Examinando por Materia "ZAT"

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    PublicaciónAcceso abierto
    Efecto de la entrada de calor en la tenacidad a la fractura de las diferentes zonas de juntas soldadas de acero ASTM A572-Gr50 producidas por el proceso de soldadura GMAW y gas 90Ar-10CO2
    (2022-02-27) Herrera de Oro, Edinson de Jesús; Unfried Silgado, Jimy; Zambrano Rodríguez, Habib
    The effect of the heat input generated by the GMAW welding process and protective gas 90Ar10CO2 on the fracture toughness of the different welding zones in the joints of ASTM A572 Gr 50 steel, which is a high-quality steel, was evaluated. High strength and low alloy (HSLA). Initially, the characterization of the base metal was carried out through techniques such as: optical emission spectrometry, optical microscopy, tensile tests, hardness tests and fracture toughness tests, with these data on chemical composition, microstructure, stress creep, hardness and fracture toughness values, respectively. Subsequently, the welding of the 400mmX150mmX6,35mm steel plates was carried out, by means of GMAW, using different heat inputs (high and low). From the welding coupons, the different welding zones were identified by macrography; and the phases in said zones were identified by means of metallography and X-ray diffraction. Then the fracture toughness test was carried out on specimens with the pre-crack located in the thermally affected zone (HAZ) and in the weld metal zone, welded joints. It was evidence that the fracture toughness is correlated with the microstructural changes in the ASTM A572 Gr 50 steel product of the thermal inputs of the GMAW welding process, this has an impact on the resulting phases; as well as the size, location and composition of the precipitates.
  • Miniatura
    PublicaciónAcceso abierto
    Efecto de los procesos de soldadura al arco en las propiedades mecánicas y microestructura en aceros de alta resistencia y baja aleación
    (Universidad de Córdoba, 2020-09) Corrales Rhénals, Jorge Alejandro; Chica De Aguas, Jorge Eliécer; Unfried Silgado, Jimy
    The arc welding processes generate microstructural changes in the welded metals due to the contributions of heat, this leads to changes in the mechanical properties. In this monograph we sought to study the effect generated by these processes on the mechanical properties and microstructure of the joints, and to correlate this effect as an indicator of the weldability of these materials. Different investigations were analyzed in which the influence of various arc welding processes was observed, changing multiple parameters of the processes, as well as the heat inputs generated during welding on different high strength and low alloy steels (HSLA). According to the analysis carried out, it was found that there is a correlation between the type of microstructure and the mechanical properties and these depend directly on the heat input to which the material is subjected during the welding process. It was also possible to determine that the little variation in mechanical properties and microstructure are a clear indicator of the good weldability of these steels.