Ultrasound Method

One of the main stages of production process in manufacturing articles is thermic processing. Quality control of thermal processing consists in hardness measurement. For hardness measurement methods of Brinnel (SS 9012 - 50), Rockwell (SS 9013 - 59), Vikkers (SS 9013 - 59) et al are used. They are based on different methods of static and dynamic effect on the surface of the tested body that is metal is subjected to contact loading. The main disadvantages of mechanical methods are their low productivity, impossibility of series control, large labour intensiveness and in some case the need of destruction of the detail itself. All this facts do not allow achieving 100 % control of the manufactured production. For excluding the drawbacks of destructive methods one tried to measure hardness applying nondestructive, ultrasound method. For this purpose a device for measuring rate of ultrasound spread in rollers of reinforced concrete bearing has been constructed.