Fast Laser Cutting of Thin Metal

Wetzig, Andreas; Herwig, Patrick; Hauptmann, Jan; Baumann, Robert; Rauscher, P.; Schlosser, Michael; Pinder, Thomas; Leyens, Christoph

doi:10.1016/j.promfg.2019.02.150

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…Laser technology has been widely used in different industrial processes for many years, due to the characteristics of the laser source: high energy density, high efficiency, large temperature gradients, high repeatability of the process, and formation of a narrow heat-affected zone (HAZ) [1]. Nowadays, it is possible to find various research works on laser technologies such as laser welding [2,3], cutting [4,5], remelting [6,7], additive technologies [8,9] . .…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Laser Incidence Angle in the Surface of L-PBF Processed Parts

Sendino¹,

Gardon²,

Lartategui

et al. 2020

Coatings

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The manufacture of multiple parts on the same platform is a common procedure in the Laser Powder Bed Fusion (L-PBF) process. The main advantage is that the entire working volume of the machine is used and a greater number of parts are obtained, thus reducing inert gas volume, raw powder consumption, and manufacturing time. However, one of the main disadvantages of this method is the possible differences in quality and surface finish of the different parts manufactured on the same platform depending on their orientation and location, even if they are manufactured with the same process parameters and raw powder material. Throughout this study, these surface quality differences were studied, focusing on the variation of the surface roughness with the angle of incidence of the laser with respect to the platform. First, a characterization test was carried out to understand the behavior of the laser in the different areas of the platform. Then, the surface roughness, microstructure, and minimum thickness of vertical walls were analyzed in the different areas of the platform. These results were related to the angle of incidence of the laser. As it was observed, the laser is completely perpendicular only in the center of the platform, whilst at the border of the platform, due to the incidence angle, it melts an elliptical area, which affects the roughness and thickness of the manufactured part. The roughness increases from values of Sa = 5.489 μm in the central part of the platform to 27.473 μm at the outer borders while the thickness of the manufactured thin walls increases around 40 μm.

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Section: Introductionmentioning

confidence: 99%

The Effect of the Laser Incidence Angle in the Surface of L-PBF Processed Parts

Sendino¹,

Gardon²,

Lartategui

et al. 2020

Coatings

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“…These depend on the species nature, the gas pressure, and the laser spectral characteristics. In different published works (e.g., in [35,93,95]), the two-photon absorption cross-sections can be found in the following units:  cm 4 , which is the atomic lineshape-independent cross-section ( ( ) ) depending only on the nature of the atom;  cm 4 •s, resulting from the product: ( ) ( )G (2) ;  cm 4 •W −1 , resulting from the product: 2 ( ) g( )G (2) /hν, ν being the laser photon frequency.…”

Section: Stimulated Emissionmentioning

confidence: 99%

“…For instance, commercial lasers are widely used as multimode light sources in light shows for public entertainment. Additionally, they have been well-established in metallurgical industry for welding and cutting of different metals [4,5]. Their implementation in many other aspects of everyday life is also well-known, including laser projectors, printers, pointers, lithography, micromachining, medical lasers for aesthetic purposes, surgery and dentistry, laser microscopy, elemental analysis of numerous materials/substances (including space exploration), and many other examples [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Progresses on the Use of Two-Photon Absorption Laser Induced Fluorescence (TALIF) Diagnostics for Measuring Absolute Atomic Densities in Plasmas and Flames

Lombardi

Aubert

Duluard

et al. 2021

Plasma

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Recent developments in plasma science and technology have opened new areas of research both for fundamental purposes (e.g., description of key physical phenomena involved in laboratory plasmas) and novel applications (material synthesis, microelectronics, thin film deposition, biomedicine, environment, flow control, to name a few). With the increasing availability of advanced optical diagnostics (fast framing imaging, gas flow visualization, emission/absorption spectroscopy, etc.), a better understanding of the physicochemical processes taking place in different electrical discharges has been achieved. In this direction, the implementation of fast (ns) and ultrafast (ps and fs) lasers has been essential for the precise determination of the electron density and temperature, the axial and radial gradients of electric fields, the gas temperature, and the absolute density of ground-state reactive atoms and molecules in non-equilibrium plasmas. For those species, the use of laser-based spectroscopy has led to their in situ quantification with high temporal and spatial resolution, with excellent sensitivity. The present review is dedicated to the advances of twophoton absorption laser induced fluorescence (TALIF) techniques for the measurement of reactive species densities (particularly atoms such as N, H and O) in a wide range of pressures in plasmas and flames. The requirements for the appropriate implementation of TALIF techniques as well as their fundamental principles are presented based on representative published works. The limitations on the density determination imposed by different factors are also discussed. These may refer to the increasing pressure of the probed medium (leading to a significant collisional quenching of excited states), and other issues originating in the high instantaneous power density of the lasers used (such as photodissociation, amplified stimulated emission, and photoionization, resulting to the saturation of the optical transition of interest).

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“…In particular, the selective change in the surface topography is playing an increasingly important role to enhance the surface properties of many products or devices, for example reducing the adhesion of ice 1 , 2 , modifying the friction 3 or tuning the wettability of a surface 4 . Moreover, laser micro-processing is replacing conventional methods in many other areas such as welding of materials 5 , drilling of boreholes 6 and cutting of thin material 7 . As part of this replacement process, approaches for process monitoring and control have been established.…”

Section: Introductionmentioning

confidence: 99%

Detection and analysis of photo-acoustic emission in Direct Laser Interference Patterning

Steege

Alamri

Lasagni

et al. 2021

Sci Rep

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Functional laser texturing by means of Direct Laser Interference Patterning is one of the most efficient approaches to fabricate well-defined micro textures which mimic natural surfaces, such as the lotus effect for self-cleaning properties or shark skin for reduced friction. While numerous technical and theoretical improvements have been demonstrated, strategies for process monitoring are yet to be implemented in DLIP, for instance aiming to treat complex and non-plane surfaces. Over the last 35 years, it has been shown that the sound pressure generated by a laser beam hitting a surface and producing ablation can be detected and analysed using simple and commercially available transducers and microphones. This work describes the detection and analysis of photo-acoustic signals acquired from airborne acoustic emission during DLIP as a direct result of the laser–material interaction. The study includes the characterization of the acoustic emission during the fabrication of line-like micro textures with different spatial periods and depths, the interpretation the spectral signatures deriving from single spot and interference ablation, as well as a detailed investigation of the vertical extent of the interference effect based on the ablated area and its variation with the interference period. The results show the possibility to develop an autofocusing system using only the signals from the acoustic emission for 3D processing, as well as the possibility to predict deviations in the DLIP processing parameters.

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Fast Laser Cutting of Thin Metal

Cited by 17 publications

References 5 publications

The Effect of the Laser Incidence Angle in the Surface of L-PBF Processed Parts

The Effect of the Laser Incidence Angle in the Surface of L-PBF Processed Parts

Progresses on the Use of Two-Photon Absorption Laser Induced Fluorescence (TALIF) Diagnostics for Measuring Absolute Atomic Densities in Plasmas and Flames

Detection and analysis of photo-acoustic emission in Direct Laser Interference Patterning

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