Penetration testing is a widely used nondestructive testing method, which has the advantages of high sensitivity and simple operation.

The specific steps include 1, surface treatment of the inspected workpiece, generally grinding or solvent cleaning;

2. Apply penetrant; Spraying, brushing, soaking, etc. can be used, and the soaking time is generally 10 minute or according to the instructions of penetrant;

3. Remove excess penetrant, generally wipe it with a rag, pay attention to one-way wiping, and the rag should not be depilated;

4. Generally, the developer is applied by spraying, which should be uniform, not too thick and cannot be applied repeatedly;

5. The defects are evaluated after a certain period of time, usually 5-60 minutes.

* * * * * penetrant flaw detection is mainly used to detect surface opening defects of workpieces. *********