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.
Highlights
Laser impact welding (LIW) is a relatively novel welding technique
The bonding occurs along the edges of the weld nugget [7].The flyer velocity/movement for LIW should be studied to solve this common issue in LIW
The measured flyer velocity was lower than 500 m/s and the energy efficiency was not calculated for laser energy up to 52 J
Summary
Laser impact welding (LIW) is a relatively novel welding technique. The bonding occurs along the edges of the weld nugget [7].The flyer velocity/movement for LIW should be studied to solve this common issue in LIW. In the study of the laser-driven flyer, the flyer velocity was investigated by Brown et al [10]. The measured flyer velocity was lower than 500 m/s and the energy efficiency was not calculated for laser energy up to 52 J. In the study of LIW, Wang et al showed the flyer velocity as a function of time with various laser energy and flyer thickness [2,3]. The laser energy efficiency was investigated for various laser energy and flyer thickness by measuring the flyer velocity under those conditions. The parameters effect on the flyer velocity would provide instructions for the optimization of the current experimental setup
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