A1 Refereed original research article in a scientific journal

Embedded processing methods for on-line visual analysis of laser welding




AuthorsOlli Lahdenoja, Tero Säntti, Jonne K. Poikonen, Mika Laiho, Ari Paasio, Joonas Pekkarinen, Antti Salminen

PublisherSPRINGER HEIDELBERG

Publication year2019

JournalJournal of Real-Time Image Processing

Journal name in sourceJOURNAL OF REAL-TIME IMAGE PROCESSING

Journal acronymJ REAL-TIME IMAGE PR

Volume16

Issue4

First page 1099

Last page1116

Number of pages18

ISSN1861-8200

DOIhttps://doi.org/10.1007/s11554-016-0605-z(external)


Abstract
Online monitoring and closed-loop control of laser welding offer great possibilities for achieving better weld quality. Earlier work on visual laser welding monitoring has mainly focused on aluminum and fairly thin steel used, for example, in car production. We extend this work by focusing on the automated analysis of the phenomena present in the laser welding of thick steel, where all of the phenomena related to the weld quality are still not well understood or controlled. This paper presents the implementation, test results and analysis for weld monitoring methods implemented on a compact smart camera system. The applied embedded sensor-processor platform allows for high-speed implementation of image capture and dynamic range compression, real-time seam tracking and spatter feature extraction. The paper describes experimental results from implemented real-time algorithms for seam tracking and spatter extraction and additional off-line analysis of methods for spatter tracking and seam widening detection, which are also feasible for future online hardware implementation. The results suggest that it is possible to integrate a compact laser welding analysis system, which achieves analysis rates that are sufficient for real-time process control.



Last updated on 2024-26-11 at 18:09