적외선 열화상 카메라를 이용한 탄소강관 용접부 결함검출

Abstract

The piping system accounts for a large portion of the machinery structure of a plant, and is consideredas a very important mechanical structure for plant safety. Accordingly, it is used in most energy plantsin the nuclear, gas, and heavy chemical industries. In particular, the piping system for a nuclear plant is generallycomplicated and uses the reactor and its cooling system. The piping equipment is exposed to diverse loads suchas weight, temperature, pressure, and seismic load from pipes and fluids, and is used to transfer steam, oil, andgas. In ultrasound infrared thermography, which is an active thermography technology, a 15-100 kHz ultrasoundwave is applied to the subject, and the resulting heat from the defective parts is measured using a thermographycamera. Because this technique can inspect a large area simultaneously and detect defects such as cracks anddelamination in real time, it is used to detect defects in the new and renewable energy, car, and aerospace industries,and recently, in piping defect detection. In this study, ultrasound infrared thermography is used to detectinformation for the diagnosis of nuclear equipment and structures. Test specimens are prepared with piping materialsfor nuclear plants, and the optimally designed ultrasound horn and ultrasound vibration system is used todetermine damages on nuclear plant piping and detect defects. Additionally, the detected images are used toimprove the reliability of the surface and internal defect detection for nuclear piping materials, and their fieldapplicability and reliability is verified.