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Friction stir welded lap joint inspection using ultrasonic guided waves


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Belanger, Pierre and Jahazi, Mohammad. 2019. « Friction stir welded lap joint inspection using ultrasonic guided waves ». In 45th Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 38 (Burlington, VT, USA, July 15-19, 2018) Coll. « AIP Conference Proceedings », vol. 2102. USA : AIP Publishing.

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Friction stir welding is a solid state joining process used across a range of industries from shipbuilding to aerospace. However, defects such as kissing bonds or wormholes usually associated with poor control of the rotational and traverse speeds during manufacturing remain difficult to detect using standard nondestructive testing methods. This paper investigates the correlation between the transmission of low-frequency ultrasonic guided waves through a lap joint and the rotational speed used during manufacturing. The aim of the method is therefore to nondestructively assess the manufacturing parameters rather than detect specific defects. The experimental setup comprises a 100 kHz shear transducer used for the excitation of S0, six pairs of 3.2 mm aluminium plates in a friction stir welded lap joint configuration and a 2D laser Doppler vibrometer. The lap joints were manufactured with a rotational speed varying from 600 RPM to 1050 RPM while the traverse speed and the plunge were maintained constant. The experimental results showed excellent correlation between the transmission S0 and the stir zone width. Clear outliers were also identified when looking at the amplitude of the 2nd harmonic of the S0 mode.

Item Type: Conference proceeding
ISBN: 0094-243X
Bélanger, Pierre
Jahazi, Mohammad
Affiliation: Génie mécanique, Génie mécanique
Date Deposited: 11 Oct 2019 16:07
Last Modified: 13 Apr 2023 16:08

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