针对目前采用的超声检测法对衬里层背侧裂纹检测时,检测效率不高且易漏检的现状,采用友联PXUT-350C型便携式超声探伤仪、2.5P13×13K1的纵波探头,对自行设计制作的8 mm厚的316 Mod尿素级不锈钢板的人工模拟缺陷试块进行了超声波探伤的实验研究。结果表明,超声探伤对深度为0.5 mm以上的缺陷比较敏感,缺陷回波的高度与缺陷深度成正比。该实验的成功为衬里层背侧裂纹的快速检测技术的形成奠定了实验基础。 Aiming at the current situation that the ultrasonic testing method used to detect the crack of the back side of the lining layer is not efficient and easy to undetected, a portable ultrasonic flaw detector of PXUT-350C and a longitudinal wave probe of 2.5P13 × 13K1 The 8 mm thick 316 Mod urea-based stainless steel artificial simulated defect test block was tested by ultrasonic flaw detection. The results show that ultrasonic flaw detection is sensitive to the depth of 0.5 mm or more, and the height of defect echo is proportional to the depth of defect. The success of this experiment laid the experimental foundation for the formation of the rapid detection technique of the backside crack in the lining layer.