Vol.13, No3, 2013, pp.171–177
 UDC 669.715`721: 539.42

IMPACT FRACTURE RESPONSE OF FRICTION STIR WELDED Al-Mg ALLOY

Abdasalam M. M. Eramah1, Srđan Tadić2, Aleksandar Sedmak1

1)University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia

2)Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, Serbia

Abstract

Effects of friction stir welding (FSW) variables on the Charpy impact fracture behaviour of Al-Mg 5083 alloy are investigated. Rotational and traversal welding rates are linked to the dynamic crack initiation and ductile tearing. The fracture mechanism is clarified by numerical and fractographic analysis. Results had revealed that initiation and stable crack propagation is not significantly influenced by the applied welding variables. It is attributed to the strain hardening of the investigated alloy. However, the final unstable phase of ductile tearing is strongly susceptible to the imperfections in the stirring zone of the weld

Keywords: impact fracture, ductile tearing, crack initiation, friction stir welding, aluminium alloys

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