Abstract No.:	944
Scheduled at:	Poster Presentation Prüfung Inspection
Title:	WELDED STEEL METALLURGICAL AND MECHANICAL CHARACTERICS DETERMINATION USING ULTRASONIC ANALYSIS.
Authors:	faiza BOUKAZOUHA / CENTRE de recherche scientifique et technique en soudage et controle, ALGERIA sonia djili / csc, chéraga, algeria rafik halimi/ csc, chéraga, algeria ali badidibouda/ csc, chéraga, algeria
Abstract:	Grain size of materials is an important engineering characteristic which influences its properties. Traditionally, optical metallographic technique is used to evaluate the grain size in the material. New trend is to use non-destructive testing (NDT). This NDT is widely applied in many applications due to the fact that it will not impair the future usefulness of the test object. Many efforts had been done to use longitudinal normal incident ultrasonic waves as a non-destructive evaluation technique for the estimation of the average grain size of carbon steel. In many cases, correlations have been noted between ultrasonic parameters such as velocity and attenuation, and material properties. In our work, we are interested by the use of ultrasound to show experimentally that the micrographic structure changes from layer to layer in the fusion zone of welds. In fact, the wave propagation in such complicated Medias like welds is hardly understood because of their heterogeneous and anisotropic nature. Within this context, an ultrasound bench is developed to quantify the change in the ultrasonic parameters. Two welded carbon steel plates have been selected to be investigated. Two processes are considered: The flux wire process and manual arc process.

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