lap Welded 7B04 Aluminum Alloy. Metals 2016, 6, 87.

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