In order to solve the problems of low detection efficiency, high labor intensity and poor working environment of large pressure vessel cylinder, the pulsed eddy current (PEC) nondestructive testing technology is used to detect the defects in the welding seam of the cylinder. The PEC sensor composed of rectangular probe coil and Hall sensor is installed on the mobile inspection platform to test two simulated cylinder weld samples. Results show that the signal curve of sample 1 without defect is gentle and without mutation, while the signal of sample 2 with defect has three mutation signals. Then, the X-ray testing method is used to detect the sample, radiograph confirmed that there are no defects on sample 1 and three porosity defects in sample 2. Through the comparison and analysis of the above two kinds of detection results, the feasibility of the detection method for weld subsurface defects is verified.

为了解决大型压力容器钢瓶检测效率低，劳动强度大，工作环境差的问题，采用脉冲涡流（PEC）无损检测技术对钢瓶焊缝中的缺陷进行检测。由矩形探针线圈和霍尔传感器组成的PEC传感器安装在移动检查平台上，以测试两个模拟的圆柱焊缝样品。结果表明，无缺陷的样品1的信号曲线平缓且无突变，而有缺陷的样品2的信号具有三个突变信号。然后，使用X射线测试方法对样品进行检测，射线照相证实样品1上没有缺陷，而样品2上没有三个孔隙缺陷。通过对以上两种检测结果的比较和分析，