A study on thermal responses, microstructural issues, and natural aging in gas tungsten arc welding of AA2024-T4

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Sarmast, A ; Sharif University of Technology

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Type of Document: Article
DOI: 10.1177/0954405413501669
Abstract:
In this study, a three-dimensional model has been utilized for predicting thermal responses during tungsten arc welding of AA2024-T4 plates in which double ellipsoidal heat source model was employed to consider the moving torch in the model. Furthermore, tensile and hardness tests and microstructural evaluations have been carried out to investigate the mechanical properties and the microstructures within the welded metal. The results show that there is a region inside the heat-affected zone where hardness increases while in some parts of this region having temperatures higher than 250 C the hardness decreases significantly. Furthermore, natural aging occurs after welding; however, its kinetics is not the same in different regions of the weldment owing to the differences in the imposed thermal cycles
Keywords:
Aluminum alloys ; Arc welding ; Mathematical modeling ; Mechanical properties ; Microstructures ; Electric arc welding ; Mathematical models ; Mechanical properties ; Microstructure ; Welding ; Double-ellipsoidal heat sources ; Gas tungsten arc welding ; Hardness increase ; Micro-structural ; Microstructural evaluation ; Thermal response ; Three-dimensional model ; Tungsten arc welding ; Hardness
Source: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture ; Vol. 228, issue. 3 , 2014 , p. 413-421
URL: http://pib.sagepub.com.ezp2.semantak.com/content/228/3/413