Enhancement of Laser Impact Welding for Joining Thicker Aluminium Sheet
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Date
2025-08
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Abstract
This study critically examines the efficacy of Augmented Laser Impact Welding (ALIW) in
achieving high-quality welds by leveraging the effects of laser-induced plasma and controlled
impact forces. Therefore, various Gunpowder Nitromethane (GPN) compositions were
examined. The results demonstrated that the incorporation of 0.1 g of micro-air bubbles into a
mixture of 1 g smokeless powder and 10 g of 95% nitromethane significantly enhances the flyer
velocity. Moreover, the usage of Sapphire instead of borosilicate glass as a confinement layer
can be a great alternative due to its damage resistance after each laser shot. Furthermore, the
refined GPN composition was employed in experiments with a 1 mm Al 6061-T6 flyer, where
different spot sizes and varying GPN thicknesses were tested to determine the optimal
conditions for this specific flyer thickness. The findings revealed that the maximum flyer velocity
was achieved when using 0.54 mm of GPN-3 in conjunction with a 5.22 mm laser spot size.
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Keywords
Augmented Laser Impact Welding (ALIW), Impact Welding, and Detonation Energy, Photonic Doppler Velocimetry (PDV)
Subjects based on RSWK
Planar-Doppler-Velocimetry, Laserschweißen, Auftragsschweißen, Aluminiumblech