Abstract:The friction welding process is shown as an effective alternative compared to the conventional methods of joining materials, in particular Friction Hydro Pillar Processing (FHPP). With the use of automated equipment joints are produced with reliable quality and repeatability, making it possible to follow in real time the welding process. The study of the application of this process in different materials proves its use in production systems. The development of several lines of research shows that even varying materials and geometry of joints with at least 20 mm deep in thick plates, the processing time remains less than 6 (six) minutes. Furthermore, as a result joints with suitable metal/mechanical properties are made with low production cost and high productivity, even for materials with low weldability and with different characteristics. In this work will be presented various materials joined by FHPP, as well as its advantages and applicability.
Friction Stir Welding (FSW) is a solid-state joining process that has been demonstrating to be an excellent alternative for joining aluminum alloys. Therefore, this work presents the influence of process parameters (rotational speed, welding speed, and tool shoulder penetration) on mechanical properties of friction-stir-welded AA 5083-O. The welded joints were analyzed by metallography, tensile, and bending tests. Furthermore, the surface fracture of the best joint was evaluated by scanning electron microscopy (SEM) for verifying the major fracture mechanism. It was found that the ultimate tensile strength (UTS) of the welds was similar to that of the base material. Moreover, the microhardness profiles were comparable along the regions considered. Also, the failures of both bending and tensile tests tend to occur on the advancing side.
ResumoO processo de soldagem por fricção é uma técnica recente que vem sendo desenvolvida a fim de melhorar a qualidade das estruturas offshore. Com a finalidade de aperfeiçoar essa técnica é importante estudar as propriedades metalúrgicas do material soldado. Este trabalho tem como objetivo avaliar a tenacidade ao impacto de um aço C-Mn soldado por fricção com pino consumível, conhecido como FHPP (Friction Hydro Pillar Process). Desta forma, no presente estudo o material foi soldado, tratado termicamente, e após avaliado através de análises metalográficas, de microdurezas e ensaios de impacto Charpy. Como resultados foram geradas microestruturas para as diferentes regiões da solda e foram obtidos valores de energia, segundo a norma ASTM E-23. Por fim, conclui-se que o material não processado apresentou uma tenacidade superior a região de interface soldada, devido as diferentes microestruturas geradas no processo. Palavras-chave: Soldagem por fricção com pino consumível; Microestruturas; Tenacidade ao impacto Charpy.
EVALUATION OF THE IMPACT THOUGHNESS OF A C-MN STEEL WELDED BY FRICTION HYDRO PILLAR PROCESS AbstractThe friction welding process is a recent technique that has been developed with the view to improve the quality of offshore structures. In order to improve this technique is important to study the metallurgical properties of the welded material. This study aims to assess the toughness of a C-Mn steel welded by Friction Hydro Pillar Process (FHPP). Thus, in this study was carried out the welding process, the heat treatment, the metallography analyses, the hardness test and the Charpy impact tests. As result, microstructures were generated for various regions of the welded joint and the energy values were obtained according to ASTM E-23 standard. Finally, could be concluded that the base material has a greater toughness than in the interfacial area, due to the different microstructures generated in the process.
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