油气储罐罐壁焊缝静载拉伸检测试验研究*

为建立磁记忆信号与罐体焊接缺陷演变的对应关系，获得以非接触方式检测焊缝处的磁记忆信号来实现对罐体的早期预警和无损检测技术，开展罐壁焊缝试样静载拉伸试验，研究油气储罐在静载拉伸过程中焊缝的磁记忆信号变化规律，并结合有限元模拟仿真进行磁场分布规律的分析。结果表明:磁记忆信号梯度值会在焊缝缺陷处产生突变；随着裂纹深度的增加，磁记忆信号梯度峰峰值呈线性增加，并且峰值随着拉伸载荷的增加而线性增加。

Experimental study on static load tensile testing of weld seam on oil and gas storage tank wall

In order to establish the corresponding relationship between the magnetic memory signals and the evolution of tank welding defects,and to obtain the magnetic memory signals of weld seam with non-contact monitoring,so as to realize the early warning and non-destructive detection technology of tank body,the static load tensile tests of weld seam samples on tank wall were carried out,and the change laws of magnetic memory signals of oil and gas storage tank during the static load tensile process were studied,and the finite element simulation was combined to analyze the distribution of magnetic field.The results showed that the gradient value of magnetic memory signals would have a sudden change at the welding defect.With the increase of crack depth,the peak-to-peak value of magnetic memory signal gradient increased linearly,and the peak value increased linearly with the increase of tensile load.