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Article

A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy

1
Department of Materials Engineering, Tarbiat Modares University, Tehran P.O. Box 14115-143, Iran
2
School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Sichuan 221116, China
3
UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(4), 436; https://doi.org/10.3390/met10040436
Received: 21 February 2020 / Revised: 19 March 2020 / Accepted: 24 March 2020 / Published: 27 March 2020
(This article belongs to the Special Issue Advanced Welding Technology in Metals)
The thermal regime and microstructural phenomenon are studied by using finite-element (FE) modelling and the analytical Rosenthal equation during laser welding of aluminum alloy 5456 (AA5456) components. A major goal is to determine the merits and demerits of this analytical equation which can be an alternative to FE analysis, and to evaluate the effect of imperative assumptions on predicted consequences. Using results from the analytical and numerical approaches in conjunction with experiments, different physical features are compared. In this study, the results obtained from experiments in terms of melt pool shapes are compared with the predicted ones achieved from the numerical and analytical approaches in which the FE model is more accurate than the Rosenthal equation in the estimation of the melt pool dimensions. Furthermore, as to the partially melted zones, the estimations achieved from the numerical modeling are more genuine than ones from the analytical equation with regards to the experimental results. At high energy density, near keyhole welding mode, the reported results show that experimental melt widths are supposed to be narrower than the fusion widths estimated by the analytical solution. The primary explanation could be the influence of thermal losses that occurred during convection and radiation, which are neglected in the Rosenthal equation. Additionally, the primary dendrite arm spacing (PDAS) estimated with the numerical modeling and the analytical Rosenthal solution is comparable with the experimental results obtained. View Full-Text
Keywords: laser welding; numerical finite-element modeling; analytical Rosenthal equation; thermal regime; microstructure; AA5456 laser welding; numerical finite-element modeling; analytical Rosenthal equation; thermal regime; microstructure; AA5456
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MDPI and ACS Style

Hekmatjou, H.; Zeng, Z.; Shen, J.; Oliveira, J.P.; Naffakh-Moosavy, H. A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy. Metals 2020, 10, 436. https://doi.org/10.3390/met10040436

AMA Style

Hekmatjou H, Zeng Z, Shen J, Oliveira JP, Naffakh-Moosavy H. A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy. Metals. 2020; 10(4):436. https://doi.org/10.3390/met10040436

Chicago/Turabian Style

Hekmatjou, Hamidreza, Zhi Zeng, Jiajia Shen, J. P. Oliveira, and Homam Naffakh-Moosavy. 2020. "A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy" Metals 10, no. 4: 436. https://doi.org/10.3390/met10040436

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