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Open AccessArticle

Fractal Dimension Characterization of Joint Surface Morphology on Dissimilar Friction Stir Lap Welding of Al/Mg

1
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2
School of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(23), 3941; https://doi.org/10.3390/ma12233941
Received: 1 November 2019 / Revised: 25 November 2019 / Accepted: 27 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Welding and Joining Processes of Materials)
The joint surface of the 1060 aluminum and AZ31 magnesium alloy was prepared through friction stir lap welding (FSLW) under different welding process parameters. The joint surface was characterized three-dimensionally using a three-dimensional (3D) optical profiler, and the coordinate data were obtained. The fractal dimension of the joint surface was calculated by the box-width transformation method using a MATLAB program. Furthermore, the influence of the welding process parameters on the fractal dimension of the joint surface was studied. The response surface model was established based on the principle of central composite design (CCD), and analysis of variance (ANOVA) was carried out to test the accuracy of the response surface. The results showed that the joint surface morphology had fractal characteristics, and the fractal dimension could be used as an index to characterize the quality of the joint surface. The change of the welding process parameters had a great impact on the fractal dimension of the joint surface, the interaction between the parameters was small, and the fitting accuracy of the response surface model was high. The fractal dimension of the joint surface decreased with the increase in the welding and rotational speeds and the effect of the rotational speed was more significant. View Full-Text
Keywords: friction stir lap welding (FSLW); fractal dimension; response surface method friction stir lap welding (FSLW); fractal dimension; response surface method
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MDPI and ACS Style

Zhao, Y.; Luo, Y.; Zhang, Z.; Zhang, H.; Guo, X.; Wang, S.; Cui, H.; Zhang, Y. Fractal Dimension Characterization of Joint Surface Morphology on Dissimilar Friction Stir Lap Welding of Al/Mg. Materials 2019, 12, 3941.

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