20th International Forgemasters Meeting - IFM 2017

Japan Casting & Forging Corporation (hereafter JCFC) has developed an automated Ultrasonic Testing (UT) system for the improvement in reliability and applied it to the practical examinations on more than hundreds pieces of rotor forgings for steam and generator components in electric power plants since 2010. After that, further amelioration of the testing condition has been conducted through the commercial inspection to expand the applicable rotor diameter. JCFC has consequently succeeded in increasing the size up to 2,264 mm dimeter by means of the optimization of signal noise ratio for a rise in the performance of flow detection near the surface. In addition, JCFC has introduced a new automated UT system for the forged discs. The system has been equipped with a phased array device to raise the examination efficiency. This paper will describe the improvement in the inspection technology to increase in the capable diameter on the current automated UT system for rotor forgings and the outline of the new facility for gas turbine discs. A future plan on the development of the phased array device will be mentioned.