Aircraft magnetic particle detection method

2020 - aircraft magnetic particle testing method 06 - 17 magnetic particle detection is one of the five detection way aviation NDT ( Other have penetrant testing, eddy current testing, ultrasonic testing and radiographic testing) , its magnetic phenomenon is mainly used to detect defects in artifacts, is now widely used in aviation, navigation, automotive, rail, and steel and so on all walks of life. A, main advantages and disadvantages of magnetic particle testing method: magnetic particle testing main advantages are: workpiece defect crack shows obvious directly; High detection sensitivity, needed to go to work can detect tiny crack; Detection from limitation through complex shape of workpiece size; Low cost. But some of the pitfalls of magnetic particle testing also has the corresponding: only applies to ferromagnetic materials; Magnetization is needed after annealing treatment; Using direct current for testing easy ablation artifacts, need careful operators. Magnetic particle detection and other common testing methods and the advantages and disadvantages of contrast is as follows: 2, magnetic particle testing needs of equipment and consumables: aviation magnetic powder detection using basic workshop now wet horizontal magnetic particle inspection way to nondestructive testing (artifacts General aircraft and aircraft parts manual is not allowed to use in magnetic particle testing) , the implementation of magnetic powder inspection needs to have magnetic particle inspection equipment at the same time also need to prepare magnetic particle testing corresponding consumables. Magnetic particle detection device 1. General fixed magnetic particle inspection machine or special magnetic powder flaw detection and semi-automatic machine, chart for some imported brands of magnetic machine. 2. Demagnetization device ( Part of the magnetic machine itself have demagnetization function) Magnetic particle testing consumables magnetic powder ( The fluorescent magnetic powder and the fluorescent magnetic powder) Magnetic suspension liquid ( A small amount of liquid and magnetic powder) Magnetic particle inspection (block, Artificial defect standard test block and block two) of the defect Three, magnetic particle testing process: the implementation of magnetic particle testing of workpiece, due process as shown in the figure below: four, the application of magnetic particle testing in civil aviation maintenance magnetic particle testing application in civil aviation maintenance mainly in plane some big parts in overhaul after decomposition, examination is the main defect of fatigue cracking and stress corrosion cracking. According to the plane of artifact types mainly include; Tube, shaft, rod, rod class testing; Gear bearing parts inspection, all kinds of roller gear CAM handwheel all kinds of bearing sleeve nut etc. The other common parts; Disc class workpiece detection, such as aircraft brake plate torque tube; Detection of coated layer at the surface of the workpiece. According to the application of aircraft parts mainly include: wheel screw detection; The brake torque tube detection; The brake pressure plate test; The landing gear overhaul inspection; Special parts inspection; Parts of in situ detection. At home with the development of China's civil aviation civil aviation maintenance enterprises demand for NDT is also more and more big, more and more civil aviation enterprises in development and improve their ability of magnetic particle testing, and other as a magnetic particle inspection work in civil aviation maintenance workers also hope that the general aviation maintenance workers in the field of nondestructive testing some more knowledge and understanding. （ Source: WeChat public number 'AERO - 专家”)