Since the development of eddy current testing in the early to mid-1900s this method has been used to detect defects and properties of many types of metals. The most common applications are testing tubular products for transverse defects, testing bar or wire products for longitudinal surface defects, and testing parts for defects and properties such as hardness. Eddy current testing is also widely used in the aerospace industry to detect defects and anomalies in both new manufacturing and in-service inspection roles. This article will focus on eddy current technology and its use in the tubing, wire and parts industries.
MultiMac® eddy current screen display of signals illustrating signal “noise”, usually from vibration or similar extraneous sources, and a defect. Image source: Magnetic Analysis (Click on image to enlarge.)