由于石油石化行业储罐大角焊缝处于特殊位置并且容易产生缺陷，对大角焊缝的检测并没有太有效的方法。用漏磁检测方法对大角焊缝进行检测，利用有限元方法建立大角焊缝模型，分别模拟罐壁板左侧是否余出水平钢板、大角焊缝处有无缺陷以及缺陷存在于焊趾处和角焊缝热影响区时，得到漏磁场相关对比曲线，并对其进行分析得出结论。

Due to the fact that the petroleum and petrochemical tank large fillet weld lies in a special position and easily generates the defects, there is no suitable ways to inspect large fillet weld. In this paper, the magnetic flux leakage (MFL) testing is applied to such large fillet weld testing. Model for MFL testing of large fillet weld was established by finite element method to simulate whether there is a level plate on the left side of the tank wall or not and whether defects exist in large fillet weld or not. When defects exist in weld toe and fillet weld heat affected zone, the curves representing distribution of the MFL field in the above case are obtained and furthermore, subsequent analysis is carried out and conclusion is obtained.