Improved manufacturing processes with high power lasers

Leidinger, Doris; Penz, Andreas; Schuöcker, D.

doi:10.1016/1350-4495(94)00070-2

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…Phenomena such as light reflection and absorption, heat conduction, enable better adequacy of the production process and the choice of material to be worked, influence the laser process, which is related to optical and thermal properties, and not to the mechanical proprieties [4] .…”

Section: Theoretical Foundationmentioning

confidence: 99%

Analysis of Autogenous Laser Welding in Low Carbon and Large Thickness Steel

Kohls

Bohórquez

Gemilli

et al. 2021

j. of mech. eng. res.

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With the use of laser welding, it is possible to join different steel, with different thicknesses, with or without the action of protective layers. The quality of laser radiation makes it possible to get certain characteristics that are impossible to get by other processes, such as high welding speeds, less metallurgical effects suffered by the heat-affected zone (ZAC), and this process also does not require filler metal, therefore it is free from possible contamination. Combined with traditional welding methods, laser welding produces narrower weld beads, allowing for better prevention of corrosion and thermal distortions. Although the process already has high industrial knowledge, some random defects, such as porosities and inconsistencies, are still found. This work presents a systematic study to determine the influence of laser welding parameters and how these parameters influence welding defects. For this, the experimental part was carried out in the welding laboratory - LABSOLDA, of the Federal University of Santa Catarina - UFSC, during the laser welding processes, a welding speed of 2.4 m/min was reached. For this experiment, argon was used as a shielding gas and 1020 steel was used as the base material.

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Section: Theoretical Foundationmentioning

confidence: 99%

Analysis of Autogenous Laser Welding in Low Carbon and Large Thickness Steel

Kohls

Bohórquez

Gemilli

et al. 2021

j. of mech. eng. res.

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“…Man et al [44] observed that a higher amount of gas penetrates into the kerf as compared to the processing assisted by converging nozzles. Leidinger et al [73] showed that pressure distribution and Mach number on the workpiece were insensitive to stand-off variations when a de Laval nozzle is used.…”

Section: Proposals To Avoid Unsuitable Aerodynamic Interactionsmentioning

confidence: 99%

Laser Cutting: A Review on the Influence of Assist Gas

et al. 2019

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Assist gas plays a central role in laser fusion cutting. In this work, the aerodynamic interactions between the assist gas and the workpiece are reviewed. An insight into those phenomena that hinder the cutting quality and performance is provided. These phenomena include shock waves, choking, boundary layer separation, etc. The most relevant and promising attempts to overcome these common problems related to the gas dynamics are surveyed. The review of the current scientific literature has revealed some gaps in the current knowledge of the role of the assist gas dynamics in laser cutting. The assist gas interactions have been investigated only under static conditions; and the dynamic interaction with the molten material on the cutting front has not been addressed. New nozzle designs with improved efficiency of molten material removal are required to improve cut quality; and cutting speed in current industrial laser cutting machines; especially in those assisted by new high-brightness laser sources.

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“…[7][8][9] Laser machining using the near infrared (1064 nm) to ultraviolet (UV, 248 nm) spectrum is used for precision micrometre range machining. 10,11 Using patterns on polymers, ceramics and superconductors ablated by excimer lasers produced structures with less material damage. 12 Polymeric materials are suitable for microstructures owing to their low ablation threshold, smooth etching behaviour and ablation rates at tenths of micrometres per pulse at very modest energy fluence.…”

Section: Introductionmentioning

confidence: 99%

PET polymer ablation using excimer laser for nozzle plate application

Pan¹,

Yang²,

Wei³

et al. 2007

Materials Science and Technology

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Polyethylene terephthalate (PET) film drilling using a 248 nm excimer laser through photomask projection is presented. The parameter effects of laser fluence, shot number and repetition rate on the processing results are examined. A high quality microhole array with 50 mu m thick PET film is fabricated. When the projection process is carried out, the diameter differences in the microhole in the front and back side of PET are observed. This causes a conical shape in the kerf. The formation of this conical shape in terms of the laser process parameters is discussed. The process parameter effects are investigated and characterised to improve the PET microhole laser machining quality

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Improved manufacturing processes with high power lasers

Cited by 16 publications

References 5 publications

Analysis of Autogenous Laser Welding in Low Carbon and Large Thickness Steel

Analysis of Autogenous Laser Welding in Low Carbon and Large Thickness Steel

Laser Cutting: A Review on the Influence of Assist Gas

PET polymer ablation using excimer laser for nozzle plate application

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