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Metals 2019, 9(3), 281; https://doi.org/10.3390/met9030281

Characteristics of Flyer Velocity in Laser Impact Welding

1
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
2
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
3
Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2019 / Revised: 17 February 2019 / Accepted: 26 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Impact Welding of Materials)
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Abstract

The flyer velocity is one of the critical parameters for welding to occur in laser impact welding (LIW) and plays a significant role on the welding mechanism study of LIW. It determines the collision pressure between the flyer and the target, and the standoff working distance. In this study, the flyer velocity was measured with Photon Doppler Velocimetry under various experimental conditions. The laser energy efficiency was compared with measured flyer velocity for various laser energy and flyer thickness. In order to reveal the standoff working window, the peak flyer velocity and flyer velocity characteristic before and after the peak velocity and the flyer velocity was measured over long distance. In addition, the rebound behavior of the flyer was captured to confirm the non-metallurgical bonding in the center of the weld nugget in LIW. Furthermore, the flyer size and confinement layer effect on the flyer velocity were investigated. View Full-Text
Keywords: flyer velocity; energy efficiency; peak velocity; flyer rebound; flyer size; confinement layer flyer velocity; energy efficiency; peak velocity; flyer rebound; flyer size; confinement layer
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Wang, H.; Wang, Y. Characteristics of Flyer Velocity in Laser Impact Welding. Metals 2019, 9, 281.

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