Frecuencia del palpador para pruebas ultrasónicas y su influencia en propiedades acústicas en un bloque estándar
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Date
2024-04
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Publisher
Universidad Nacional de Trujillo
Abstract
La técnica de ultrasonido industrial es muy utilizada para detectar disconformidades internas en
los materiales estructurales, como es importante determinar la posición exacta del defecto para
posterior reparación, se requiere de bloques estándar de propiedades símiles al componente de
ensayo que dispongan barrenos cuyas amplitudes permitan evaluar por comparación las generadas
por defectos acorde a criterios de aceptabilidad establecidos en códigos de fabricación. El objetivo
de la investigación fue fabricar un bloque para calibración en el sistema de prueba de ultrasonido
mediante medidas acústicas conforme varia la frecuencia de oscilación. Los factores sónicos se
registraron por la técnica pulso-eco y contacto directo, fueron realizadas 4 corridas en cada
experimento y tres repeticiones con ondas acústicas longitudinales y corte con ángulo de refracción
en acero de 70º, las frecuencias fueron 2.25 y 5.0 MHz. Los resultados indican que las medidas
ultrasónicas varían con la frecuencia del transductor, con lo cual se recomienda utilizar para la
inspección el mismo transductor utilizado para calibración. El bloque de referencia propuesto
permitió calibrar en distancia y establecer curvas para referencia durante la evaluación de uniones
por soldadura de acuerdo con los códigos ASME sección V y AWS D 1.1.
The industrial ultrasound technique is widely used to detect internal nonconformities in structural materials. As it is important to determine the exact position of the defect for subsequent repair, reference blocks with characteristics similar to the test element are required that have holes whose amplitudes allow evaluation. by comparison those generated by defects according to acceptability criteria established in manufacturing codes. The objective of the research was to manufacture a block for calibration in the ultrasound test system using acoustic measurements by varying the beam frequency. The acoustic factors were obtained by the pulse-echo technique and direct contact, 4 experimental runs with three repetitions were carried out to produce acoustic waves with a straight and transverse beam with a refraction angle in steel of 70º and frequencies of 2.25 and 5.0 MHz. The results indicate that ultrasonic measurements vary with the frequency of the transducer, which is why it is recommended to use the same transducer used for calibration for inspection. The proposed reference block allowed calibration in distance and establishment of reference curves for the inspection of welded joints according to the ASME section V and AWS D 1.1 codes.
The industrial ultrasound technique is widely used to detect internal nonconformities in structural materials. As it is important to determine the exact position of the defect for subsequent repair, reference blocks with characteristics similar to the test element are required that have holes whose amplitudes allow evaluation. by comparison those generated by defects according to acceptability criteria established in manufacturing codes. The objective of the research was to manufacture a block for calibration in the ultrasound test system using acoustic measurements by varying the beam frequency. The acoustic factors were obtained by the pulse-echo technique and direct contact, 4 experimental runs with three repetitions were carried out to produce acoustic waves with a straight and transverse beam with a refraction angle in steel of 70º and frequencies of 2.25 and 5.0 MHz. The results indicate that ultrasonic measurements vary with the frequency of the transducer, which is why it is recommended to use the same transducer used for calibration for inspection. The proposed reference block allowed calibration in distance and establishment of reference curves for the inspection of welded joints according to the ASME section V and AWS D 1.1 codes.
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Keywords
TECHNOLOGY::Chemical engineering::Metallurgical process and manufacturing engineering::Metallurgical process engineering