Eddy Current Testing of Weldment by Plus(+) Point Probe

Plus(+) Point Probe를 이용한 용접부 와전류검사

  • Lee, Hee-Jong (Nudear Power Generation Research Lab., Korea Electric Power Research Institute, KEPCO) ;
  • Kim, Yong-Sik (Nudear Power Generation Research Lab., Korea Electric Power Research Institute, KEPCO) ;
  • Nam, Mim-Woo (Nudear Power Generation Research Lab., Korea Electric Power Research Institute, KEPCO) ;
  • Yoon, Byung-Sik (Nudear Power Generation Research Lab., Korea Electric Power Research Institute, KEPCO) ;
  • Kim, Seok-Kon (Nudear Power Generation Research Lab., Korea Electric Power Research Institute, KEPCO)
  • 이희종 (한전 전력연구원 원자력연구실 원전설비지원그룹) ;
  • 김용식 (한전 전력연구원 원자력연구실 원전설비지원그룹) ;
  • 남민우 (한전 전력연구원 원자력연구실 원전설비지원그룹) ;
  • 윤병식 (한전 전력연구원 원자력연구실 원전설비지원그룹) ;
  • 김석곤 (한전 전력연구원 원자력연구실 원전설비지원그룹)
  • Published : 1999.12.30

Abstract

A plus-point eddy current test(ECT) probe was developed to examine the defects on the welds of pumps, valves, and pipings which are the major components of the electric power plants, non-destructive evaluation (NDE) techniques for detecting and sizing the flaws were studied adapting this probe. Differential plus-point ECT probe is consists of two "I"-type coils crossed each other and has an advantage having a small influence on the sensitivity by lift-off variation to the conventional types of probe. The specimens with crack-like electro discharge machining(EDM) notches on the weld of type 304 stainless-steel were fabricated in order to evaluate the plus-point ECT probe response to the flaws. NDE techniques to detect and size the flaws and estimate the flaw type were established with this specimens.