Definition of NDE
NDE: non-destructive examination
Macroscopic and microscopic defect detection shall be carried out on the inspected object by physical means when its performance does not change and affect. And then evaluate the integrity of a material, component or structure or quantitatively measure some characteristic of the inspected object.
Several Methods of NDE
1. RT radiographic testing
2. MT magnetic particle testing
3. PT penetrant testing
4. ET eddy current testing
5. UT ultrasonic testing
What are the uses of NDE?
1. Flaw detection and evaluation
2. Leak detection
3. Location determination
4. Dimensional measurements
5. Structure and microstructure characterization
6. Estimation of mechanical and physical properties
7. Stress(strain) and dynamic response measurements
8. Material sorting and chemical composition determination
When to do NDE ?
1. At almost any stage in the production or life cycle of a component.
2. Assisting in product development
3. To choose or sort incoming materials
4. To control manufacturing processes
5. Inspecting heat treating
6. Testing for in-service damage
Characteristic of NDE
1. Do not destroy the inspected object
2. 100% inspection
3. Identify defects and evaluate the quality of the inspected object
4. Be able to judge the causes of defects and promote relevant departments to improve production processes and product quality
5. Regularly inspect key components during operation to prevent accidents.
