Influences on the Static and Dynamic Strength of MIG-welded Magnesium Alloys

  1. Prof. Dr.-Ing. K. U. Kainer
  1. M. Rethmeier,
  2. S. Wiesner and
  3. H. Wohlfahrt

Published Online: 15 MAY 2006

DOI: 10.1002/3527607552.ch31

Magnesium Alloys and their Applications

Magnesium Alloys and their Applications

How to Cite

Rethmeier, M., Wiesner, S. and Wohlfahrt, H. (2006) Influences on the Static and Dynamic Strength of MIG-welded Magnesium Alloys, in Magnesium Alloys and their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607552.ch31

Editor Information

  1. GKSS-Forschungszentrum Geesthacht GmbH, Institut für Werkstofforschung, Max-Planck- Straße, D-21502 Geesthacht, Germany

Author Information

  1. Welding Institute, Technical University, Braunschweig, Germany

Publication History

  1. Published Online: 15 MAY 2006
  2. Published Print: 20 SEP 2000

ISBN Information

Print ISBN: 9783527302826

Online ISBN: 9783527607556

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Keywords:

  • MIG-welded magnesium alloys;
  • static;
  • dynamic strength;
  • magnesium alloys;
  • joining

Summary

During the last years, enormous progress has been made in the fields of welding power sources and filler materials for the MIG-welding of magnesium alloys. This progress has lead to an essentially improved welding process and, therefore, to welding results of an extraordinary quality. A decisive demand of the welding process is the energy input into the filler material. Problems that may appear in this process are a result of the physical properties of magnesium (melting point 600 °C, vaporization point 1100 °C). The energy input into the filler material must be regulated in such a way that the wire melts but does not vaporize. For this reason, specific characteristics of power sources have been examined. An important improvement of the weld seam profile has been achieved by using filler material of only 1.2 mm in diameter which has been in use since the end of 1999. Furthermore, experiments have been made with 2.5 mm thick extruded profiles of AZ31 and AZ61. The results of the static testing show strengths of 80 to 100 % of the base metal. Bending angles up to 60° have been reached. The fatigue strength under reversed bending of the examined magnesium alloys after welding reaches 50 % of the strength of the base metal. When the welding seam is worked off, the fatigue strength can be raised up to 75 % of the base metal.