The NDT Methods on the Surface of Rotating Shafts

Abstract

NON-DESTRUCTIVE TESTING (NDT) utilizes the physical properties of a material for detection, location and evaluation of flaws/defects and judging of the microstructure and mechanical properties without damaging the functionality of component being inspected. Flaws or imperfections that are detected by inspection of the component may be obtained by several reasons. It may be due to originality of the material caused by the process used created by some human error or defects initiated during the operating life of components etc. NDT method ranges from the simple to the tangled. NDT is also used for condition monitoring of various components during operation to forecast and assess the rest of the life of components while retaining its structural integrity. Based on availability, accessibility, suitability, analysis and experience the choice of specific method varies. The end result is the saving of time, money and development in precision and reliability of results obtained. There are a vast number of techniques in NDT. Visual inspection testing, liquid penetrate testing, ultrasonic testing, magnetic particle testing, eddy current testing, thermal infrared testing, acoustic emission, leak testing, thermography, instinct metallographic examination. The industrial applications of NDT are mostly found in railways, nuclear, non – nuclear and chemical industries, aircraft and petroleum projects, coal mining industry. This paper presents the knowledge for selection of specific NDT detecting surface flaws and requisite applications. It presents vital aspects in each method along with their advantages and disadvantages.