Alternative Methods to Increase the Long Term Performance of Laser-Welded Copper Aluminum Connections for Electronic Applications in Mobile Systems
Weigl M, Albert F, Schmidt M (2011)
Publication Type: Conference contribution
Publication year: 2011
Original Authors: M. Weigl, F. Albert, M. Schmidt
Series: Sustainable Automotive Technologies
Pages Range: 39-47
Conference Proceedings Title: Sustainable Automotive Technologies 2011 Proceedings of the 3rd International Conference
Event location: Greenville
ISBN: 9783642190520
DOI: 10.1007/978-3-642-19053-7_6
Abstract
or the realization of modern drive concepts based on high power electronics, it is necessary to take the advantages of well-adapted materials for the respective challenges. In terms of high power electronics, mainly in the range of energy storage and distribution, the substitution of copper by aluminum seems to be adequate to reduce the mass of the overall mobile system and to lower the production costs. However, for electrical reasons a complete replacement of copper is not practicable, therefore it is necessary to contact copper and aluminum by way of metal continuity. In order to reach high operating temperatures as well as an excellent electric conductivity copper and aluminum are supposed to be joined by welding processes. For this purpose especially laser welding is a suitable technique to realize defined energy inputs, high operating speeds and good automation facilities. Nevertheless the joining of copper and aluminum by means of laser-welding causes miscellaneous difficulties. Besides worse absorption factors for the typical industrial laser wavelengths, copper and aluminum form a lot of intermetallic CuAl phases. Most of these phases feature high hardness values, coming along with a distinctive brittleness and effectuate minor ductility values. In this context, the present article deals with an alternative method for the laser-welding of Cu-Al connections, which avoids a direct interaction of copper and aluminum in the molten state. For this purpose, so-called roll-cladded inserts are used, in order to split one direct Cu-Al connection into two separate joints, i. e. Al-Al and Cu-Cu. The rather Cu-Al connection is transferred to the standardized roll-cladding process, whereby high-grade connections at dissimilar materials, which would form various intermetallic phases at fusion welding, are achievable
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APA:
Weigl, M., Albert, F., & Schmidt, M. (2011). Alternative Methods to Increase the Long Term Performance of Laser-Welded Copper Aluminum Connections for Electronic Applications in Mobile Systems. In Sustainable Automotive Technologies 2011 Proceedings of the 3rd International Conference (pp. 39-47). Greenville, US.
MLA:
Weigl, Markus, Florian Albert, and Michael Schmidt. "Alternative Methods to Increase the Long Term Performance of Laser-Welded Copper Aluminum Connections for Electronic Applications in Mobile Systems." Proceedings of the Sustainable Automotive Technologies 2011 Proceedings of the 3rd International Conference, Greenville 2011. 39-47.
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