Abstract
Within this investigation mechanical properties of friction stir welded high strength aluminum blanks are determined. The recrystallization behavior of base material and weld nugget material are analyzed regarding prestraining in a cold upsetting and rolling process. Finally the properties of natural and artificial aged specimen are compared in uniaxial tensile tests. It can be shown that the prestraining has a significant effect on the resulting grain size after solution heat treatment in the weld nugget. Recrystallization and the evolution of a coarse grain structure in the nugget leads to a reduced strength and ductility for both ageing conditions. For the process design of manufacturing tailored aluminum blanks the prestrain dependent recrystallization and part property evolution has to be considered especially for the weld nugget area.
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