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本文介绍了超声波探伤和磁粉探伤两种无损检测技术的工作原理、特点,在轧辊质量跟踪检测中的应用及取得的效果。 相似文献
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超声波探伤法做为一种检查轧辊内部缺陷的无损检测方法,在控制热轧复合工作辊结合层失效方面有着较其它无损检测方法无可比拟的优越性.实现超声波探伤在控制热轧工作辊结合层失效方面的过程跟踪应用,可以最大限度地实现上机轧辊安全无事故,最大限度地减小轧辊事故损失,从而实现轧辊的可靠使用. 相似文献
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介绍了在线超声波无损探伤检测设备实际应用中,由于实际机械设备的精度和相关影响因素造成的漏误报现象。在不增添电子屏蔽控制的情况下,通过合理组合和运用超声波探伤仪器的实际能力,消除或减少干扰源对设备的影响,降低了探伤设备误报率,使探伤的误报率不超过0.1%。 相似文献
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无损检测是产品质量控制的重要手段。冶金部钢材无损检测工作,从六十年代初,针对军用钢材质量问题开展了超声波探伤。多年来,在部领导的指示下,钢材无损检测得到了发展。十一届三中全会以后,六五期间进展较快,特别是近几年,中央领导一 相似文献
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当前我国很多高科技产品都广泛应用钢结构,他对我们人的正常工作和生活起到了非常重要的作用,但为了保证其质量,必须要通过相关的检测技术来保证其安全稳定。本文结合笔者工作经验,分析了钢结构无损检测中超声波探伤技术的应用情况,为今后更好的进行无损检测提供参考与借鉴。 相似文献
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由中国科学院武汉物理与数学研究所控股的中科创新公司研制的一种新型数字式超声波探伤仪,日前获得国家发明专利。该技术的早期产品在1992年曾获得国家级新产品奖,本次获得发明专利的数字式超声波探伤仪涉及无损检测中的超声波探伤技术,尤其涉及一种超声波探伤仪的数字采样技术。超声波传播可以穿透物质结构而不损伤物质本身,是一种无损探伤手段,广泛应用于冶金、化工、交通、航天航空、水下、医疗等领域。 相似文献
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Nondestructive testing techniques have been historically and commonly used to evaluate the quality of existing concrete structures. Several traditional nondestructive testing techniques were applied to the pier caps of the Quebec Street Bridge over Air Lawn Road, constructed in 1971, which is located in Denver, Colorado. The techniques utilized included visual inspection, hammer sounding, Schmidt hammer rebounding, and ultrasonic pulse velocity testing, including tomographic imaging. Results of the nondestructive tests were used to determine areas to be tested with local destructive tests. These tests included concrete compressive strengths, chloride testing, and petrographic testing. This paper presents the application and interpretation of common nondestructive testing techniques and the consequent repair, rehabilitation, and maintenance decisions. The overall results indicate that inside cores of all the pier caps are healthy, sound concrete. On all of the pier caps, extensive exterior concrete layer rehabilitation needed to be completed. 相似文献
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在线无损检测是探伤生产线的重要检测手段,在保证石钢公司钢材产品出厂质量方面起到了不可替代的作用。重点介绍了阵列涡流和相控阵超声两种无损检测方式在实际检测中遇到的技术问题和采取的改进措施。改进后,无损检测技术满足了客户的需求。 相似文献
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A. I. Ul'yanov G. V. Sterkhov V. S. Korobeinikova V. G. Ermolaev N. A. Sidorov 《Powder Metallurgy and Metal Ceramics》1985,24(8):648-652
Conclusions To eliminate scrap for hardness of parts of sintered 30NM steel after hardening and low-temperature tempering of them with possible variations in carbon content of the material, the following conditions are necessary: nondestructive testing and inspection of parts after sintering for carbon content by the method of measurement of their coercive force. If necessary measurement of the density of the parts after sintering using the saturation magnetization is possible; nondestructive testing and inspection of the hardened parts based on hardness by measurement of their coercive force. In some cases prediction of the hardness after hardening and low-temperature tempering using the results of measurement of the coercive force of hardened parts is possible.Translated from Poroshkovaya Metallurgiya, No. 8 (272), pp. 75–80, August, 1985. 相似文献
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M. D. Mathew P. Palanichamy S. Latha T. Jayakumar K. Bhanu Sankara Rao S. L. Mannan Baldev Raj 《Transactions of the Indian Institute of Metals》2010,63(2-3):449-452
Alloy 625 exposed to 60,000 hours of service was re- solution annealed at 1433 K and thermally aged at various temperatures in the range of 923–1123 K to produce different microstructures. The microstructures were characterised using scanning electron microscope. Tensile properties and hardness were determined using nondestructive ball indentation technique. Precise ultrasonic velocity measurements were carried out to evaluate the microstructures. A direct correlation has been observed between ultrasonic velocity and mechanical properties. This study demonstrates the feasibility of applying ultrasonic velocity measurements on-line for nondestructive evaluation of mechanical properties of alloy 625. 相似文献
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首钢Z向钢超声波探伤初步研究 总被引:3,自引:0,他引:3
介绍了首钢Z向钢超声波探伤的初步研究结果,通过理化检验、金相分析和原位分析等试验手段.得出中心部位的微裂纹和碳偏析是造成Z向钢超声波探伤不介格的主要原因。 相似文献
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Ufuk Dilek 《Canadian Metallurgical Quarterly》2005,19(1):42-48
This article discusses the use of nondestructive and laboratory testing techniques and load testing in evaluation of fire damage to precast prestressed concrete members in a parking structure. The in situ evaluation phase consisted of nondestructive testing of concrete using ultrasonic pulse velocity and radiographic exposures to locate tendons prior to the removal of cores. Flexural strength of concrete and dynamic Young’s modulus of elasticity and air permeability index of 25?mm (1?in.) thick disks sawed from the cores were determined in the subsequent laboratory testing phase. Analysis of concrete properties at small depth increments permitted assessment of whether a damage gradient was present and the nature of any gradient found, as expressed by changes in these properties. Based on the compromise in material properties indicated by nondestructive and laboratory testing, two affected double-tees were load tested. The deflection pattern observed during load testing confirmed the compromise indicated by the findings of the testing program. 相似文献
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针对因工业应用成本限制,中、小盾构隧道成型质量无损检测技术迁移至大直径盾构隧道时精度、速度折损严重的问题,以巡检车为载体,集成二维激光扫描仪、编码器和计算机等设备,研制了大盾构隧道成型质量巡检车,并提出一种基于数字图像的盾构质量非对称巡检方法. 分析大直径盾构的施工环境,滤除地面、车体点云,并采用邻域向量法提取中轴线,建立隧道中心坐标系. 偏心布置巡检路线,按照点云密度将采样点云分为稠密侧和稀疏侧点云,通过不同方法实现对管片接缝特征的拾取:将稠密侧点云绕中轴线展开为二维灰度图像,并通过缩放、归一化、梯度阈值分割等方法实现接缝图像分割;基于直线方程对接缝进行分类,结合管片结构、布置点位,推导出稀疏侧接缝与稠密侧接缝的线性分布公式,间接拾取稀疏侧接缝. 根据接缝特征点计算两侧管片边缘点云簇,计算管片错台量;剔除接缝点云簇,使用最小二乘法拟合隧道点云,计算隧道椭圆度. 最后在某大直径盾构隧道进行巡检试验,试验结果表明:成型质量巡检车在十四米盾构隧道中巡检速度为3 km·h−1,与传统方法的错台量检测偏差小于2 mm,椭圆度检测偏差小于0.1%,可以满足大直径盾构隧道成型质量巡检的高速度、高精度、低成本需求.
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