Steel pipe flaw detection and reliability analysis

　　Discussing the reliability of MFT,ET,UT and EMAT several nondestruction detection methods in flaw detection, Based on the comparison of the above mentioned several methods of reliability is can be seen,EMAT has advantages and broad prospect that the other nondestruction detection methods have not.

　　1.General

　　Steel pipe is the most widely used varieties of steel. Its quality directly affects the economic benefits and the safety of personnel. All countries in the world have paid much attention to  pipe quality detection ,used a variety of nondestructive testing ( NDT ) methods to inspect steel pipe strictly.

　　2.The reliability of MFL（Magnetic Flux Leakage) method

　　A number of factors affect MFL detection and characterization accuracy. These factors can be grouped in five areas:

　　1)Magnetization: the relationships between the magnetization system, the pipe material, and the applied flux field.

　　2)Leakage: the relationships between the applied flux field, the anomaly, and the leakage field.

　　3)Measurement: the relationships between the leakage field, the sensor, and the measured signal.

　　4)Recording and display: the impact of recording resolution and playback methodologies.

　　5)Analysis: the process used to classify anomaly types and characterize metal-loss geometries from the measured signal.

　　The output or results of each area affects the input and results of the next area. In addition, all five of these areas have theoretical capabilities and limitations. In designing commercial MFL inspection systems, inspection tool designers try to reach these limits within economic constraints.

　　We have adopted advanced production equipment and technologies to manufacture our erw pipe and spiral steel , which can not only improve product quality, but also save raw materials. Our products have high strength, good toughness and resistance to corrosion.