Real-time monitoring of high-power fibre-laser cutting for different types of materials

Abstract

Changes in gas pressure or cutting-head focus, as well as material warming can usually occur during metals processing, thus imposing insufficient quality of the resulting materials. These problems imply quality deterioration for both laser welding and laser cutting and cause the losses in terms of both time and cost. The primary aim of the present study is to solve these problems with special software. We discuss the effects of laser power, nozzle type, cutting speed and assisting-gas pressure on the quality characteristics of cut materials. Piercing and cutting processes are experimentally performed on the samples of stainless steel, aluminium and mild steel with the thicknesses 8, 12 and 20 mm, respectively. For each of these materials, we determine experimentally 'decision times' and analogvoltage thresholds corresponding to the material-surface temperature or the light intensity and then incorporate these parameters into the algorithm. The tests have demonstrated that our monitoring-based system is more successful than the standard metals-processing systems.

The development trend and academic patent technology network of laser and optical technologies

“…In terms of theoretical contributions, most of the existing studies have focused on discussions on the technical Dong et al (2020), Qin et al (2020) or research in the application aspects (Abramov et al, 2018;Hajjarian and Nadkarni, 2020;Karanfil and Yalçin, 2019). However, these studies were unable to highlight the focus and development trends of laser and optical technology domains from a macro level perspective.…”

“…For example, high-power fiber laser technology has started emerging in the early twenty-first century; it offers superior functionality. It has become an application focus in the laser industry in the early twenty-first century (Abramov et al, 2018;Karanfil and Yalçin, 2019). Additionally, the advancement of semiconductor laser technologies propels the flourishing development of the optical fiber communication industry; diode-pumped erbium-doped single-mode fiber technology can amplify optical signals.…”

“…The application scope of laser and optical technologies is fairly extensive; it includes optics, semiconductors, communications, materials, medicine and chemistry. However, the majority of the existing studies have focused on discussions on the technical aspects Dong et al (2020), Qin et al (2020) or research in the application aspects (Abramov et al, 2018;Hajjarian and Nadkarni, 2020;Karanfil and Yalçin, 2019), these studies have not highlighted the technology distribution and application development of laser and optical technologies from a macro perspective. Additionally, the existing studies have rarely discussed the technology trends of laser and optical technologies from an academic perspective.…”

Generalisierung eines maschinellen Lernmodells für das Laserschneiden auf verschiedenen Blechdicken/Generalising a machine learning model for laser cutting on various sheet thicknesses

“…Dazu werden in [6][7][8] visuelle Sensorsignale (Photodioden oder Kamerabilder) verwendet, welche die Eingabedaten für das Trainieren Neuronaler Netze bereitstellen. Die Laserschneidmaschine ist eine vielseitige Werkzeugmaschine [10]. Das bedeutet, dass auf einer Maschine verschiedene Prozesse geschnitten werden können.…”

Analysis of Photodiode Monitoring in Laser Cutting

“…Finally, to increase knowledge in the field of laser cutting, investigations have been carried out to correlate the monitoring signals with variations in the cutting parameters, such as laser power, process gas pressure, cutting velocity, or gas flow rate. Long et al [23] studied the transient regime of the temperatures in the laser cutting process of steel plates and Karanfil and Yalçin [24] presented a real-time monitoring system for cutting different materials. Those studies only display results when bad quality in the cutting process is observed, concluding that the signals are strongly connected to the cut quality.…”