1. Ultrasonic Testing
When ultrasonic waves travel through the material being tested, the acoustic properties and internal structural changes of the material affect the propagation of these waves. By detecting the degree and nature of this impact, we can assess the function and structure of the raw materials.
2. Radiographic Testing
Radiographic testing determines the blackness of the film by utilizing the differences in radiation transmission between normal and defective parts. This method allows for the identification of internal defects based on varying radiation absorption levels.
3. Penetration Testing
Penetration testing leverages the capillary action of liquids to detect surface defects. The penetrant liquid seeps into open surface flaws in the material, and then an imaging agent draws the penetrant out, making the defects visible. This method is suitable for various metals and ceramic workpieces, with a quick turnaround time of about half an hour. It can detect surface fatigue, stress corrosion, and welding cracks, and allows for direct measurement of crack sizes.
4. Magnetic Particle Testing
Magnetic particle testing detects defects by using magnetic flux leakage to attract magnetic particles, forming visible magnetic traces. This method can identify both surface and sub-surface defects, with the nature of the defects being easily identifiable. The presence of paint or electroplated surfaces does not affect the detection's clarity.
