The CREDOS project aims to reduce the deformations occurring after the machining of thick aluminium alloy sheets assembled by friction stir welding (FSW) by proposing a methodology to limit the apparition of residual stress during the welding operation.


The FSW (Friction Stir Welding) process allows the welding of aluminium alloy sheets without the difficulties associated with conventional fusion welding processes. It can therefore be used to produce blanks closer to the dimensions of the final parts and to reduce the Buy-to-Fly ratio. However, during the production of the complete manufacturing range, from welding to machining, strong deformations appear.


The objective of the project is to achieve FSW welding of aluminium alloy sheets without residual deformation after the entire process (welding, clamp release and machining) by working to minimise residual stresses in the welded blanks. A test bench will evaluate the potential of different stress minimisation technologies.