共查询到17条相似文献,搜索用时 140 毫秒
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厚壁管焊接接头中间射线检验技术 总被引:1,自引:1,他引:0
在电站锅炉、汽机管道的安装检验和在用检验过程中,厚壁管是常见的检验对象。因考虑到该类管道的焊接难度和工作量,一旦发现超标缺陷返修 相似文献
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综述了我国超声衍射时差(TOFD)检测技术的发展历史、检测机构、检测标准、检测研究和应用情况等。目前,有21个锅炉压力容器制造单位及特种设备检验检测机构了开展TOFD检测技术的研究与应用工作。中国特种设备无损检测人员资格鉴定考核委员会已经对100多个检测人员进行了专门的TOFD技术培训与资格鉴定。有2个压力容器制造厂和3个检验检测机构已经制定了TOFD检测企业标准。我国的TOFD技术国家标准也在制定过程中。TOFD检测技术在我国已经实现了广泛的研究和应用。 相似文献
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炼化装置现场高压管道安装多具有壁厚超厚、高空口多、管径大、焊接时间长等特点,其安装工序大多在施工进度关键路径上,传统的射线检测方法受其壁厚制约,单口检测时间较长,往往影响施工进度。超声波衍射时差法(以下简称TOFD)技术以其较高的缺陷检出率、检测效率以及安全环保等优势,近年来,被多数炼化装置所采用。但由于设备调试准确性、工件表面打磨质量、耦合效果、管道曲率、表面盲区等都会对管道TOFD检测质量产生影响。故文中结合本单位在大连恒力石化公用管廊、 3套连续重整装置高压厚壁管TOFD检测实例,总结了炼化装置现场高压管道TOFD检测的难点及质量控制措施。 相似文献
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超声TOFD法在电站锅炉检测上的应用 总被引:3,自引:1,他引:2
介绍用超声TOFD(衍射时差)法检测在用电站锅炉低合金钢炉壁管中的腐蚀疲劳裂纹、主蒸汽管和再热蒸汽管等高温管道中的蠕变损伤裂纹以及节流阀热疲劳裂纹的国外最新动态。该法能快速、有效地对材料、焊缝和热影响区的表面开口裂纹和内部裂纹进行测深定高,从而对锅炉受压元件及本体进行剩余寿命诊断和安全评价。 相似文献
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S.K. Nath Krishnan Balasubramaniam C.V. Krishnamurthy B.H. Narayana 《NDT & E International》2010,43(2):152-162
Experimental probability of detection (POD) and probability of sizing (POS) curves are developed for the detection and sizing of surface-breaking cracks in components having complex geometry. A manual ultrasonic time of flight diffraction (TOFD) inspection system has been used to develop these POD and POS curves. Initially, it was assumed and subsequently verified that signal responses have a normal distribution. The effects of probe angle and probe center-to-center spacing on both POD and POS were observed. Unlike the PODs previously reported for conventional ultrasonic amplitude based flaw sizing techniques, the PODs associated with TOFD in the range of defect sizes considered here, exhibit a decreasing trend for a fixed set of experimental parameters. It is important to emphasize that the curves obtained in this work are specific to the geometry, specimen dimensions, set of notches and the specific probes used in the experiment. However, when using a manual TOFD inspection system, these curves can be useful for planning the risk-based inspection of components having complex geometry (such as a steam turbine rotor shaft). 相似文献
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