中文摘要：

介绍现有复合磁化漏磁检测方法与装置并分析其局限性：相对螺旋推进的扫查探伤方式限制探伤速度,也难以完成不宜作旋转运动或带直线焊缝的钢管的检测。针对此问题,通过有限元仿真和试验的方法,发现并证实单一轴向磁化下检测钢管上任意方向伤的可能性,尤其是探测钢管上平行于轴向磁感应场的纵向伤的可行性,使得相对直线扫查的探伤成为可能。研究在单一轴向磁化下钢管上纵、横向伤检测信号的特征及其归一化判断;提出一种无需检测探头或钢管旋转的漏磁检测方法并研制出相应的探伤装置,解决无缝钢管生产线上的高速或超高速探伤问题,尤其是自身难以作螺旋推进运动的如连续油管等钢管及焊缝管的直线焊缝上缺陷的快速探伤;同时简化统一传统漏磁检测方法,降低设备成本。

英文摘要：

The existing magnetic flux leakage（MFL） method and apparatus by combined magnetization is presented and its limitations are also analyzed.The helical scanning approach limits the testing speed and does not suit the inspection of pipes unsuitable to rotate or with straight line weld.Afterwards,for the deficiencies,the feasibility of omni-directional defects MFL inspection under a unidirectional axial magnetization for steel pipe is found and verified by simulation of finite element model and experiments,particularly the feasibility of longitudinal cracks parallel to the axial magnetization,thus it is possible to realize testing by linear scanning.A method for ensuring the consistency of evaluation and testing for the defects in a same volume but different directions is also put forward.A MFL method and apparatus without needing a rotation of detection probes or steel pipe are developed and designed,thus resolving the problems of high-speed or ultra-high-speed inspection of seamless steel pipe and adapting to the inspection of pipes unsuitable to move helically or with straight line weld.The proposed method simplifies the conventional MFL method and reduces the cost of the testing apparatus.