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Lecture

WEB Local Microscopic Analysis of Magnetic Pulse Welding (MPW) joints of Dissimilar metals



Sustainability, being one of the important modern-day topics, has gained attraction in many fields. The sustainable use of materials and material mixes are investigated in terms of their material performance as well as the joining properties. Magnetic pulse welding (MPW) is the combination of high-speed forming, impact and results in a partial weld at the collision zone of the accelerated flyer and the impacted target. The chosen dissimilar metal combination: aluminum ENAW1050 (flyer) and copper CUDHPR240 (target), which revolves around E-mobility applications. The flyer and target are positioned in different configurations and welded with different impact energies. The local effects for the dissimilar metal joints are then investigated by local micro tensile testing in the thickness direction, thereby resulting in local weld strength distribution. For micro specimen preparation, thin stripes (0,5 mm) are extracted from the welded zone. The local micro experiments are then correlated with micro structural analysis and micro hardness tests at the welding zone. These investigations give new idea on the weld formation mechanisms and the local material effects, as the weld formation and reasons for weld quality variation are not fully understood till now.

Speaker:
Dipl.-Ing. Balaji Ragupathi
Fraunhofer Institute for Mechanics of Materials IWM
Additional Authors:
  • Frank Huberth
    Fraunhofer IWM
  • Dr. Johannes Preußner
    Fraunhofer IWM