The scan surface blind area comparison test block of ultrasonic time of flight diffraction method
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摘要: 由于超声波衍射时差法（TOFD）的扫查面盲区较大，所以在应用TOFD技术前需要准确掌握盲区的大小，才能保证受检产品得到有效检测，避免漏检。检测前除了对扫查面盲区进行计算外，还必须采用相应的对比试块进行验证。结合目前检测技术的需求，设计了一种新型的扫查面盲区对比试块，采用该试块能够得到不同工况、不同检测条件下的扫查面盲区大小，从而避免漏检。Abstract: Due to the large blind area of the scanning surface of the ultrasonic time of flight diffraction method (TOFD), it is necessary to accurately grasp the size of the blind area before applying TOFD technology to ensure that the inspected product is effectively tested and avoid missed inspections. In addition to calculating the blind area of the scanning surface before testing, the corresponding comparison test block must also be used for verification. Combining the requirements of current detection technology, a new type of scanning surface blind zone comparison test block is designed. Using this test block, the scanning surface blind zone under different working conditions and different detection conditions can be obtained, which can avoid the deviation of the scanning surface blind zone verification. Thereby avoiding missed inspection.
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Keywords:
- TOFD /
- scan surface blind area /
- comparison test block /
- missing inspection
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[1] 张东辉, 孙旭,金士杰.TOFD检测近表面盲区抑制方法研究[J].无损探伤,2019,43(4):6-9. [2] 强天鹏, 肖雄,李智军.TOFD技术检测盲区的计算和特性分析[J].无损检测,2008,30(10):738-740. [3] 范雪峰, 马守和,刘常庆.一种制作φ1.6 mm竖通孔对比试块的新方法[J].无损探伤,2012,36(5):44-45.
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