CRACK SIZE DETECTION OF FATIGUE CRACK BY EDDY CURRENT TESTING C-SCOPE VISUALIZATION SYSTEM

Abstract

 The Eddie Current Test (ETC) is capable of detecting cracks from the surface of paint film and has excellent efficiency and economical advantage to Magnetic Particle Testing. But when it is applied to a round weld part where the shape and direction of weld bead changes frequently, it is said that ETC likely fails to detect small crack or miss judge as crack exist where it doesn’t. The newly developed eddy current flaw detection imaging system performs C-Scope imaging by displaying the estimated crack shape at the scan position. We attempted to improve the accuracy of fatigue crack detection of the crack in the early stage of propagation by removing signal noise, which shows spatial distribution around a round weld. Furthermore, accuracy of the C-Scope images were evaluated using real fatigue crack specimens produced in the beachmark loading fatigue test.