Effect of Overlap Orientation in Fatigue performance of Friction Stir Welding of Magnesium sheets
J.F.C Moraes1; R.I. Rodriguez1; J.B. Jordon1
1 The University of Alabama
doi:10.20906/CPS/COB-2015-2709
Resumo
In this work, the effects of sheet stacking orientation on fatigue performance of friction stir welding (FSW) of overlap joints is presented. During FSW, it is well known that the advancing and retreating flow of the material generated by the tool creates asymmetrical weld features. As such, FSW was carried out on 2mm thick AZ31 magnesium alloy sheets, where the orientation of the pull direction of the overlap joint was varied with respect to the tool rotation direction. Load control fatigue tests at R= 0.1 were carried out until full separation of the joint was achieved. Fatigue results showed that the overlap joints loaded on the retreating side exhibited superior performance compared to the advancing side. Microstructure and fractography analysis suggest that the geometrical shape of the faying surface produced by the advancing and retreating flow determines the number of cycles to failure in FSW overlap joints.
Palavras-chave: Fatigue; Friction stir welding; Magnesium