Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
INFLUENCE OF FSW PROCESS PARAMETERS ON THE MAGNITUDE OF RESIDUAL STRESSES IN AA7075-T651 ALUMINUM ALLOY WELDED JOINTS
Submission Author:
Jefferson Segundo de Lima , PB
Co-Authors:
Jefferson Segundo de Lima, Oclávio Coutinho dos santos, Amós Freitas de Figueirêdo, Raphael Henrique Falcão de Melo, Theophilo Maciel
Presenter: Jefferson Segundo de Lima
doi://10.26678/ABCM.COBEM2019.COB2019-1359
Abstract
Aluminum alloys has excellent characteristics and mechanical properties. The 7xxx series of aluminum alloys, in particular, have a high mechanical resistance. However, the welding of thermally treatable aluminum alloys by conventional arc welding process results in an excessive degradation its mechanical resistance and inceasing its residual stress level. In this context, Frinction Stir Welding (FSW) process has received attention in recent years mainly because it does not reach the melting point of the material during the process. This work aims to analyze the influence of the parameter process on microhardness, microstructure and residual stresses of AA7075 alloy welded joint by FSW process. For this purpose, tool rotational speed, welding speed and tool shoulder input were varied. The preliminary results shows that a high tool rotational speed, around 1415 RPM, generates lower levels of residual stresses. With realization of design of experiment (DOE), we expect an empirical relationship capable of effectively predict the magnitude of residual stresses of FSW joints at the 95% per cent confidence level.
Keywords
Friction Stir Welding, Aluminum alloys, Residual stresses, Aluminum 7xxx
