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Correlation of Optical Signal During Laser Fusion Welding of Copper to Aluminum
Mathivanan, Karthik; Plapper, Peter
2021In Journal of Laser Applications, 33 (1)
Peer reviewed
 

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Keywords :
Laser welding; Al-Cu weld; welding signal; plasma plume; Intermetallic phases
Abstract :
[en] Laser joining of dissimilar metals, copper and aluminum, allows for the precise delivery of laser energy and high process speed. The keyhole-based process is very efficient for welding Al–Cu, considering the high reflectivity and thermal conductivity of the materials joined. For the Al–Cu system, the formation of detrimental intermetallic compounds is the main issue. Fusion welding with laser as a heat source involves the melting of metals. However, the high speed of the laser welding process is advantageous for terminating the excessive melting of Al and Cu and eventually controlling the detrimental intermetallic phases. Therefore, information pertaining to melted material is an important criterion for achieving joint strength. In this paper, the photodiode signal measured during the laser welding of Cu to Al is investigated as a process monitoring technique. In welding from Cu to Al, the melting of Al (bottom sheet) is very critical for joint strength. The amount of Al material that can be intermixed in Cu depends on the solubility limit of the Al–Cu system. The plasma plume emission during laser welding is used to extract the rapid melting of Al. This study shows the correlation of the Al characteristic peak at a wavelength of 396 nm with the shear strength of the joint.
Disciplines :
Mechanical engineering
Author, co-author :
Mathivanan, Karthik ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)
Plapper, Peter ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)
External co-authors :
no
Language :
English
Title :
Correlation of Optical Signal During Laser Fusion Welding of Copper to Aluminum
Publication date :
05 January 2021
Event name :
Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2020
Event organizer :
Laser Institute of America
Event date :
18-10-2020 to 21-10-2020
Audience :
International
Journal title :
Journal of Laser Applications
Special issue title :
Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2020
Volume :
33
Issue :
1
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
Funders :
FEDER - Fonds Européen de Développement Régional [BE]
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since 01 February 2021

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