Mr. Mitja Schimek Profile

Mitja Schimek

at Laser Zentrum Hannover eV

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Proceedings Article | 22 February 2013 Paper

Laser welding of dissimilar materials for lightweight construction and special applications

Mitja Schimek, André Springer, Ronny Pfeifer, Stefan Kaierle

Proceedings Volume 8603, 86030J (2013) https://doi.org/10.1117/12.2006335

KEYWORDS: Aluminum, Laser welding, Laser processing, Solar energy, Iron, Copper, Signal processing, Solar processes, Laser applications, Head

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Against the background of climate objectives and the desired reduction of CO₂-emissions, optimization of existing industrial products is needed. To counter rising raw material costs, currently used materials are substituted. This will places new requirements on joining technologies for dissimilar material classes. The main difficulty lies in joining these materials cohesively without changing the properties of the base materials. Current research work at the LZH on joining dissimilar materials is being carried out for the automotive sector and for solar absorbers. For the automotive industry, a laser welding process for joining steel and aluminum without using additives is being investigated, equipped with a spectroscopic welding depth control to increase tensile strength. With a specially constructed laser processing head, it is possible to regulate welding penetration depth in the aluminum sheet, reducing the formation of intermetallic phases. Flat plate solar collectors are favorable devices for generating heat from solar energy. The solar absorber is the central part of a collector, consisting of an aluminum sheet and a copper tube which is attached to the aluminum sheet. Research on new laser welding processes aims at reducing the amount of energy required for production of these solar absorbers. In the field of joining dissimilar materials, laser joining processes, especially for special applications, will complement established joining techniques.

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