Optimised Shear Horizontal Guided Wave Inspection Set-Up for Titanium Welds.

Christian Peyton, S. Dixon, B. Dutton, Wilson Vesga, R. Edwards
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Abstract

The inspection of welds in thin titanium sheets is vital to ensure that all components meet their required criteria. Shear horizontal (SH) guided waves may offer particular benefits for defect detection, especially the fundamental mode (SH0), which is non-dispersive. Electromagnetic acoustic transducers (EMATs) are efficient generators of SH waves. However, titanium is traditionally a difficult material to inspect using EMATs. Through finite element analysis and experiments, this work proposes an inspection set-up using a 6 mm wavelength SH0 mode as the incident wave. When the SH0 mode interacts with a defect, reflections occur. The primary reflection is the SH0 mode, but mode conversions occurring at the defect result in the reflection of a mode converted Lamb wave. The Lamb guided wave mode reflected in our work is the S0 mode. The weld inspection approach presented uses both of these guided wave modes. The intention of detecting multiple wave modes is to provide more information about the inspected region, improving the reliability of the results by providing an increased probability of detection and a reduced likelihood of false positives. The results show initial testing and validation of the proposed set-up, highlighting how the SH0 mode reflection is sensitive to the weld quality. The positioning of the transducers sensitive to the S0 mode is also presented, showing the defect size's effect on the angle of reflection.
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优化剪切水平导波检测装置的钛焊缝。
对薄钛板焊缝的检查对于确保所有部件符合要求的标准至关重要。剪切水平(SH)导波可以为缺陷检测提供特殊的好处,特别是基模(SH0),它是非色散的。电磁声换能器(EMATs)是一种高效的SH波发生器。然而,钛在传统上是一种难以使用emat检测的材料。通过有限元分析和实验,本工作提出了一种使用6 mm波长SH0模式作为入射波的检测装置。当SH0模式与缺陷交互时,就会发生反射。主反射是SH0模式,但是在缺陷处发生的模式转换导致了模式转换的兰姆波的反射。在我们的工作中反映的Lamb导波模式是S0模式。所提出的焊缝检测方法使用了这两种导波模式。检测多波模式的目的是提供更多关于被检测区域的信息,通过提供更高的检测概率和降低误报的可能性来提高结果的可靠性。结果显示了所提出的设置的初步测试和验证,突出了SH0模式反射对焊接质量的敏感程度。给出了对S0模式敏感的换能器的定位,显示了缺陷尺寸对反射角的影响。
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