Laser welding is becoming more and more important in automotive industry and quality of the weld is critical for a successful application. In many cases the increase in welding speed provided by laser welding has caused the welding system operator to be unable to keep up with the production rate while inspecting each part. Therefore, real time on-line inspection of the weld must be provided. To address this need, in the last years a number of on-line inspection systems, have being developed to improve weld quality and reduce overall costs. The weakness of these systems is however represented by the poor signal analysis methods, adopted to get information about the condition of the weld. In this paper we explore the time-frequency distributions with rotated kernel, to extract information from signals detected during the laser welding process. The proposed method yields significantly improved components localization. We briefly recall the fundamental concepts of the theory of time-frequency representations, after that we describe the rotation of the kernel through the fractional Fourier transform. Finally we compare the proposed time-frequency distributions by analyzing signals detected during the laser welding, demonstrating the advantages of the proposed method, giving practical applicability to the proposed method.
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ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing
October 20–23, 2008
Temecula, California, USA
ISBN:
978-0-912035-12-3
PROCEEDINGS PAPER
Studying the quality of laser welding process using time-frequency distributions with rotated kernel
Giuseppe D’Angelo
Giuseppe D’Angelo
Quality, Costs & Logistic Departement, Fiat Research Centre
Strada Torino 50, 10043 - Orbassano, Italy
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Published Online:
October 01 2008
Citation
Giuseppe D’Angelo; October 20–23, 2008. "Studying the quality of laser welding process using time-frequency distributions with rotated kernel." Proceedings of the ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Temecula, California, USA. (pp. 1704). ASME. https://doi.org/10.2351/1.5061266
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