The advantages of ultrasonic testing of large-diameter flanges are large thickness, high sensitivity, fast speed, low cost, harmless to the human body, and the ability to locate and quantify defects. The display of defects by ultrasonic flaw detection is not intuitive, the flaw detection technology is difficult, and it is easily affected by subjective and objective factors.
The advantages of ultrasonic testing of large diameter flanges are
And the flaw detection results are not easy to save. Ultrasonic testing requires a smooth working surface. It requires experienced inspectors to distinguish defect types and is suitable for inspection of thicker parts, so ultrasonic flaw detection also has its limitations.
The advantages of ultrasonic testing of large diameter flanges are
Secondly, the basic principle of leakage flux detection is based on the high magnetic permeability of ferromagnetic materials. The magnetic permeability at the corrosion defect of the large-diameter flange is much smaller than that of the flange. It is magnetized under the action of a magnetic field. When there are no defects in the flange, most of the magnetic force lines pass through the steel pipe, and the magnetic force lines are evenly distributed at this time; when there are defects inside the flange, the magnetic force lines bend and some of the magnetic force lines leak out of the steel pipe. The existence of defects can be judged by detecting the leakage flux escaping from the surface of the magnetized large-diameter flange.
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