Abstract

Agglomerations of oxide films are some of the typical defects of friction stir welding. The structure of such defects and their small opening do not allow finding them using the conventional ultrasonic nondestructive testing methods (in particular, by the pulse-echo technique), among other things because of their low reflectivity. We have proposed a technique of artificial introduction of oxide films into a welded joint. We have shown that, to reveal such defects, it is promising to use the diffraction methods of ultrasonic nondestructive testing. The diffraction methods make it possible to detect signals from defects with minimum opening as well as from defects with a partially metallic bonding, which are semitransparent to ultrasonic waves and revealing of which is impossible using other methods of ultrasonic testing, in particular, the pulse-echo technique, along with X-ray testing.

中文翻译：

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用于揭示人工缺陷的超声波检测衍射方法的研究，模拟摩擦搅拌焊缝中的氧化膜破裂

摘要

氧化膜的结块是搅拌摩擦焊的一些典型缺陷。这种缺陷的结构和它们的小开口不允许使用传统的超声波无损检测方法（特别是通过脉冲回波技术）发现它们，尤其是因为它们的反射率低。我们提出了一种在焊接接头中人工引入氧化膜的技术。我们已经表明，为了揭示此类缺陷，使用超声波无损检测的衍射方法是有希望的。衍射方法可以检测来自具有最小开口的缺陷以及来自具有部分金属键的缺陷的信号，这些信号对超声波是半透明的，并且使用其他超声波检测方法是不可能的，特别是，