Evaluación del desempeño operacional y frente al desgaste erosivo de un aporte R-FeCr convertido en aporte por SMAW
Fecha
2015-07-20
Autores
García Hernández, Alexis
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Editor
Universidad Central "Marta Abreu" de Las Villas
Resumen
En el presente trabajo se aborda un estudio sobre el desempeño de un aporte oxiacetilénico R-FeCr
convertido en aporte por arco eléctrico E-FeCr, con el objetivo de utilizarlo en la restauración de elementos sometidos a desgaste erosivo, en particular las hélices de un tornillo extrusor de cerámicas. Se detalla la influencia de la corriente de soldadura en el comportamiento técnico –
operativo y propiedades del depósito (rendimiento real, estabilidad de funcionamiento, metalografía
y dureza del depósito) del consumible modificado, debido a la necesidad de incrementar la productividad en el recubrimiento superficial de las hélices y disminuir deformaciones, sin reducir
las propiedades del metal depositado. Se evalúa además, mediante un diseño de experimentos, la
influencia de la corriente de soldadura (80A; 100A; 120A) y el ángulo de incidencia de la partícula
(15°; 45°; 90° ) sobre el coeficiente de desgaste erosivo del aporte, utilizando para ello un dispositivo desarrollado para el ensayo de materiales a erosión seca. Para valorar la durabilidad de los depósitos, el estudio de erosión se realiza tomando como referencia el material original de las hélices del extrusor. Se concluye que el electrodo con recubrimiento aplicado presenta un adecuado desempeño operativo, posibilitando obtener depósitos por SMAW, propios para enfrentar el desgaste erosivo con un 70 % de durabilidad en relación con el material de referencia.
The present work consists of a study for the conversion of an oxyacetylene R- FeCr filler metal in electric arc filler metal E- FeCr, with the objective of using it in the restoration of elements subject to erosive wear, particularly propellers of a ceramic’s extruder screw. The influence of the welding current is detailed in the technical - operative behavior and properties of the deposit (real yield, operation stability, metallography and hardness of the deposit) of the consumable reconverted, due to the need to increase the productivity of the hardfacing processes and decrease the propeller´s deformation, without reducing the properties of the deposits. It is also evaluated by means of a design of experiments, the influence of the welding current (80A; 100A; 120A) and the attack angle (15°; 45°; 90°) on the erosive wear coefficient of material supply, using an device developed for dry erosion. To value the durability of the deposits, the erosion study is carried out taking like reference the original material of the extruder´s propellers. You conclude that consumable reconverted presents an appropriate technical- operative performance, facilitating to obtain deposits for SMAW process, to face the erosive wear with 70% of durability in relation to the reference material.
The present work consists of a study for the conversion of an oxyacetylene R- FeCr filler metal in electric arc filler metal E- FeCr, with the objective of using it in the restoration of elements subject to erosive wear, particularly propellers of a ceramic’s extruder screw. The influence of the welding current is detailed in the technical - operative behavior and properties of the deposit (real yield, operation stability, metallography and hardness of the deposit) of the consumable reconverted, due to the need to increase the productivity of the hardfacing processes and decrease the propeller´s deformation, without reducing the properties of the deposits. It is also evaluated by means of a design of experiments, the influence of the welding current (80A; 100A; 120A) and the attack angle (15°; 45°; 90°) on the erosive wear coefficient of material supply, using an device developed for dry erosion. To value the durability of the deposits, the erosion study is carried out taking like reference the original material of the extruder´s propellers. You conclude that consumable reconverted presents an appropriate technical- operative performance, facilitating to obtain deposits for SMAW process, to face the erosive wear with 70% of durability in relation to the reference material.
Descripción
Palabras clave
Desgaste Erosivo, Recargue Duro, Comportamiento Operacional, SMAW, Erosive Wear, Hardfacing, Operational Behavior