美国无损检测学会无损检测技术简介课件.ppt

Introduction to Nondestructive Testing Outline Introduction to NDT Overview of Six Most Common NDT Methods Selected Applications Methods of NDT Visual What are Some Uses of NDE Methods? Flaw Detection and Evaluation Leak Detection Location Determination Dimensional Measurements Structure and Microstructure Characterization Estimation of Mechanical and Physical Properties Stress (Strain) and Dynamic Response Measurements Material Sorting and Chemical Composition Determination When are NDE Methods Used? To assist in product development To screen or sort incoming materials To monitor, improve or control manufacturing processes To verify proper processing such as heat treating To verify proper assembly To inspect for in-service damage Six Most Common NDT Methods Magnetic Particle Inspection The part is magnetized. Finely milled iron particles coated with a dye pigment are then applied to the specimen. These particles are attracted to magnetic flux leakage fields and will cluster to form an indication directly over the discontinuity. This indication can be visually detected under proper lighting conditions. Magnetic Particle Crack Indications Radiography Film Radiography Radiographic Images Eddy Current Testing Eddy Current Testing Ultrasonic Inspection (Pulse-Echo) Ultrasonic Imaging Common Application of NDT Inspection of Raw Products Inspection Following Secondary Processing In-Services Damage Inspection Inspection of Raw Products Forgings, Castings, Extrusions, etc. Inspection Following Secondary Processing Machining Welding Grinding Heat treating Plating etc. Inspection For In-Service Damage Cracking Corrosion Erosion/Wear Heat Damage etc. Power Plant Inspection Wire Rope Inspection Storage Tank Inspection Aircraft Inspection Jet Engine Inspection Pressure Vessel Inspection Rail Inspection Bridge Inspection Special Measurements Boeing employees in Philadelphia were given the privilege of evaluating the Liberty Bell for damage using NDT techniques.