• Energy Research

GJS 400-15 ductile cast iron has excellent physical-chemical, mechanical-structural and manufacturability properties. However, it has notable limitations when it is subjected to the welding operations to which it is subjected. The objective of this work is the characterization of the welds made in GJS 400-15 ductile cast iron parts, specifically 6mm thick sheets, to determine their applicability based on the mechanical and microstructural properties obtained. For this, several welding procedures have been proposed, in which an Fe-Ni alloy is used as a filler material and SMAW and TIG welding techniques are combined with different heat treatments. The mechanical characterization tests have been based on tensile analysis and hardness determination. As for the micrographic analysis, it has been carried out through the micrographs of the thermally affected areas (base metal, interface and welding. TIG welding, in general terms, has been effectively effective in the welding processes of nodular cast iron sheets despite its disadvantage in the results obtained compared to the SMAW technique. On the contrary, the advantages that the TIG welding technique presents in terms of execution time and more favorable cost open a way to the development, technical evolution and industrialization of the welding processes carried out using this last technique. It is hoped that the study will present a positive contribution to the technological development of welding processes and their industrial application to the manufacture, maintenance or repair of parts and products in which ductile iron is present and especially those formed by steel plates. small thickness. Keywords: ductile cast irons welding, SMAW, TIG, heat treatments, preheating, annealing, traction, hardness, micrograph

[ES] La enseñanza invertida logra una nueva aplicación a través del desarrollo de proyectos en pasantías. Un estudiante del IUT Paris-Orsay se unió al proyecto de energía sostenible propuesto desde el DIMM para comprender el desempeño de un sistema híbrido compuesto por un panel fotovoltaico de aSi y una célula de combustible reversible tipo PEM para obtener, no solo las competencias técnicas relacionadas con las mediciones físicas y adquisición de datos requeridas, sino también una comprensión práctica de las bases fundamentales de la energía sostenible en la edificación. Los resultados han permitido el desarrollo de un modelo piloto de una residencia fotovoltaica autónoma. El modelo evalúa el tamaño, los costos de capital, las estrategias de control y las eficiencias de los sistemas de energía renovable acoplados. La pasantía se convirtió en un entorno autoexploratorio en el que el estudiante adquirió las habilidades técnicas esperadas en un entorno de aplicación natural con excelentes resultados. [EN] Flipped teaching has reached a wonderful new application through internship based project development. A student from IUT Paris-Orsay joined the proposed sustainable energy project for understanding the performance of a coupled a-Si PV panel / PEM reversible fuel cell for gathering the technical competencies related to physical measurements and data acquisition while at the same time developing a practical understanding of sustainable energy developments for application on the built environment. The results have allowed the development of a pilot model of a photovoltaic (PV) powered residence in stand-alone. The model assesses the sizing, capital costs, control strategies, and efficiencies of coupled renewable energy systems. The internship turned out into a self-exploratory environment where the student acquired the expected technical skills in a natural application environment with excellent results