Full text
| |
| Author(s): |
Artur Mariano de Sousa Malafaia
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2009-02-17 |
| Examining board members: |
Dirceu Spinelli;
Marcelo Tadeu Milan;
Marcelo Falcão de Oliveira
|
| Advisor: | Dirceu Spinelli |
| Abstract | |
The main aim of this work was the determination of the parameters governing the Friction Stir Spot Welding (FSSW) of a AA2024-T3 aluminum alloy, by the obtained results comparison in pull-out and shear tensile tests and fatigue tests in lap-joints. Riveted joints of the same alloy were also tested in the same conditions for mechanical properties comparison. The main FSSW process parameters were: plunge rate, dwell time, tool penetration and tool rotational speed. The tool penetration and the tool rotational speed parameters were focused. The shear tensile tests results allowed the lap-joint shear resistance determination, that was lower, but close, of those obtained with riveted lap-joints. Microstructure and micro-hardness analysis was carried out to elucidate some tests perfomed results. The fatigue tests was performed in load control, with load ratio R of 0,1, in a lap joint produced with the same parameters of the specimen which presented the best tensile results. For the welded joints, a monitoring defect technique (CVM comparative vacuum monitoring), difference vacuum pressure based, was used showing good results. Although similar results in shear tensile tests, the welded joints showed so lower life in the fatigue tests, when compared with riveted joints. (AU) | |