Propiedades acústicas de un bloque de referencia patentado para ensayo de ultrasonido industrial en juntas soldadas de acero inoxidable
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Date
2024-04
Authors
Espinoza Chugnas, Hector Noel
Araujo Eustaquio Juan Oswaldo
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Nacional de Trujillo
Abstract
El sistema de prueba de ultrasonido industrial utilizado para detectar discontinuidades en uniones soldadas, requiere patrones estándar de referencia para calibración, tal como el patentado por la universidad nacional de Trujillo el año 2023. El objetivo del trabajo fue determinar la aptitud del bloque de calibración previa a la inspección de una junta soldada de acero inoxidable, mediante la obtención de sus propiedades acústicas, al variar la frecuencia del transductor. Las medidas acústicas fueron obtenidas con frecuencias de 2, 5 y 5 MHz, con ondas compresivas y corte por contacto directo del transductor acoplado al bloque de referencia fabricado de acero inoxidable, la inspección fue realizada en una junta soldada de acero inoxidable, para la evaluación de defectos se asumió como referencia el código AWS D 1.6. Las propiedades acústicas en el bloque estándar difieren cuando aumenta la frecuencia de oscilación, disminuyendo la rapidez en la onda e incrementó el coeficiente de atenuación, por mayor dispersión del haz en los límites del grano. De hecho, fue necesario ejecutar la prueba con idéntica frecuencia a la de calibración. Con lo cual, el bloque de referencia estándar por su geometría, es adecuado para calibración del ensayo de ultrasonido industrial.
The industrial ultrasound testing system used to detect discontinuities in welded joints requires standard reference standards for calibration, such as the one patented by the National University of Trujillo in 2023. The objective of the research was to demonstrate the suitability of the block for calibration prior to the inspection of a stainless steel welded joint, by obtaining its acoustic properties, by varying the frequency of the transducer. The acoustic measurements were obtained with frequencies of 2, 5 and 5 MHz, with compressive waves and cutting by direct contact of the transducer coupled to the reference block made of stainless steel, the inspection was carried out on a stainless steel welded joint, for evaluation of defects, the AWS D 1.6 code was assumed as a reference. The acoustic properties in the standard block differed when the transducer frequency was increased, the wave speed decreased and the attenuation coefficient increased, due to greater beam dispersion at the grain boundaries. Therefore, it was necessary to carry out the inspection with the same frequency used for calibration. Therefore, the standard reference block, due to its geometry, is suitable for calibration of the industrial ultrasound test.
The industrial ultrasound testing system used to detect discontinuities in welded joints requires standard reference standards for calibration, such as the one patented by the National University of Trujillo in 2023. The objective of the research was to demonstrate the suitability of the block for calibration prior to the inspection of a stainless steel welded joint, by obtaining its acoustic properties, by varying the frequency of the transducer. The acoustic measurements were obtained with frequencies of 2, 5 and 5 MHz, with compressive waves and cutting by direct contact of the transducer coupled to the reference block made of stainless steel, the inspection was carried out on a stainless steel welded joint, for evaluation of defects, the AWS D 1.6 code was assumed as a reference. The acoustic properties in the standard block differed when the transducer frequency was increased, the wave speed decreased and the attenuation coefficient increased, due to greater beam dispersion at the grain boundaries. Therefore, it was necessary to carry out the inspection with the same frequency used for calibration. Therefore, the standard reference block, due to its geometry, is suitable for calibration of the industrial ultrasound test.
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Keywords
TECHNOLOGY::Chemical engineering::Metallurgical process and manufacturing engineering::Metallurgical process engineering