Ispitivani su uticaji parametara frikcionog zavarivanja mešanjem na ponašanje loma udarom po Šarpiju u leguri Al-Mg 5083. Rotaciona i poprečna brzina zavarivanja su povezane sa dinamičkom inicijacijom prsline i duktilno čupanje. Mehanizam loma je razjašnjen numeričkom i fraktografskom analizom. Rezultati pokazuju da na inicijaciju i na stabilan rast prsline ne utiču toliko parametri postupka zavarivanja, koliko deformaciono ojačavanje ispitane legure. Međutim, konačna nestabilna faza duktilnom cepanja u velikoj meri zavisi od grešaka unutar zone mešanja u metalu šava.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
