High-resolution characterization of welding interface of mixed metallic joints

Cross section through an aluminum copper seam fabricated by friction stir welding: light microscopy
© Fraunhofer IWS Dresden
Cross section through an aluminum copper seam fabricated by friction stir welding: light microscopy
High resolution TEM image of an aluminum copper joint interface produced by laser induction roll plating (LIRP)
© Fraunhofer IWS Dresden
High resolution TEM image of an aluminum copper joint interface produced by laser induction roll plating (LIRP)
  • IWS engineers and scientists are developing very promising technologies to fabricate mixed material structures (multi material designs) such as friction stir welding, induction roll plating and electromagnetic pulse joining
  • The processes occurring at the interface of different metals during joining (i.e. alloy and phase formation, plastic deformation) and their subsequent effects on the joint performance are mostly unknown
  • Heterogeneous material systems require special preparation techniques (ion beam polishing, etching and cutting) and high resolution analytical characterization methods (REM, TEM, EDX)
  • Current research results provide information for the reduction of intermetallic phase formation and thus create the basis for process optimization