Original scientific paper

https://doi.org/10.17559/TV-20160417122830

Utjecaj kinematičkih faktora zavarivanja trenjem miješanjem na karakteristike zavarenog spoja kovanih ploča od legure aluminija EN AW 7049 A

Milenko Perović orcid.org/0000-0001-6171-0215 ; Chamber of Economy of Montenegro, Novaka Miloševa 29/II, 81000 Podgorica, Montenegro
Sebastian Baloš ; University of Novi Sad, Faculty of Technical Sciences, Trg Dositeja Obradovića 6, 21000 Novi Sad, Republic of Serbia
Dražan Kozak orcid.org/0000-0001-5245-4686 ; Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, Trg I. B. Mažuranić 2, 35000 Slavonski Brod, Republic of Croatia
Darko Bajić ; University of Montenegro, Faculty of Mechanical Engineering, Džordža Vašingtona bb, 81000 Podgorica, Montenegro
Tomaž Vuherer orcid.org/0000-0002-1866-8266 ; University of Maribor, Faculty of Mechanical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia

Abstract

In this paper, the influence of rotation speed and welding speed on the impact strength, microstructure and cross section micro hardness of FSW welded joints of Al-Zn-Mg-Cu high strength aluminium alloy is studied. Rotation speed was varied from 750 min−1 to 850 min−1 and welding speed from 60 mm/min to 80 mm/min. It was found that the energy of crack propagation is up to three times higher than the energy of crack initiation. This ratio was found by testing the Charpy notched specimens taken from left and right from the weld centre, 4 mm from the notch in a direction opposite to a direction of welding. Micro hardness distribution in the nugget does not show large dissipation of value regardless if the measuring point is in the upper or lower section of the nugget. Weld microstructure characteristics and zones are clearly defined at the basis of grain size and material flow.

Keywords

dynamic recrystallization; friction stir welding; impact strength; micro hardness distribution

Hrčak ID:

183029

URI

https://hrcak.srce.hr/183029

Publication date:

15.6.2017.

Article data in other languages: croatian

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