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Advantages and Limitations of TOFD Technique in Casting Inspection

机译:TOFD技术在铸件检验中的优势和局限性

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In service inspection (ISI) of aged power plant parts has a delicate task toprovide information on presence, position, orientation and size of defectsin material. As far as results of ISI are just a starting point forelaborate procedure of life assessment or risk analyses, the accuracy andreliability of these results are particularly important.Time of Flight Diffraction (TOFD) technique is regarded as one of ultrasonictechniques capable to fulfil required precision, being approved in nowadaysroutine inspection of retaining rings or LP turbine rotor discs. Apart fromthese, usually highly automated inspections, a manual TOFD testing designedfor particular plant component reveals reliable and useful defectinformation as well.In this work, results of TOFD inspection of turbine inlet casing arepresented. The component was inspected subsequently during several years upto the point of substitution by a new one. Gained TOFD results are comparedwith results of visual and metallographic examination of samples cut outfrom the casing.
机译:老化的电厂零件的在役检查(ISI)的任务很艰巨, 提供有关缺陷的存在,位置,方向和大小的信息 在材料上。就ISI的结果而言,这仅仅是起点 详尽的生活评估或风险分析程序,准确性和 这些结果的可靠性尤为重要。 飞行时间衍射(TOFD)技术被认为是超声波技术之一 能够满足所需精度的技术,如今已得到认可 固定环或LP涡轮转子盘的常规检查。除了 这些通常是高度自动化的检查,是通过手动TOFD测试设计的 对于特定的植物成分,显示出可靠且有用的缺陷 信息。 在这项工作中,TOFD检查涡轮机进口壳体的结果是 提出了。随后几年中对该组件进行了检查 直到被新的替代。比较获得的TOFD结果 目测和金相检查的结果,切出的样品 从外壳。

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