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压力管道自动超声成像检测技术 总被引:3,自引:0,他引:3
介绍研制的自动化超声成像检测设备的特点,以及该技术在压力管道检测中的应用,讨论该技术在应用过程中需要解决的几个重要问题。实践证明该技术具有推广应用价值。 相似文献
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近年来随着机电一体化系统的发展,与射线透照相比,半自动和全自动管道超声波检测系统的应用日益增多。实现计算机控制,通过处理收集的信息信号的各种算法,提供了在二维乃至三维图像中显示检查信息的可能性。本文综述工业油气管道超声检测系统及其应用,评述其功能和局限性以及相关法规标准和技术要领,旨在为承压设备数字化、规范化、高效高质无损检测提供有用借鉴。 相似文献
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分析了衬里复合材料的检测难点,基于相控阵AUT(自动超声检测)技术,制作了一系列焊接缺陷,并对比分析缺陷的AUT检测结果与缺陷宏观切片结果,评估AUT对于不同位置缺陷的检出率及缺陷定量精度,验证了衬里复合材料焊缝AUT检测的可靠性。 相似文献
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海底管道小管径焊缝主要采用射线方法进行检测,而射线检测存在辐射危害,检测效率较低,逐渐成为制约海管铺设效率提升的关键因素。结合直径50 mm海底管道焊缝检测特点及标准要求,设计了相应的相控阵超声检测方案,完成了缺陷高度定量精度及检出率分析,实现了直径50 mm海底管道焊缝的相控阵超声检测。试验结果表明,该技术可替代传统射线检测,有效提高海管铺设检验效率。 相似文献
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应用于海底管道焊缝检测的全自动超声检测(AUT)工艺需进行工艺认证。结合海底管道不锈钢复合管焊缝的AUT检测工艺应用需求,从工艺的可重复性、上下游对称性、轨道上下游偏移及检出率等方面进行试验认证,获得了理想的试验结果,满足标准要求,可为工程项目的应用提供保障。 相似文献
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随着TMCP技术的发展,通过合理设计合金元素含量和在线快冷工艺,可实现相变强化、细晶强化和亚晶强化,从而实现热轧卷板强度、塑性、韧性和可焊性的良好匹配。考虑到特殊品种结构对超快层流冷却速率的要求,太钢对2 250 mm热轧生产线层流冷却区域进行了全线加密设备改造,通过采用密集快冷卷取温度控制技术,实现了高强度管线钢的减量化生产。 相似文献
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对铝板带箔轧制油添加剂的要求及选择作了简要描述,说明了轧制油添加剂含量对轧制生产的影响,详细介绍了不需要昂贵设备、简单易操作的测定添加剂含量的方法. 相似文献
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An important requirement in the thermographic nondestructive evaluation is the identification of actual sound zone or the base line with which the defective areas are compared to determine the actual temperature contrast and the corresponding defect severity. In a part under inspection, the actual sound zone is not known a priori and various approximations have been used in the past to serve as this unknown base line. Determination of actual sound zone in a defective test object is still a challenge. A related issue before the identification of this base line pixel is in the elimination of non-uniformity in the temperature distribution across the specimen surface which is unrelated to the actual defects. This spurious contrast is often introduced by the limitations of the instrumentation or the test procedure and it has to be eliminated before pixels in the sound zone can be located. This paper presents an automated procedure for simultaneously eliminating spurious contrast and locating sound zone pixels, directly from experimental data in a thermographic nondestructive evaluation. Location of actual sound zone pixels facilitates accurate thermal contrast computations, extraction of thermal properties such as break time and thermal diffusivity. In addition, based on the actual sound zone temperature profile it is possible to normalize experimental thermographic results in such a way that they can be directly correlated with results from numerical simulations. 相似文献
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V. T. Portman R. D. Weill V. G. Shuster Y. L. Rubenchik 《International Journal of Machine Tools and Manufacture》2003,43(10):930
An application of the linear programming (LP) approach to form and position accuracy assessments based on the minimum zone (MinZ) method is considered. The standard form of the optimization function and constraints using linearized form of the substitute feature is considered. A linearization-caused error is estimated by reference to the second order terms within the Taylor series expansion of the rotation matrix. The acceptable range of the LP-based assessments is defined for some levels of an allowable error. The LP-based assessment for a surface is simulated. Actual measurements show that the LP-based estimations have equal or fewer values in comparison with those obtained by other methods. 相似文献
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Methods of arc length control and risual image based weld detection for precision pulse TIG welding were investigated. With a particular all-hardware circuit, arc voltage during peak current stage is sampled and integrated to indicate arc length, deviation of are length and adjusting parameters are calculated and output to drive a step motor directly.According to the features of welding image grabbed with CCD camera, a special algorithm was developed to detect the central line of weld fast and accurately. Then an application system were established, whose static arc length error is 0. 1 mm with 20 A average current and 1 mm given arc length, static detection precision of weld is 0. 01 mm, processing time of each image is less than 120 ms. Precision pulse TIG welding of some given thin stainless steel components with complicated curved surface was successfully realized. 相似文献