JOINING OF CELLULAR & STRATIFIED LAMINATES FOR LIGHT WEIGHT CONSTRUCTION AND THERMAL - ACOUSTIC INSULATION

Hanebuth H.(1); Dötzer K.(1); Grönning Sörensen (2)

(1) Siemens AG, Germany ; (2) Technical University of Denmark

The Cellular & Stratified Laminates (C&S) are new steel sandwich structures with a core made of corrugated sheet. This structure claims to appropriate for high mechanical load and have a good isotropic behaviour with the regard to bending and torsion moment. Their structural and functional features wil make them competitive in the field of light weight construction as well as thermal insulation.
In order to avoid adhesive joining the investigations were focused on an appropriate joining technique with the regard to high stiffness and strength. Low warping as well as one sided high optical quality in a visible area ae also important. Furthermore, the aim of the joining technique is a fast and reliable industrial joining processes for large scale laminates. Three different joining techniques have therefire been compared; laser beaming welding, resistance welding and furnace (vacuum) brazing.
At the end of this paper the joined laminates will be compared concering their mechanical properties with regard to strength, stiffness, warping and corrosion resistance.

Keywords : Cellular & Stratified Laminates, light weight construction, thermal-acoustic insulation, stainless steel 304, resistance welding, laser beam welding, furnace (vacuum) brazing, Erichsen-test, tensile shear test, warping, corrosion resistance