Non-Destructive Testing of Continuously Cast Billets by Means of the Laser Triangulation Method

Nowadays, there have been increasing demands for the surface quality of hot rolled bars and wires evoked by customers. Among other quality parameters is the presence of miscellaneous defects and other heterogeneities on the surface of billets which serve as the input material for the production of the above mentioned rods and wires in Třinecke železarny, a. s. In this paper we assume and predict a correlation between the surface defects found on billets and the frequency distribution of various defects on the surface of rolled products. Therefore, it is important to map the whole billet surface and for this purpose we have tested the laser triangulation method. The results indicate a good applicability of this method for surface testing.