The basic principle of leakage flux leakage magnetic flux detection is based on the high magnetic permeability of ferromagnetic materials. The magnetic permeability of the thermal grease furnace corrosion defects is much smaller than that of the thermal oil furnace. The oil furnace is magnetized under the action of an external magnetic field. When there is no defect in the heat transfer oil furnace, most of the magnetic lines pass through the steel pipe, and the magnetic lines of force are evenly distributed. When there is a defect inside the elbow, the magnetic lines of force are bent, and some magnetic lines of force leak out. Steel pipe surface. By detecting the leakage flux that escapes from the surface of the magnetized elbow, it is possible to discriminate whether or not the defect exists.
    Regardless of the heat transfer oil furnace, it is still pushing the heat transfer oil furnace. What should it do when it corrodes? How can I detect that it has been corroded? Elbows play an important role and function in certain applications. They need to be maintained and tested during the application process. After the elbows are corroded, the wall of the heat transfer oil furnace is generally thinned, and some pits appear. Pitting.
    The reason and method requirements for the internal corrosion of the heat transfer oil furnace are carried out according to the inevitable method and principle. The corrosion detection methods that can be widely used at home and abroad are the leakage flux method and the ultrasonic wave detection method. Ultrasonic ultrasonic testing is the use of ultrasonic pulse reflection principle to measure the thickness of the pipe wall after corrosion.