Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Micro-structural and mechanical properties of spot welded Aluminum to Steel compounds for vehicle construction



Datum: 04.12.2013


Author

  • Dr.-Ing. Christian Neudel

Reporter

  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. habil. M. Schaper

The scope of this thesis was resistance spotwelding of aluminum to steel by using additionalprocess tapes. Caused by new materialconcepts with elevated strengths the limitsof mechanical joining technologies arereached. The welding parameters and machineparts were varied systematically toadjust reproducible joining characteristicsand force the intermetallic phases to growin a specifically range. Thereby the influenceof different alloys and coatings on thephase formation was analyzed by metallographic,energy dispersive X-ray spectroscopy,electron backscatter diffraction andthe mechanical characterization with tensiletests. The central goal was to develop a fundamentalunderstanding of the welding processand the identification of substantiallyinfluencing factors on the phase formation.Based on these results the welding processcould be verified in a simulation. Furthermorea forecast of the intermetallic phaseformations is possible, which enables acharacterization of the joint.