核电厂管道射线插塞焊缝的无损检测

来源 :无损检测 | 被引量 : 0次 | 上传用户:zhilong217
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
核电厂一回路、二回路系统管道如主管道、主给水管道、主蒸汽管道等安装有大量射线插塞,其同属于回路高温高压核压力边界,主要用于管道环焊缝的定期射线在役检查.针对插塞失效情况,制定了一个磁粉检测、渗透检测以及相控阵超声检测相结合的无损检测方案,并利用该方案对射线插塞进行检测.检测结果表明,对于射线插塞角焊缝及密封焊缝,采用单一方法实施检测均有可能造成特定缺陷的漏检.因此,密封焊缝应采用液体渗透检测法进行检测,角焊缝应采用相控阵超声与磁粉检测相结合的方式实施检测.
其他文献
The processing capability is vital for the wide appli-cations of materials to forge structures as-demand.Graphene-based macroscopic materials have shown excellent mechanical and func-tional properties.However,different from usual polymers and met-als,grap
The recombination loss of photo-carriers in photocatalytic systems fatally determines the energy conversion efficiency of photocata-lysts.In this work,an electrostatic field was used to inhibit the recom-bination of photo-carriers in photocatalysts by sep
Two-dimensional (2D) MXenes are promising as electrode materials for energy storage,owing to their high electronic conductivity and low diffusion bar-rier.Unfortunately,similar to most 2D materials,MXene nanosheets easily restack during the electrode prep
Boron nitride (BN) aerogels,composed of nanoscale BN building units together with plenty of air in between these nanoscale building units,are ultralight ceramic materials with excellent thermal/electrical insulation,great chemical stability and high-tempe
参考国际最新标准,对双全法(全矩阵捕获和全聚焦法)检测焊缝典型缺陷图谱进行解读,并总结出一条读谱要领:“明双全原理;悉成像路径;谙仿真建模;识真伪显示”,意在为提高相控阵超声双全法检测技术提供有用借鉴.
Some precision electronics such as signal transmitters need to not only emit effective signal but also be protected from the external electromagnetic (EM) waves.Thus,directional electromagnetic interference (EMI) shielding materials (i.e.,when the EM wave
Lightweight,high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for address-ing the challenge of ever-increasing electromagnetic pollution.Lightweight lay-ered foam/film PVDF nanocomposite
Constructing heterojunction is an effec-tive strategy to develop high-performance non-precious-metal-based catalysts for electrochemical water splitting(WS).Herein,we design and prepare an N-doped-car-bon-encapsulated Ni/MoO2 nano-needle with three-phase
针对表面裂纹深度和取向的无损表征难题,提出一种基于临界折射纵波(L CR)的检测方法.以碳钢试块表面垂直裂纹(深度为1~8 mm)、倾斜裂纹(长度为10 mm,倾角为15°~90°)为检测对象进行试验,分析了裂纹深度、取向对L CR波信号的影响规律,通过信号幅值和B扫描成像表征裂纹.试验结果表明,L CR波在传播过程中会受到表面裂纹的遮挡作用,并在裂纹尖端产生衍射.随裂纹深度增加,遮挡作用增强,透射L CR波幅值下降且到达时刻延后,对裂纹取向不敏感;B扫描图像中L CR波及对应尖端衍射波的位置、方向与裂纹
目前电磁超声在测厚、无损检测等领域得到了广泛的研究,但在螺栓轴向应力测量方面的研究较少,为了促进电磁超声在螺栓轴向应力测量中的应用,通过建立多物理场有限元仿真模拟了电磁超声的激发、传播过程.建立螺栓二维模型,利用电磁超声激发超声波得到了纵波在螺栓内部传播的信号;通过有限元模拟,得到了螺栓在轴向载荷作用下内部的应力分布.有限元计算表明轴向载荷和声时差存在一定的线性关系,该线性关系受到轴向载荷的影响;不同的夹紧长度会影响材料的应力系数,而夹紧长度和应力系数的乘积为定值.试验结果表明,有限元模拟结果与真实试验情