高速漏磁检测方法的发展  

Development of high-speed magnetic flux leakage testing method

作　　者：冯搏[1] 伍剑波[2] 邱公喆 康宜华[1] FENG Bo;WU Jianbo;QIU Gongzhe;KANG Yihua(School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]华中科技大学机械科学与工程学院,武汉430074 [2]四川大学机械工程学院,成都610065

出　　处：《无损检测》2021年第2期57-63,共7页Nondestructive Testing

基　　金：中央高校基本科研业务费资助项目(2020kfyXJJS015);国家重大专项(2018YFB0106000);国家自然科学基金面上项目(51875226)。

摘　　要：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,涡流使得管壁内的磁场无法达到稳定状态,从而影响了漏磁检测信号。在机理探究的基础上,提出了增大磁化线圈长度、采用多级磁化等方法来抑制高速漏磁检测时信号的畸变。动生涡流无损检测法和动生涡流热成像检测法等新电磁检测方法也被提出,并在高速检测时获得了较好的效果。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.

关 键 词：高速漏磁检测 磁化滞后 涡流效应 

分 类 号：TG115.28[金属学及工艺—物理冶金]