Study on process and mechanism of laser drilling in water and air

An Inconel 718 sample was drilled in air and water using a diode-pumped nanosecond pulse laser with a pulse width of 8 ns and a wavelength of 532 nm. The surface, cross-section, and in-wall morphology were analyzed with a confocal laser scanning microscope and a scanning electron microscope. The pin...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2016-09, Vol.86 (5-8), p.1443-1451
Main Authors: Lv, Jing, Dong, Xia, Wang, Kedian, Duan, Wenqiang, Fan, Zhengjie, Mei, Xuesong
Format: Article
Language:English
Subjects:
CAE) and Design
Computer-Aided Engineering (CAD
Diameters
Drilling
Engineering
Flux density
Industrial and Production Engineering
Laser applications
Laser drilling
Lasers
Mechanical Engineering
Media Management
Morphology
Nanosecond pulses
Nickel base alloys
Original Article
Pressure effects
Pulse duration
Superalloys
Thickness
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Summary:An Inconel 718 sample was drilled in air and water using a diode-pumped nanosecond pulse laser with a pulse width of 8 ns and a wavelength of 532 nm. The surface, cross-section, and in-wall morphology were analyzed with a confocal laser scanning microscope and a scanning electron microscope. The pinnacle at the bottom of holes was more prone to exposure during water-assisted drilling. However, the in-wall of those holes was more rough. To better understand the mechanism of underwater drilling, the effects of pulse number, laser energy density, and water layer thickness were evaluated. An increase in the diameter of holes and a decrease in the debris and spatters on the surface were observed compared with the holes drilled in air. Also, an increase in the etching rate was observed under the high-energy condition. The physical effects of high pressure, fabricated by the bubbles and plasma in a water layer, were evaluated.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-015-8279-4