Oil casing is a high-end product produced by steel pipes. There are many types of casings, and there are many varieties and requirements for casing end buckle types. The machinable buckle types include STC, LC, BC, VAM, and other buckle types. The production and installation process of oil casing involves a lot of testing, mainly as follows:
1. Ultrasonic testing; when ultrasonic waves are transmitted in the tested material, the acoustic characteristics of the material and changes in the internal structure have a certain impact on the transmission of ultrasonic waves. By exploring the degree and status of ultrasonic waves, we can understand the performance and structure of the material change.
2. Radiographic detection; Radiographic detection uses the difference in the amount of radiation transmitted through the normal part and the defect to form a difference in the blackness of the film.
3. Penetration testing; penetrating testing is to use the capillary effect of the liquid to enter the penetrating liquid into the open defect on the surface of the solid material, and then uses the imaging agent to suck the penetrating liquid into the surface to show the existence of the defect.
4. Magnetic particle inspection; Magnetic particle inspection is to use magnetic flux leakage at defects to absorb the magnetic powder and form magnetic marks to provide defect display. It can detect surface and subsurface defects, and the nature of defects is easy to identify.
5. Eddy current testing; eddy current testing mainly uses the eddy current induced by the ferromagnetic coil in the workpiece to analyze the internal quality of the workpiece. It can detect the surface and near-surface defects of various conductive materials, and it is usually difficult to control the parameters.
6. Magnetic flux leakage detection: The magnetic flux leakage detection of oil casing is based on the characteristics of high magnetic permeability of ferromagnetic materials, and the in-service oil casing is detected by measuring the magnetic permeability caused by defects in ferromagnetic materials. quality.
7. Magnetic memory detection: Magnetic memory detection is derived from the connection between the physical nature of the magnetic phenomenon of metals and the dislocation process. It has many advantages such as high efficiency, low cost, and no need for grinding, and has important application prospects in the industry.
Post time: Dec-30-2022