Advanced Laser Machining Technology

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 1901

Special Issue Editor


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Guest Editor
College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410006, China
Interests: laser machining; ultra-short pulse laser; laser sensors; optical measurement

Special Issue Information

Dear Colleagues,

Laser machining has been regarded as an ideal method for cutting difficult-to-machine materials or fabricating micro/nanostructures with specific shapes and performances. Although many researchers have contributed to this phenomenon or theory during laser machining, there is still a large amount of information to be provided or discussed in detail, especially in the field of ultrashort pulse laser processing, with the emergence of a large number of new materials. The current knowledge of the interaction of the mechanism of lasers and materials is still quite limited. Some phenomena or conclusions need to be elucidated or verified by new models or experiments. New methods need to be provided to resolve or improve the many existing processing problems, such as different kinds of ablation defects.

This Special Issue aims to collect the innovative work of laser machining and corresponding applications to highlight the current and future developments in the field. Both original research and review articles summarizing the state of the art of theoretical or experimental work concerning advanced laser machining technology are welcome. Topics of particular interest include, but are not limited to, the use of numerical modeling to optimize processing performance or novel experimental methods, or the application of laser machining on new materials or in new fields.

Dr. Mingquan Li
Guest Editor

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Keywords

  • laser machining
  • ultra-short pulse laser
  • long-pulse laser
  • processing mechanism
  • laser sensor and measurement
  • difficult-machining material
  • micro-nano fabrication

Published Papers (2 papers)

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Research

17 pages, 7430 KiB  
Article
Temporal Resolution of Acoustic Process Emissions for Monitoring Joint Gap Formation in Laser Beam Butt Welding
by Sayako Kodera, Leander Schmidt, Florian Römer, Klaus Schricker, Saichand Gourishetti, David Böttger, Tanja Krüger, András Kátai, Benjamin Straß, Bernd Wolter and Jean Pierre Bergmann
Appl. Sci. 2023, 13(18), 10548; https://doi.org/10.3390/app131810548 - 21 Sep 2023
Viewed by 938
Abstract
With the increasing power and speed of laser welding, in-process monitoring has become even more crucial to ensure process stability and weld quality. Due to its low cost and installation flexibility, acoustic process monitoring is a promising method and has demonstrated its effectiveness. [...] Read more.
With the increasing power and speed of laser welding, in-process monitoring has become even more crucial to ensure process stability and weld quality. Due to its low cost and installation flexibility, acoustic process monitoring is a promising method and has demonstrated its effectiveness. Although its feasibility has been the focus of existing studies, the temporal resolution of acoustic emissions (AE) has not yet been addressed despite its utmost importance for realizing real-time systems. Aiming to provide a benchmark for further development, this study investigates the relationship between duration and informativeness of AE signals during high-power (3.5 kW) and high-speed (12 m/min) laser beam butt welding. Specifically, the informativeness of AE signals is evaluated based on the accuracy of detecting and quantifying joint gaps for various time windows of signals, yielding numerical comparison. The obtained results show that signals can be shortened up to a certain point without sacrificing their informativeness, encouraging the optimization of the signal duration. Our results also suggest that large gaps (>0.3mm) induce unique signal characteristics in AE, which are clearly identifiable from 1 ms signal segments, equivalent to 0.2mm weld seam. Full article
(This article belongs to the Special Issue Advanced Laser Machining Technology)
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10 pages, 4766 KiB  
Article
A General Analytical Solution for Two-Dimensional Columnar Crystal Growth during Laser Beam Welding of Thin Steel Sheets
by Antoni Artinov, Victor Karkhin, Xiangmeng Meng, Marcel Bachmann and Michael Rethmeier
Appl. Sci. 2023, 13(10), 6249; https://doi.org/10.3390/app13106249 - 19 May 2023
Viewed by 728
Abstract
A technique for calculating the main solidification parameters for a two-dimensional columnar crystal growth during complete penetration laser beam welding of thin steel sheets was developed. Given that the weld pool interface is described by Lamé curves (superellipses) within the horizontal plane of [...] Read more.
A technique for calculating the main solidification parameters for a two-dimensional columnar crystal growth during complete penetration laser beam welding of thin steel sheets was developed. Given that the weld pool interface is described by Lamé curves (superellipses) within the horizontal plane of growth, general analytical solutions were derived for the geometry of the crystal axis and the corresponding growth rate and cross-sectional area of the crystal. A dimensionless analysis was performed to provide insights on the dependence of the solidification parameters on the shape and dimensions of the rear part of the weld pool boundary. The derived solutions were applied for the case of complete penetration laser beam keyhole welding of 2 mm thick 316L austenitic chromium-nickel steel sheets. It was shown that the reconstruction of the weld pool boundary with Lamé curves provides higher accuracy and flexibility compared to results obtained with elliptical functions. The validity of the proposed technique and the derived analytical solutions was backed up by a comparison of the obtained solutions to known analytical solutions and experimentally determined shapes and sizes of the crystals on the top surface of the sheet. The dimensions of the calculated crystal axis correlated well with the experimentally obtained results. Full article
(This article belongs to the Special Issue Advanced Laser Machining Technology)
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