Abstract

We consider the procedure of ultrasonic quality control of weld seams in thin-walled titanium-alloy shells with a thickness of 0.6 mm. Publications devoted to the excitation and propagation of Lamb waves and practical problems of ultrasonic inspection of thin-walled products are reviewed. The problem of detecting adhesions (areas of a weld seam with lack of penetration that conduct ultrasonic waves well but do not provide mechanical strength) is solved. It is proposed to use a corner groove as an indicator of lack of penetration in the weld. The propagation of different modes of Lamb waves in the material is analyzed, and the optimal testing parameters are selected. High information content of the signal is achieved using wavelet analysis and fine-pitch precision digital filters. Defectograms of a weld containing defective and defect-free areas are analyzed. The results of ultrasound scanning are compared with metallography data.

中文翻译：

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使用不完全渗透指示器对薄壁钛壳中的焊缝进行超声波检测

摘要

我们考虑了厚度为 0.6 毫米的薄壁钛合金壳焊缝的超声波质量控制程序。回顾了致力于兰姆波的激发和传播以及薄壁产品超声检测的实际问题的出版物。解决了检测粘连（焊缝中缺乏穿透力，但可以很好地传导超声波但不提供机械强度）的问题。建议使用角槽作为焊缝未焊透的指标。分析不同模式的兰姆波在材料中的传播情况，选择最佳测试参数。信号的高信息含量是使用小波分析和细间距精密数字滤波器实现的。分析包含有缺陷和无缺陷区域的焊缝的缺陷图。将超声扫描结果与金相数据进行比较。