T23钢水冷壁管焊缝横向裂纹超声检测研究

发布时间：2018-07-08 07:42

本文选题：水冷壁管 + 焊缝横向裂纹　；参考：《华东理工大学》2017年硕士论文

【摘要】：锅炉水冷管壁广泛地应用于核电、火电等行业,其焊缝质量的好坏直接影响在役锅炉设备及系统的安全性。T23钢锅炉水冷管壁环焊缝上横向裂纹的检测由于现场条件及缺陷位置等原因,没有很合适的检测方法,给检修带来了一定的困难。本文旨在对锅炉水冷管壁横向裂纹的超声检测进行基础性研究,在不对焊缝余高进行处理的前提下,通过焊缝横向裂纹的各种超声检测方法(斜平行扫查法、双探头跨焊缝检测法、TOFD方法)探索工程中有效可靠的超声检测手段。通过各种检测方法的仿真和试验研究,证明双探头跨焊缝检测法具有较高的检测灵敏度和检测精度,其效果优于其他两种方法。实现了双探头跨焊缝扫查成像,得出其最佳的检测偏心角范围为40-50°,并据此参数设计了专用探头的三维模型。
[Abstract]:Boiler water-cooled pipe wall is widely used in nuclear power, thermal power and other industries, The quality of weld seam directly affects the safety of boiler equipment and system in service. The detection of transverse cracks on the circumferential weld of water-cooled pipe wall of T23 steel boiler is not suitable because of the site conditions and defect position. It brings some difficulties to the maintenance. The purpose of this paper is to carry out basic research on ultrasonic detection of transverse cracks in boiler water-cooled pipe wall. On the premise of not treating the remaining height of weld seam, the ultrasonic detection method of transverse crack of weld seam (oblique parallel scanning method) is adopted. Two-probe cross-weld detection method (TOFD method) to explore the effective and reliable means of ultrasonic detection in engineering. Through the simulation and experimental study of various detection methods, it is proved that the dual-probe cross-weld detection method has higher detection sensitivity and accuracy, and its effect is better than the other two methods. The scanning imaging of cross weld seam with two probes is realized, and the optimum detection eccentric angle range is 40-50 掳. According to the parameters, the 3D model of the special probe is designed.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TK226;TB559

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