Simulations using this model are validated by experimental observations. A thermo-mechanical computational model employing a coupled Eulerian-Lagrangian approach is developed to quantitatively capture the morphology of these interlocks during the FSW process.
The cutting-scribe induces deformation in the bottom plate which leads to the formation of mechanical interlocks or hook like structures at the interface of two materials. For welds in lap configuration, an enhancement to this technology is made by introducing a short, hard insert, referred to as a cutting-scribe, at the bottom of the tool pin.
The solid state nature of the process enables joining materials with strikingly different physical properties. Joint characterization, including mechanical tests and joint performance, will also be presented.įriction stir welding (FSW) is a popular technique to join dissimilar materials in numerous applications. Details of welding trials, unique challenges, and mitigation strategies in different material combinations will be discussed. Department of Energy Vehicle Technologies Office and several automotive manufacturers and suppliers, Pacific Northwest National Laboratory is developing the FSS process and has demonstrated the viability of joining several material combinations. FSS uses an offset cutting tool at the tip of the friction stir welding pin to create an in situ mechanical interlock between material interfaces. The friction stir scribe (FSS) technique is a promising method that produces continuous overlap joints between materials with vastly different melting regimes and high-temperature flow characteristics. The ability to effectively join materials with vastly different melting points, like aluminum to steel, and polymer composites to metals, has been one of the roadblocks to realizing multi-material components for lightweighting efforts.
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