What are the detection methods for oil casing? Let's take a brief look:

1. Ultrasonic detection When ultrasonic waves are propagated in the material being tested, the acoustic characteristics of the material and the changes in the internal structure have a certain impact on the propagation of ultrasonic waves. By detecting the degree and situation of the impact of ultrasonic waves, the changes in the function and structure of the material can be understood.

2. Radiographic detection Radiographic detection uses the difference in the amount of radiation transmitted between the normal part and the defect to form the discrimination of the blackness on the film.

3. Penetrant detection Penetrant detection uses the capillary action of the liquid to penetrate the open defect on the surface of the solid material, and then absorbs the penetrated penetrant through the developer to show the existence of the defect. Penetrant detection is suitable for various metal and ceramic workpieces, and the time from penetration operation to defect appearance is relatively short, usually about half an hour. It can detect surface fatigue, stress corrosion and welding cracks, and can directly measure the size of the cracks.
4. Magnetic Particle Testing Magnetic particle testing uses magnetic leakage at defects to absorb magnetic powder and form magnetic traces to provide defect display. It can detect surface and sub-surface defects. The nature of defects is easy to distinguish. Paint and electroplating surfaces do not affect the detection accuracy.

5. Eddy Current Testing Eddy current testing mainly uses eddy currents induced by ferromagnetic coils in the workpiece to analyze the quality of the workpiece. It can detect surface and near-surface defects of various conductive materials. The usual parameter control is complicated, the detection results are difficult to explain, and the detection object must be a conductive crack, and the defect length can be measured euphemistically.

6. Magnetic Leakage Testing Magnetic leakage testing of oil casing is based on the high magnetic permeability characteristics of ferromagnetic materials. It detects the quality of in-service oil casing by measuring the magnetic permeability changes caused by defects in ferromagnetic materials.

7. Magnetic Impression Testing Magnetic impression testing is based on the relationship between the physical nature of metal magnetic phenomena and dislocation processes. It has many advantages such as high utilization rate, low cost, and no need for polishing. It has important and ordinary application prospects in the industry.
The above are the detection methods for oil casing. You are welcome to consult and purchase.
To learn more, please visit the website:
https://www.nan-steel.com/octg/casing-pipe.html