In addition to mechanical and physical properties of the materials, the joining and production technologies needed for new materials and structural arrangements are important factors. Development of laser welding techniques enables the fast production of high quality and dimensionally accurate all steel sandwich panels. The research related to design and design formulations of all steel sandwich panels at the Ship Laboratory of Helsinki University of Technology, is reviewed in this report. The research has been carnied out in several national (Shipyard 2000, Weld 2000, Kenno Light Structures- Technology Program) and international (Advanced Composite Sandwich Steel Structures projects.