不锈钢对接焊缝DR检测仿真与缺陷检出概率分析

Simulation of DR and Probability of Defect Detection Analysis for Stainless Steel Butt Welds

  • 摘要: 针对核电焊缝数字化射线检测的需求,利用CIVA仿真软件,建立了不锈钢对接焊缝典型缺陷射线检测仿真模型,分别开展了球型缺陷、线型缺陷胶片照相检测和DR检测仿真试验及缺陷检出概率分析。仿真试验结果表明:胶片照相检测在a90/95水平下可检出的球型缺陷最小直径为0.35mm,可检出长度为1mm、宽度为0.2mm的线型缺陷最小深度为0.286mm,DR检测(2倍成像)在a90/95水平下可检出的球型缺陷最小直径为0.412mm,可检出长度为1mm、宽度为0.2mm的线型缺陷最小深度为0.188mm。DR检测(2倍成像)对球型缺陷检出能力略低于胶片照相检测,对线型缺陷检出能力优于胶片照相检测。开展真实对接焊缝DR检测试验,气孔缺陷检测结果与仿真结果一致,试验数据能够用于指导核电焊缝DR检测推广应用。

     

    Abstract: In response to the demand for digital radiographic testing of nuclear power welds, a simulation model for the radiographic testing of typical defects in stainless steel butt welds was established using the CIVA simulation software. Simulation experiments and probability of detection (POD) analysis were conducted for film radiography testing of spherical defects and linear defects, as well as digital radiography (DR) testing. The simulation test results showed that the minimum detectable diameter of spherical defects by film radiography was 0.35mm at a probability of 90% and giving 95% confident level, and the minimum depth of linear defects with a length of 1mm and a width of 0.2mm that could be detected was 0.286mm. The minimum detectable diameter of spherical defects was 0.412mm at a probability of 90% and giving 95% confident level, and the minimum depth of linear defects with a length of 1mm and a width of 0.2mm that could be detected was 0.188mm. DR detection (2x imaging) had slightly lower ability to detect spherical defects than film radiography, and better ability to detect linear defects than film radiography. Real butt weld DR testing was conducted, and the results of pore defect detection were consistent with the simulation results, the test data can be used to guide the promotion and application of DR testing for nuclear power welds.

     

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