高速漏磁检测方法的发展

漏磁检测法已成功应用于各类铁磁性材料的检测中,但当代生产技术的革新和新应用领域的出现对漏磁检测法的检测速度提出了新的挑战.高速漏磁检测的信号出现畸变,制约着检测速度的进一步提高.对此,众多研究人员对信号畸变的机理进行研究,发现磁化滞后效应是影响高速漏磁检测信号的主要因素.当高速运动的钢管通过磁化线圈时,涡流使得管壁内的...

Development of high-speed magnetic flux leakage testing method

Magnetic flux leakage(MFL)testing method has been successfully applied in the inspection of various ferromagnetic materials.However,the development of modern manufacturing technology and new application areas brought new challenges in the testing speed of MFL testing.The distortion of MFL signals in high speed testing limits the testing speed.Therefore,many researchers studied the mechanism of signal distortion and found that the time-lag in magnetization was the main reason to affect the MFL signal.When the steel pipe passing through the magnetizing coil at a high speed,the eddy current will influence the magnetization of pipe wall and further influence the MFL signal.Based on the mechanism study,methods such as increasing coil length and using multi-stage magnetization have been proposed to reduce the distortion of MFL signals at high speed.Velocity induced eddy current testing method and velocity induced eddy current thermography have also been proposed and achieved good results in high speed testing.