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Laser beam welding of magnesium to coated high-strength steel 22MnB5

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Abstract

Magnesium alloy AZ31 was laser-welded to AlSi10Fe3-coated high-strength steel 22MnB5. The surface of the 22MnB5 steel sheet was treated by sandblasting before welding. Laser welding of magnesium with steel was found to be a welding-brazing process, due to the large difference in the melting temperatures of steel and magnesium. The liquid magnesium was wetted on the solid steel surface, which thus was a brazing process on the steel side. AZ61 magnesium welding filler was used to improve adhesion of the liquid magnesium to the steel surface. Furthermore, the suitability of using a flux was determined. Welded steel/magnesium joints with a high tensile strength of 2680–3090 N (178–213 MPa) were produced using a flux and inductive preheating of the conditioned steel surface. Under tensile loading, the welded joints did not fail at the steel/magnesium interface, but in the AZ61 magnesium welding filler. Metallurgical bonding at the magnesium/steel interface was attributed to the formation of a thin Al-Fe-rich layer, which is due to the alloyed aluminum (6 mass%) in the magnesium welding filler.

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Authors and Affiliations

  1. Lehrstuhl Werkstofftechnik, Ruhr-Universität Bochum, Gebäude ICFO 03-313, Universitätsstraße 150, 44801, Bochum, Germany

    M. Windmann, A. Röttger & W. Theisen

  2. BIAS - Bremer Institut für angewandte Strahltechnik GmbH, Klagenfurter Str. 2, 28359, Bremen, Germany

    H. Kügler

Authors
  1. M. Windmann
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  2. A. Röttger
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  3. H. Kügler
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  4. W. Theisen
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Correspondence to M. Windmann.

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Windmann, M., Röttger, A., Kügler, H. et al. Laser beam welding of magnesium to coated high-strength steel 22MnB5. Int J Adv Manuf Technol 87, 3149–3156 (2016). https://doi.org/10.1007/s00170-016-8682-5

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  • DOI: https://doi.org/10.1007/s00170-016-8682-5

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