Non-Destructive Testing (NDT) refers to an array of inspection methods that allow inspectors to evaluate materials, components, or assemblies to determine discontinuities or differences without causing damage to the original part. The objective of NDT is to ensure product integrity and reliability, control production processes, reduce production costs, and maintain a constant quality level. Most industries use NDT, including Oil Gas, Power Generation, Chemicals, Mining, Aerospace, Automotive, and Maritime. Magnetic Particle Inspection (MPI) detects surface and near-surface flaws in ferromagnetic materials by running a magnetic current through them. The types of defects it can ascertain include cracking, pores, cold lap, lack of sidewall fusion in welds, etc. Multifaceted techniques used for Magnetic Particle Inspection are 110v AC handheld electromagnetic yoke magnet, a white strippable paint as a contrasting background, and a magnetic “ink” composed of iron powder particles in a liquid carrier base. Magnetic Particle Inspection (MPI) and Non-Destructive Testing (NDT) are indispensable parts of the manufacturing process as they help manage quality, lower production costs, and identify the root causes of product defects.
NDT
NDT techniques are suitable for all types of inspections. The most frequently used test methods in NDT include Visual Testing (VT), Ultrasonic NDT (UT), Radiography NDT (RT), Magnetic Particle Testing (MT), Leak Testing (LT), Liquid Penetrate Testing (PT), and Electromagnetic Testing (ET). Measurements and testing methods vary according to the component. Drones equipped with cameras have become another tool used in NDT for collecting visual data. One of the key benefits of using NDT is that the pieces tested in the industry are left undamaged by the process. It is a safe testing method for operators, an accurate way of inspection as the test is repeatable, the methods are economical, and the quality of the output is assured, etc.
Magnetic Particle Inspection
Magnetic Particle Inspection (MPI) is used extensively on welded fabrications in magnetic material, castings, and for locating fatigue cracks in items subject to cyclical stress. Magnetic Particle Inspection applies to all metals which can be strongly magnetized. The advantages of magnetic particle inspection include portability, speed, affordability, immediate results, detection of surface and near-surface flaws, testing up to 300°C using dry powder, low cost, and the ability to check parts with irregular forms etc. Testing welds, castings, tools, bar stock, and other components for quality control, surface integrity, code adherence, and pre-machine screening are a few applications of magnetic particle inspection.
