Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
STUDY OF FRICTION STIR SPOT WELDING PARAMETERS FOR AN ALUMINUM ALLOY AA2024- T3
Submission Author:
Ana Paula de Oliveira Costa , MG , Brazil
Co-Authors:
Alexandre da Silva Alves, Levi Mello dos Santos, Pedro Paiva Brito, Sara Silva Ferreira de Dafé, Ana Paula de Oliveira Costa
Presenter: Sara Silva Ferreira de Dafé
doi://10.26678/ABCM.COBEM2017.COB17-2842
Abstract
This work presents a study of the friction stir spot welding parameters used to an aluminum alloy 2024-T3 for aircraft structures. The welding was performed in a milling machine with rotations of 1000, 2000, 3000 and 4000rpm. The advancement speeds were 5mm/min from 0 to 0.95mm and 2mm/min from 0.95mm to 1mm. This speeds ensure that the tool remained 2 seconds along the sheet thickness, which was 1mm . The microstructures of the welded joints were evaluated by optical and scanning electron microscopy, while the mechanical properties were evaluated by Vickers microhardness and shear test. The results obtained were compared to each other and to the conventional method used in the aeronautical industry, riveting. Energy-dispersive X-ray spectroscopy analysis, EDS, showed that the heating generated by friction stir spot welding did not change the chemical composition by atomic diffusion along the different weld zones compared to the matrix. Vickers microhardness, also showed that this process did not promote any work hardening, further benefiting this process. It was verified that the 3000 rpm rotation welding performed the best mechanical performance due to its high shear strength, 99.7 MPa, and better adhesion when compared to the riveted joint.
Keywords
spot welding, Friction Stir Welding, FSW – Friction Stir Welding Soldagem, shear, Microstructure, Aluminum AA2024- T3, strength
