TOFD Technique Applied to Weld Inspection of Special Strartures
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摘要: 叙述了TOFD 技术的工作原理。在蜗壳焊缝试板及焊缝检测中将超声波和射线检测技术进行了对比。焊缝的缺陷解剖试验表明, TOFD技术能检出常规超声和射线检测方法难以检出的平面状缺陷, 对气孔、夹杂等体积状缺陷的检测结果与实际解剖结果有出入。鉴于TOFD技术缺陷检出率高, 对面状缺陷灵敏、不受方向性限制、检测速度快、扫描图显示直观并且无辐射等优点, 因此在石化装置等在役特种设备的安全评定中具有很好的推广价值。Abstract: The working principle of TOFD technique was described. The testing effects were compared between radiographic testing and ultrasonic testing method for the detection of volute plate and seam weld. The actual weld section showed that the planar defects, which were difficult to detect by conventional ultrasonic testing and radiographic testing method, were easy to TOFD technique, but there was some error for the porosity, inclusions and such as volume-like defects between TOFD testing and actual section. Due to its high defect detection rate, sensitive to planar defects, less limits by direction, fast testing speed, intuitive scanning image and with no radiation and so on, TOFD technique had good prospect on the safety evaluation at petrochemical installations and so on special equipments.
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Keywords:
- Time of diffraction testing technique /
- Volute weld /
- Contrast test /
- Detection rate
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[1] ASME Ⅷ 锅炉压力容器规范第八卷[S]. [2] ASME CODE CASE-2235 锅炉压力容器规范案例[S]. [3] ASTM-2373-04 超声衍射波时差技术(TOFD)标准[S]. [4] BS 7706—1993 用于缺陷检测、定位和定量的超声衍射波时差方法的校正和设置[S]. [5] ENV 583-6 2000 超声衍射波时差法用于缺陷检测和尺寸测定[S]. [6] NEN 1822－2005 超声衍射波时差法检测技术验收规范[S]. [7] CEN/TS 14751 超声衍射波时差法(TOFD)检测焊缝[S].
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