135. Welding of Magnesium Alloy AZ91C by CO2 Laser and by Friction Stir Welding

  1. Prof. Dr. K. U. Kainer
  1. P. Volovitch1,
  2. M. Dhahri1,
  3. J.-E. Masse1,
  4. L. Barrallier1,
  5. T. Baudin2,
  6. B. DaCosta3 and
  7. J.C. Goussain3

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch135

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

How to Cite

Volovitch, P., Dhahri, M., Masse, J.-E., Barrallier, L., Baudin, T., DaCosta, B. and Goussain, J.C. (2005) Welding of Magnesium Alloy AZ91C by CO2 Laser and by Friction Stir Welding, in Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603565.ch135

Editor Information

  1. GKSS-Forschungszentrum, Institut für Werkstoffforschung, Max-Planck-Straße, 21502 Geesthacht, Germany

Author Information

  1. 1

    MécaSurf ENSAM, Aix en Provence, France

  2. 2

    Université Paris-Sud, Orsay, France

  3. 3

    Institut de Soudure, Yutz, France

Publication History

  1. Published Online: 22 APR 2005
  2. Published Print: 27 NOV 2003

ISBN Information

Print ISBN: 9783527309757

Online ISBN: 9783527603565

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Keywords:

  • welding;
  • magnesium alloy AZ91C;
  • CO2 Laser;
  • friction stir welding

Summary

AZ91 is one of the most widely used magnesium-aluminum-zinc cast alloys. Due to the difficulties of traditional welding techniques for magnesium alloys, such as the high thermal expansion coefficient, the absence of color change with temperature approaching the melting point, the presence of magnesium oxide surface layer, etc., the only manufacturing process widely used in industry for the welding of magnesium cast alloys is Gas Tungsten Arc Welding technique. The problems of porosity and weldment deformation remain unsolved and the study of other joining processes is needed. Among the high energy density welding techniques for magnesium alloys is the laser welding [1]. For thin foil materials laser CO2 welding seems to be promising [2]. The high welding speed (2-6 m/min) can be useful for commercial applications. However, this process is energy-consuming (3.1 kJ/mm of joining [3]). Another great problem of laser welding especially for long objects is the surface preparation. The development of friction stir welding (FSW) is expected to solve these problems. The oxide layer is removed during the tool passage; the energy required is 5 times lower (0.3 kJ/mm of joining [3]). FSW seems to be suitable for the welding of magnesium cast alloys [4, 5]. The present study deals with application of laser CO2 and FSW to the AZ91C alloy. The good welding parameters are experimentally defined for both laser and FS welding. The structural and mechanical characterization of the weld zone is performed; the role of the thermal treatment on the weld properties is discussed.