Abstract
Weld metal hydrogen assisted cracking was studied using two flux cored wire (AWS E 70T-5 and AWS E 120 T5-K4) and a mixture gas of CO 2 + 5% H 2 to induce high values of diffusible hydrogen in high strength low alloy steel (HSLA-80) weldments. An Acoustical Emission Measurement System (AEMS) RMS voltmeter was coupled to the implant test (NF 89-100) apparatus to determine energy, amplitude and event numbers of signal. All cracks were initiated in the partially melted zone and propagated into the coarse-grained region of the heat affected zone when E 70 T5 consumable was used, and the quasi-cleavage fracture mode was predominant. When E 120 T5 K4 consumable was used the cracks propagated vertically across the fusion zone, and a mixed fracture mode was the most important. A significant relationship between acoustic emission parameters and fracture modes was found.
Highlights
Weld metal hydrogen assisted cracking was studied using two flux cored wire (AWS E 70T-5 and AWS E 120 T5-K4) and a mixture gas of C02 + 5 % H2 to induce high valúes of diffusible hydrogen in high strength low alloy steel (HSLA-80) weldments
RMS voltmeter was coupled to the implant test
Ferritic Steel Weld Metal Produced by Are Welding
Summary
Para el desarrollo del trabajo se utilizó un acero microaleado, con la composición química y propiedades mecánicas que se muestran en la tabla I. Los resultados mostraron que el nivel de hidrógeno fue diferente para cada alambre usado, siendo como media 22,37 ml/100 g del metal depositado (MD), para el alambre T-120 y 18,02 ml/100 g MD para el alambre T-75. En la figura 1 se muestra, de forma representativa, un diagrama de bloques, que fue acoplado a la instalación del ensayo de implante, permitiendo monitorizar la formación de las grietas asistidas por hidrógeno. - Software RUPTURA para la adquisición de los datos de emisión acústica con frecuencia de adquisición de 50 kHz. A través del análisis de la forma de las ondas de EA, se midieron los siguientes parámetros: número de ciclos, energía y amplitud RMS de la señal de EA. Es importante señalar que la ZF obtenida con este alambre estaba compuesta por
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