Remote ultrasonic imaging of a wire arc additive manufactured Ti-6AI-4V component using laser induced phased array

Lukacs, Peter and Davis, Geo and Stratoudaki, Theodosia and Williams, Stewart and MacLeod, Charles N. and Gachagan, Anthony; (2021) Remote ultrasonic imaging of a wire arc additive manufactured Ti-6AI-4V component using laser induced phased array. In: 2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, GBR, pp. 1-6. (https://doi.org/10.1109/I2MTC50364.2021.9459823)

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Abstract

Additive manufacturing (AM) has been revolutionizing the manufacturing industry due to its ability to significantly reduce waste and produce components with intricate shapes. Laser Ultrasonics (LU) is a non-contact and couplant free method to generate and detect ultrasound. LU can accommodate complex component shapes; thus, it has the potential to provide a reliable in-process inspection method for AM components. In recent years the development of Laser Induced Phased Arrays (LIPAs) helped overcome the inherently low signal amplitudes of LU at the non-destructive, thermoelastic regime. In this paper, the Full Matrix Capture data acquisition method is used and a LIPA of 68 elements is synthesized in post processing. The Total Focusing Method imaging algorithm is applied for ultrasonic imaging. The technique is demonstrated on a highly scattering titanium alloy Wire Arc Additive Manufactured (WAAM) component producing high quality ultrasonic images, accurately imaging defects at depths up to 10mm below the inspection surface.

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