Process control in pulsed laser welding of electronics
Schmidt M (2002)
Publication Type: Conference contribution
Publication year: 2002
Publisher: Laser Institute of America
Conference Proceedings Title: ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Event location: USA
ISBN: 0912035722
DOI: 10.2351/1.5065629
Abstract
A growing number of today's applications uses decentralized electronics. Especially automotive, aviation and aerospace industry require high temperature resistant electro-mechanical contacts for sensors or actuators working in harsh environment. These interconnects are often realized via laser spot welding, a joining method offering a high automation and miniaturization potential. The materials used are copper and its alloys as they allow a high electrical conductivity. Welding these materials unfortunately offers narrow process windows due to high thermal conductivity and reflectivity. According to the joining geometry, a lot of applications cannot be realized yet because of a poor reproducibility of weld quality. Using detectors to observe the joining area before and during the spot weld enables different control strategies to influence e.g. in real-time, pulse power, pulse duration and focal position before or during the pulse. The article gives an overview over the best suited sensing techniques and presents a multi sensor system already tested in industrial use. Suitable algorithms for processing sensor data will be presented beginning with feature extraction of time series, different transformations up to statistical process modeling. The capabilities of selected algorithms for quality assurance will be shown in experimental results. The status of process control in laser spot welding of electronics will be discussed and summarized; an outlook to automated process control systems will conclude the article.
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Germany (DE)How to cite
APA:
Schmidt, M. (2002). Process control in pulsed laser welding of electronics. In ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings. USA: Laser Institute of America.
MLA:
Schmidt, Michael. "Process control in pulsed laser welding of electronics." Proceedings of the ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, USA Laser Institute of America, 2002.
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