141. Fatigue Strengh of Welded Wrought Magnesium Alloys

  1. Prof. Dr. K. U. Kainer
  1. B. Kleinpeter,
  2. M. Rethmeier,
  3. H. Wohlfahrt and
  4. K. Dilger

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch141

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

Kleinpeter, B., Rethmeier, M., Wohlfahrt, H. and Dilger, K. (2003) Fatigue Strengh of Welded Wrought Magnesium Alloys, 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.ch141

Editor Information

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

Author Information

  1. Institute for Joining and Welding, Langer Kamp 8, 38106 Braunschweig, Germany

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:

  • magnesium alloys;
  • MIG-welding;
  • heat input;
  • drop detachment;
  • fatigue behavior;
  • laser;
  • electron beam

Summary

For an increasing use of magnesium alloys a better knowledge of the welding processes and especially the reachable fatigue strength of the welded joints is needed. Comparative investigations with MIG, laser beam (with and without filler metal) and electron beam welding were carried out regarding especially the weldability and the fatigue strength of the welded joints. 2.7 mm thick extruded profiles of AZ61 were used. Great progress in the matter of spatter formation and therefore process stability could be achieved by MIG welding with special welding power source characteristics. The gap between short-circuiting- and spray-arc-transfer could be closed by the triggered short-circuiting-arc. In comparison to MIG welding laser beam welding of magnesium alloys is uncomplicated. Difficulties mainly occur when filler metal is used. Good welding results depend on the feeding of the filler metal. The arrangement of the laser beam, filler metal and base metal is thereby of crucial importance. Concerning the weldability of magnesium alloys no differences between laser beam and electron beam could be observed. Nevertheless distinctions in the weld geometry and consequently the fatigue strength appeared. Depending on the profiles of the weld seams, the highest fatigue strength (55% of the base metal strength) could be reached with electron beam welding without and laser beam welding with filler metal. For laser beam welding without filler metal and MIG welding the fatigue strength decreased to 50%, whereas tests with removed weld reinforcements showed a fatigue strength of 75% of the base metal strength.