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Automated weld seam evaluation and 2D simulation parameter calibration for absorber-free laser transmission welding

  • Absorber-free laser transmission welding enables clean and precise joining of plastics without additives or adhesives. It is therefore well suited to produce optical and medical devices, which place high demands on cleanliness and accuracy. However, the weld usually has an undesirably large vertical expansion, causing bulges and distortion. To improve this, the intensity distribution of the laser beam as well as the processing strategy must be adapted. Due to the complexity, this is aided by process simulation. However, simulation parameter calibration and verification are usually done considering the seam width and height, which is of limited significance. To overcome this, we propose a new method for image processing of microtome sections, determining the spatially resolved geometry of the weld. Thus, the deviation between experiment and simulation can be calculated pixel by pixel. This spatially resolved value is predestined for the calibration of the simulation parameters: For a parameter field with 18 different settings, the total deviation between experiment and simulation is less than 11 % after calibration.

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Metadaten
Author:Frederik MaiwaldORCiD, Johannes Tröger, Stefan HierlGND
URL / DOI:https://www.wlt.de/sites/default/files/2023-09/Contribution_122.pdf
Parent Title (English):Lasers in Manufacturing Conference (LIM 2023), 26. Juni bis 29. Juni 2023, München
Publisher:Wissenschaftliche Gesellschaft Lasertechnik und Photonik e.V. (WLT)
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2023
Release Date:2023/10/13
Tag:image processing; optimization; plastics welding; simulation
Pagenumber:10
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Laser-Materialbearbeitung (LMP)
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG