It is true that magnetic particle testing (MT) is one of the oldest NDT methods, and over the years has proven itself to be not only reliable, but cost effective, when it is applied properly with qualified personnel. Earlier articles published in Quality, “Key Elements of Magnetic Particle Testing” and “Magnetic Particle Testing Issues,” covered basic elements, techniques, variables, procedures and evaluation. It is the purpose of this article to point out the problems that can result when MT is not done correctly. One of the subtle pitfalls occurs when the practitioner becomes lackadaisical due to repeated use over the course of an extended period. It is true that MT is not one of the most exciting and challenging NDT methods, and in many cases, it can be extremely routine and repetitious. Simply put, it’s hard work. It takes concentration and dexterity. The equipment can be heavy, and the work environment may be dirty or noisy. In many instances, MT personnel are not given the respect and recognition they deserve. And yet, they are required to be qualified in the technology and pass examinations for certification.
Current codes, specifications and contracts usually require MT personnel to be certified. And while certification is important and provides for a level of recognition, it is far more important that the personnel be qualified. It is well known that qualification is a blend of training and experience.