Friction stir spot weld (FSSW) of AZ91 magnesium alloys; effect of axial force and rotational speed on weld quality and an approach on inspection planning

Authors : Yasin Sarikavak

Pages : 1615-1620

Doi:10.28948/ngumuh.1352828

View : 136 | Download : 150

Publication Date : 2023-10-15

Article Type : Research Paper

Abstract :In this study, the friction stir spot welding (FSSW) process for the magnesium alloy (AZ91) sheet materials are investigated. Friction stir spot welding (FSSW) is a solid-state welding process and one of the innovative methods to join specifically automotive components. Recently magnesium alloys are promising materials where combination of high strength and low density can be observed to improve vehicle performance and reduce emissions and fuel consumption in structural materials for automotive applications. A finite element model (FEM) established to understand the effect of axial force and rotational speed during the simulation in automotive applications. The FEM investigates the effect of axial force ranging from 1 kN to 8 kN and rotational speeds of 1000 rpm - 4000 rpm. The model analyses the heat flux and the temperature rise that leads defect formation after the process. 4.5 kN, 6 kN and 8 kN axial forces and 3000 rpm-4000 rpm rotational speeds are evaluated as the critical values in terms of defect and crack formation during the process under specified boundary conditions. Finally, several non-destructive inspection methods are suggested to secure structural integrity after the FSSW process to eliminate the harmful effects of surface and volumetric discontinuities.
Keywords : Sürtünme karıştırma nokta kaynağı, Sonlu elemenalar analizi, Magnezyum alaşımı AZ91, Eksenel kuvvet, Dönme hızı, Tahribatsız muayene