共查询到20条相似文献,搜索用时 156 毫秒
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介绍了微机辅助射线照相探伤工艺编制系统的原理,方法,功能,特点,使用说明和程序框图。该系统利用TrueBASIC语言编制,包括射线照相工艺编制,射线防护和射线探作资料查询三大部分,符合国标GB3323-87,一般探伤人员均可在生产实际中用应用。 相似文献
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1 前言 无损检测技术作为一种科学的无损检测方法,在锅炉压力容器的焊缝检测中,有极为广泛的应用。射线胶片照相检测是无损检测五大常规检测方法之一,X射线胶片照相方法具有检测结果直观、准确、底片存档可查等优点,但也不可避免地存在检测周期长、检测成本高等不足。尤其是锅炉蛇形管的检测,《安规》要求,76mm以下的管子对接焊缝的探伤比例至少50%,我公司每台锅炉的蛇形管的焊接接头非常多,一般在1000个左右,这样,探伤任务非常艰巨,管接头焊缝的射线探伤处于低效率、高消耗的状态中。另外,由于蛇形管的形状特殊性,在工艺上很难对焊缝做两次相互垂直的曝光,焊缝一次成像 相似文献
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《X射线工业探伤硒板静电照相设备及方法的研究》于5月27日在北京通过技术鉴定。鉴定会由国家劳动人事部劳动保护局主持召开。传统的胶片(银盐)X射线工业探伤是一种重要的无损检测方法,广泛应用于机械、造船、航空、锅炉和压力容器制造等行业中。胶片照相以卤化银胶片作为感光材料,感光后产生化学反应而成象,再经显影、定影等过程, 相似文献
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射线探伤机运用微机控制,能自动调整管电压,使胶片曝光正确,确保X光底片黑度和灵敏度,提高射线照相的质量。1 应用原理在射线探伤中,胶片曝光是否正确,常要通过实验,根据材料、厚度、曝光条件绘制一张曝光曲线表进行控制,但在实际探伤中还需修正。而采用 相似文献
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李登发 《机械工人(热加工)》2008,(20):44-45
在石油、化工和乙烯等装置的施工中,常遇到配套的开工加热炉的施工。对炉管焊口,设计图样的要求进行100%射线探伤,一般采用X射线探伤,按《钢熔化焊对接接头射线照相和质量分级》GB3323-1987标准评定,Ⅱ级合格。在施工中炉管预制焊口能达到全方位拍片,满足设计图样要求。但安装焊口因炉管本身的结构原因,无法进行100%X射线探伤,达不到设计图样要求。对这一部分焊口, 相似文献
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1994年4月11日至19日在四川省重庆市举办了射线、磁粉、渗透探伤高级更新考核班。全国考委会秘书处在更新考核班上安排了以下六个讲座: 1.国内外无损检测发展动态(合肥通用机械研究所 潘荣宝) 2.近年来国内新增无损检测标准介绍(劳动部检测中心 康纪黔) 3.近几年来国内外射线探伤标准介绍(锦西化工机械厂 徐彦) 4.国内外表面探伤标准、工艺编制讲解(四川省 相似文献
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在射线检测原理与方法的基础上,开发了一套基于计算机和信息技术的射线照相检测及质量评定虚拟仿真实验系统,可还原射线照相检测及质量评定的真实情境,直观反映射线照检测设备、工艺、人员和各环节的状态和参与过程,可以激发学生的学习兴趣与爱好,提高学生发现问题、分析问题和解决问题的能力. 相似文献
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论述了管子 -管板焊缝射线照相技术应用的重要性和必要性 ,提出了管子 -管板焊缝的射线照相技术适用的焊接结构和焊接的技术要求 ,给出了管子 -管板焊缝射线照相技术的工艺要点 相似文献
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L. FAN‡ D. PATERSON† I. McNULTY‡ M. M. J. TREACY & J. M. GIBSON‡ 《Journal of microscopy》2007,225(1):41-48
Measuring medium‐range order is a challenging and important problem in the structural study of disordered materials. We have developed a new technique, fluctuation x‐ray microscopy, that offers quantitative insight into medium‐range correlations in disordered materials at nanometre and larger length scales.In this technique, which requires a spatially coherent x‐ray beam, a series of speckle patterns are measured at a large number of locations in a sample using various illumination sizes. Examination of the speckle variance as a function of the illumination spot size allows the structural correlation length to be measured. To demonstrate this technique we have studied polystyrene latex spheres, which serve as a model for a dense random‐packed glass, and for the first time have measured the correlation length in a disordered system by fluctuation X‐ray microscopy. We discuss data analysis and procedures to correct for shot noise and detector noise. This approach could be used to explore medium‐range order and subtle spatial structural changes in a wide range of disordered materials, from soft matter to nanowire arrays, semiconductor quantum dot arrays and magnetic materials. 相似文献
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Lucille A. Giannuzzi 《Scanning》2005,27(4):165-169
In addition to the production of secondary electrons and secondary ions, characteristic x‐ray emission may also result from ion/solid interactions and is the basis for the well‐known analysis technique referred to as particle‐induced x‐ray emission. Characteristic x‐rays may be emitted by either bombardment by MeV protons or heavy ions of a few keV. The advantage to heavy ions is that the x‐ray yield is confined to the region near the surface defined by the collision cascade. An advantage of heavy ion‐induced x‐ray emission over electron‐induced x‐ray emission is that the Bremsstrahlung is potentially orders of magnitude lower. Thus, ion‐induced x‐ray spectra may provide for superior peak‐to‐noise ratios, and there‐fore, offers trace element sensitivity compared with elec‐tron‐induced x‐ray emission. In addition, the near surface ion/solid interactions also allow for the possibility of surface analysis or depth profiling. A Dual Beam instrument was used to collect focused ion beam‐induced x‐ray (FIBIX) spectra. The acquisition of characteristic x‐rays from targets via FIBIX is demonstrated and compared with scanning electron microscopy‐induced x‐ray energy dispersive spectroscopy spectra and is consistent with the theory described above. 相似文献
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曹端德 《仪表技术与传感器》1997,(7):21-24
本文介绍的传感器实验系统是一种CAI(计算机辅助教学)教学系统。通过对不同种类传感器性能的测试分析,可以使学习者主动地掌握检测技术及智能仪器设计方面的知识和技能 相似文献
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微波无损检测技术及应用 总被引:2,自引:0,他引:2
微波无损检测技术宾些年来发展迅速,应用范围越来越广,但在火力发电厂的应用为数不多。文中介绍了微波无损检测的原理、特点、方法。通过与超声波无损检测技术,核辐射无损检测技术的比,指出了微波无损检测技术的独到之处。介绍了微波无损检测技术的应用场合,并对其在火电厂中的应用情况举例加以说明。最后阐述了微波无损检测技术的现状及发展趋势。 相似文献
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E. LIMA A. DIAZ M. GUIZAR‐SICAIROS S. GORELICK P. PERNOT T. SCHLEIER A. MENZEL 《Journal of microscopy》2013,249(1):1-7
We developed cryo‐scanning x‐ray diffraction microscopy, utilizing hard x‐ray ptychography at cryogenic temperature, for the noninvasive, high‐resolution imaging of wet, extended biological samples and report its first frozen‐hydrated imaging. Utilizing phase contrast at hard x‐rays, cryo‐scanning x‐ray diffraction microscopy provides the penetration power suitable for thick samples while retaining sensitivity to minute density changes within unstained samples. It is dose‐efficient and further minimizes radiation damage by keeping the wet samples at cryogenic temperature. We demonstrate these capabilities in two dimensions by imaging unstained frozen‐hydrated budding yeast cells, achieving a spatial resolution of 85 nm with a phase sensitivity of 0.0053 radians. The current work presents the feasibility of cryo‐scanning x‐ray diffraction microscopy for quantitative, high‐resolution imaging of unmodified biological samples extending to tens of micrometres. 相似文献
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X射线衍射仪升级改造的最简方案 总被引:1,自引:1,他引:0
介绍一种十分简单的旧号X射线衍射仪微仪微机化的升级改造技术以及相应的数据采集与分析系统(XRDS)。该系统将采集的衍射数据以文件形式存盘,并对该数据文伯进行分析处理。处理结果可用图谱的形式显示、打印,亦可生成峰数据表或扫描数据表文伯。系统的结构简单、能充分利用仪器的机械精度,原仪器记录系统仍可独立工作。改造工作只需连接几对信号线便可完成,价格低谦,适用于任何旧型号的X射线衍射仪。 相似文献