Nondestructive Testing - Ultrasonic Examination - Basic principles of sound propagation and reflection in materials - Basics of ultrasonic testing procedures - Ultrasonic testing of a steel cylinder in the laboratory - Ultrasonic testing of wheelset axles in practice Responsible for this video: Prof. Dr.-Ing. Rainer Schwab, Hochschule Karlsruhe (Karlsruhe University of Applied Sciences), Germany