对接焊缝缺陷漏磁场特征分析及识别研究  

Characteristic Analysis and Recognition of Magnetic Flux Leakage Field of Butt Weld Defects

作　　者：戴光[1] 崔巍[1] 杨志军[1] 陈志华[1] 孙立强[1] 

机构地区：[1]东北石油大学机械科学与工程学院

出　　处：《中国安全科学学报》2011年第10期82-88,共7页China Safety Science Journal

基　　金：黑龙江省教育厅科学技术研究重点项目(2511008)

摘　　要：为实现钢板对接焊缝存在不同类型缺陷的识别研究,针对铁磁性焊缝的特点,探讨应用漏磁法检测钢板对接焊缝不同类型缺陷。根据漏磁检测(MFL)原理,采用有限元方法(FEM),分别建立钢板对接焊缝中可能存在的裂纹、气孔、未熔合和未焊透等缺陷的三维FEM模型。研究钢板对接焊缝包含以上不同类型缺陷时所产生的漏磁场分布特征,得到漏磁场磁感应强度水平分量和垂直分量相关对比分析曲线。仿真结果表明:漏磁法适用于钢板对接焊缝缺陷的识别研究;根据漏磁场磁感应强度分量的曲线特征,能够实现对焊缝缺陷的分类。In order to realize the recognition of different types of defects existing in butt welds in steel plates, magnetic flux leakage （MFL） method was used to detect different types of butt weld defects in steel plates with consideration on the characteristics of ferromagnetic weld. According to the principle of MFL testing, 3D finite element method （FEM） models were established by using FEM numerical simulation for such defects as crack, stoma, incomplete fusion and incomplete penetration, respectively. Meanwhile, the distributing characteristics of magnetic flux leakage field for the above different types of butt weld defects in steel plate were studied, and the contrastive curves of horizontal component and vertical component of the magnetic induction density of magnetic flux leakage field were obtained. The results indicate that MFL method is suitable for the recognition study of butt weld defects of steel plates; also the classification of weld defects can be realized according to the curves of characteristics of component of the magnetic induction density of magnetic flux leakage field. This study provides theoretical basis for follow-up quantitative evaluation of weld defects.

关 键 词：对接焊缝 漏磁场特征 识别研究 裂纹 气孔 

分 类 号：X941[环境科学与工程—安全科学]