1. Ultrasonic testing
When ultrasonic waves are disseminated in the detected raw materials, the acoustic properties of the raw materials and the transformation of the internal tissue will have a positive impact on the transmission of ultrasonic waves. After detecting the level and conditions of the impact of ultrasonic waves, the function and structure of the raw materials can be understood.

2. Radiographic testing
Radiographic testing uses the difference in the amount of radiation transmitted through the normal part and the defective part to form the resolution of the blackness on the film.

3. Penetration detection
Penetration detection uses the capillary action of the liquid to penetrate the permeated liquid into the defects of the surface of the solid raw material, and then suck the permeated liquid to the surface through the imaging agent to show the existence of the defects. Penetration testing is suitable for all kinds of metal and ceramic workpieces, and the time from penetration operation to the appearance of defects is relatively short, usually about half an hour. It is better to detect surface fatigue, stress corrosion, and welding cracks, and it is better to directly measure the size of the cracks.


4. Magnetic particle detection
Magnetic particle detection is to uses the magnetic leakage at the defect to attract the magnetic powder to form a magnetic mark to provide the defect manifestation. It can detect the defects of the surface and the subsurface. The nature of the shortcomings is easy to distinguish. Paint and electroplated surfaces will not affect the vividness of the detection.