Ultrasonic testing (UT) techniques are highly capable of detecting defects in engineering components. The present manuscript intends to review the ultrasonic testing techniques applied to additive manufacturing products; either in-situ or offline. While the in-situ applications of ultrasonic testing to additive manufacturing are more favorable, literature holds a few research works on this topic. On the other hand, most of the works reported on ultrasonic testing of additive manufacturing products deal with offline applications. In many of these works, samples with artificial defects are prepared and tested through ultrasonic testing techniques including laser ultrasonics, phased arrays, guided waves and immersion ultrasonic testing. These UT methods and their applications in damage detection of additive manufacturing products are discussed in detail. Moreover, the codes and standards which are currently being developed for ultrasonic testing of additive manufacturing products are introduced. The choice of UT methods in detecting defects and material characterization in additive manufacturing is found to be highly dependent on the manufacturing process and capabilities of UT techniques.

中文翻译：

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增材制造中的超声波测试应用综述：缺陷评估、材料表征和过程控制

超声波检测 (UT) 技术具有很强的检测工程部件缺陷的能力。本手稿旨在回顾应用于增材制造产品的超声波检测技术；就地或离线。虽然超声波检测在增材制造中的原位应用更为有利，但文献中有一些关于这个主题的研究工作。另一方面，大多数关于增材制造产品超声波检测的工作都涉及离线应用。在其中许多工作中，通过超声检测技术（包括激光超声、相控阵、导波和浸入式超声检测）制备和检测具有人工缺陷的样品。详细讨论了这些 UT 方法及其在增材制造产品损伤检测中的应用。此外，还介绍了目前正在为增材制造产品的超声波检测制定的规范和标准。发现在增材制造中检测缺陷和材料特征的 UT 方法的选择高度依赖于 UT 技术的制造过程和能力。