EMC - Trabalhos de Conclusão de Curso
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Navegando EMC - Trabalhos de Conclusão de Curso por Autor "Alves, Renata Rodrigues"
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Item Avaliação do efeito da trajetória na fabricação de roldana de FeCrC-Nb pelo processo de manufatura aditiva por deposição a arco(Universidade Federal de Goiás, 2023-09-15) Carvalho, Lúcio Mateus Santana; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Alves, Renata Rodrigues; Marques, Vitória Ferreira de OliveiraThe welding process with flux cored wire (FCAW), using FeCrC+Nb alloy, made it possible to produce high hardness parts. This project evaluated the use of different weld patterms to analyze hardness values in different areas of the part, along the bead and weld layers. Two sheaves were made by different welding patterns, weaving and concentric circles (CC). The presence of the primary carbides M7C3 and NbC was found to affect hardness. The weaving pattern presented higher hardness than the CC pattern, which is justified by the strong presence of hard carbides.Item Efeito da temperatura de intercamada na liga a base de FeCrC-Ti na fabricação de pré- formas via manufatura aditiva por deposição à arco (MADA)(Universidade Federal de Goiás, 2020-11-13) Souza, Geovanna Pinheiro de; Souza, Daniel; Souza, Daniel; Ferreira Filho, Demostenes; Alves, Renata RodriguesThe additive manufacturing (AM) process, over the last few years, has experienced great developments that have allowed the manufacture of parts from different materials. 3D printing using polymers is already a reality, but metallic printing is still complex and costly. In view of this, the proposal arises to use welding processes for the manufacture of metallic components through the principle of additive manufacturing. On the other hand, there are several technological challenges related to the use of these processes. Due to the heat that is imposed on the metallic material during welding, the manufactured parts suffer severe thermal cycles that affect, on a larger scale, materials with more alloying elements in their chemical composition or that are produced from thermomechanical processes. In these materials, the thermal cycle imposed during welding causes microstructural changes that in turn govern the mechanical properties. Therefore, the objective of this project is to evaluate the effect of interlayer temperature on the microstructure, hardness and stability of the wall of the FeCrC-Ti based alloy. For this, three preforms with different interlayer temperatures, namely, 50 °C, 150 °C and another without stops, were produced through the additive manufacturing process by arc deposition using the Flux-cored arc welding process. A 1.6 mm diameter self-shielded tubular wire made of FeCrC+Ti alloy was used. With the manufactured preforms, it was possible to evaluate the effects of the interlayer temperature on the microstructure, as well as to evaluate factors such as geometric stability and hardness. The resulting microstructure showed great similarity between the analyzed preforms, with a certain variation only in the one carried out without stops throughout the welding process, in which the appearance of cracks also occurred. The preform manufactured non-stop with cooling only at the end of welding, obtained the best results in terms of geometric stability and hardness.Item Estudo do uso da escória ferro-níquel no processo de soldagem utilizando o processo MIG/MAG adaptado para arco submerso(Universidade Federal de Goiás, 2023-08-16) Machado, Yago de Moraes; Figueiredo, Kléber Mendes de; Figueiredo, Kléber Mendes de; Alves, Renata Rodrigues; Alves, Fleide Wilian Rodrigues; Ferreira Filho, DemostenesThis study aimed to investigate the feasibility of utilizing ferro-nickel slag as a flux for submerged arc welding by incorporating carbon into its composition to enhance the hardness of the weld bead. The experimental process was conducted in collaboration with Anglo American, a mining company, which provided the slag for research purposes. The initial phase involved the adaptation of the MIG/MAG welding machine for submerged arc welding. This adaptation included the development of a 3D-printed support for the welding torch and a flux feeder. Subsequently, the welding parameters were systematically tested and adjusted, resulting in the production of a uniform weld bead. Subsequently, hardness and metallography tests were performed on various samples of weld beads on steel plates. A sample was used with pure CO 2 in the MIG/MAG process to serve as a reference for comparison with the submerged arc welding process results. In the submerged arc samples, experiments were conducted both with and without the removal of the mill scale. Additionally, an experiment was conducted with 1% carbon in the flux composition to explore the potential of increasing the coating hardness during the welding process. The metallography results exhibited promising outcomes with minimal fluctuations in hardness values.Item Influência da rugosidade superficial na molhabilidade de cordões de solda(Universidade Federal de Goiás, 2023-08-10) Mateus, Lucca Castro Gonçalves de; Ferreira Filho, Demostenes; Souza, Daniel; Alves, Renata Rodrigues; Marques, Vitória Ferreira de Oliveira; Souza , DanielWettability in weld beads is related to the convexity of the bead and the contact angle with the base material surface. This is an important parameter for weld quality since beads with high convexity can create stress concentrators in parts subjected to cyclic stresses and lack of fill in coating operations. Therefore, the objective of this study is to evaluate whether the surface finish of the base material will influence the wettability of weld beads on carbon steel sheet using the MIG/MAG process. The method used involved generating different levels of roughness through machining processes. The roughness was then measured, and weld beads were performed on each of the surfaces. Welding tests were conducted using two shielding gases to verify if the same behavior would be observed for each of them. The criterion used was the measurement of the contact angle of the bead edges from cross-sectional cuts analyzed by macrographs. The results showed that it was not possible to observe a noticeable change in the contact angle as a function of roughness using the method employed, which proved to be limited for the proposed objective