Local Vaporization at the Cut Front at High Laser Cutting Speeds

Bocksrocker, Oliver; Berger, Peter; Keßler, Steffen; Hesse, Tim; Rominger, Volker; Graf, Thomas

doi:10.1007/s40516-020-00113-3

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…It was demonstrated that this BOS setup can also be used for the observation of evaporation processes, which play an important role in laser cutting. The proposed observation technique could be helpful for the investigation of evaporation effects in classical laser fusion cutting using a gas nozzle [ 13 ], or in related processes such as laser remote fusion cutting, which is driven by evaporation phenomena [ 14 ]. In [ 13 ], the influence of vaporization on the striation pattern is inferred from the experiments, which needs further investigation.…”

Section: Discussionmentioning

confidence: 99%

Shedding Light on Gas-Dynamic Effects in Laser Beam Fusion Cutting: The Potential of Background-Oriented Schlieren Imaging (BOS)

Burger

Schwarzkopf²,

Klämpfl³

et al. 2023

Sensors

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In laser beam fusion cutting of metals, the interaction of the gas jet with the melt determines the dynamics of the melt extrusion and the quality of the resulting cutting kerf. The gas-dynamic phenomena occurring during laser beam cutting are not fully known, especially regarding temporal fluctuations in the gas jet. The observation of gas and melt dynamics is difficult because the gas flow is not directly visible in video recordings and access to the process zone for observation is limited. In this study, the problem of imaging the gas jet from the cutting nozzle is addressed in a novel way by utilizing the striation pattern formed at the cutting kerf as a background pattern for background-oriented Schlieren imaging (BOS). In this first feasibility study, jets of different gas nozzles were observed in front of a solidified cutting kerf, which served as a background pattern for imaging. The results show that imaging of the characteristic shock diamonds of cutting nozzles is possible. Furthermore, the resulting shock fronts from an interaction of the gas jet with a model of a cutting front can be observed. The possibility of high-speed BOS with the proposed method is shown, which could be suitable to extend the knowledge of gas-dynamic phenomena in laser beam fusion cutting.

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Section: Discussionmentioning

confidence: 99%

Shedding Light on Gas-Dynamic Effects in Laser Beam Fusion Cutting: The Potential of Background-Oriented Schlieren Imaging (BOS)

Burger

Schwarzkopf²,

Klämpfl³

et al. 2023

Sensors

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show abstract

“…Therefore, a high number of cross-sections per cut have to be performed to gain reliable results. Observing the melt flow is common to draw conclusions about the cutting result [21,22,[26][27][28][29][30][31]. Due to the limited accessibility of the process zone, artificial conditions have been created for process observation [21,27,28] or complex experimental setups have been designed [21,22,[27][28][29][30], which are not suitable as standard evaluation.…”

Section: Measurement Methods To Determine the Limiting Mechanisms Of ...mentioning

confidence: 99%

Understanding the Changed Mechanisms of Laser Beam Fusion Cutting by Applying Beam Oscillation, Based on Thermographic Analysis

Pinder

Goppold

2021

Applied Sciences

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The latest research on applying beam oscillation in laser beam fusion cutting revealed significant process improvements regarding speed and quality. The reason for this increasing process efficiency remains unexplained; however, theoretical investigations suggest the change in energy deposition (respectively heat conduction) as the cause. The present paper aims to analyze the energy deposition by a novel temperature measurement method. For this purpose, a conventional laser beam cutting setup was equipped with beam oscillation technology and a high-speed temperature measurement setup. Various characteristics of the temperature distribution in the process zone (spatial and temporal resolved temperature profiles, maximum and average values, as well as melt pool size) were evaluated for different conditions of beam oscillation (amplitude, frequency, cutting speed). Additionally, the geometrical properties of the process zone, defining the absorptivity have been measured. The comparison with static beam shaping reveals strong temperature volatility, which is induced by the way of energy deposition and an improved absorptivity over a substantial part of the cut front, with the overall result of enhanced heat conduction. For the first time, changed mechanisms applying beam oscillation instead of static beam shaping have been experimentally identified. Based on these measurements, a previously developed explanatory model was not only confirmed but also extended.

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The 3D surface morphological investigation of laser cutting process of 2024-T3 aluminum alloy sheet

Çavuşoğlu

2021

Optik

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Local Vaporization at the Cut Front at High Laser Cutting Speeds

Cited by 11 publications

References 15 publications

Shedding Light on Gas-Dynamic Effects in Laser Beam Fusion Cutting: The Potential of Background-Oriented Schlieren Imaging (BOS)

Shedding Light on Gas-Dynamic Effects in Laser Beam Fusion Cutting: The Potential of Background-Oriented Schlieren Imaging (BOS)

Understanding the Changed Mechanisms of Laser Beam Fusion Cutting by Applying Beam Oscillation, Based on Thermographic Analysis

The 3D surface morphological investigation of laser cutting process of 2024-T3 aluminum alloy sheet

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