为解决核设施焊缝检测工期紧、检测要求高、传统射线检测技术需要专用时间窗口、无法交叉施工、辐射风险大等问题,提出了使用交流电磁场检测(ACFM)技术检测薄壁不锈钢焊缝中直径约为0. 5 mm的小缺陷。通过理论计算研究了该技术应用于薄壁不锈钢焊缝检测的可行性;运用仿真计算优化探头设计,提高了传统ACFM检测技术的检测精度和稳定性;利用该技术对不同种类、不同尺寸的缺陷进行了检测验证。验证结果表明,针对薄壁不锈钢焊缝,该技术对危害性较大的面积型缺陷可100% 检出,且可检出直径约为0. 4 mm的体积型缺陷。

The weld inspection of nuclear facilities has a short limit time and high acceptance requirements. At the same time, traditional film radiography technology requires a special time window, cannot cross operation and has high radiation risks. To solve these problems, this paper innovatively proposed to use alternating current field measurement (ACFM) technique to detect small defects of about 0. 5 mm in thin-walled stainless steel welds. The feasibility of applying this technology to the detection of thin-walled stainless steel welds was studied through theoretical calculation; the probe design was optimized by simulation calculation to improve the detection accuracy and stability of ACFM. The verification results showed that for thin-walled stainless steel welds, this technology can detect all the more harmful area defects, and the volume defect with a diameter of about 0. 4 mm can be detected.