Technical Diagnostics and Non-Destructive Testing, 2024, №04



2024 №04 (05)

DOI of Article 10.37434/tdnk2024.04.06

2024 №04 (07)

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Technical Diagnostics and Non-Destructive Testing #4, 2024, pp. 38-42

Detection of internal microdefects in aluminum welded joints by the shearography method

L.M. Lobanov, O.P. Shutkevych, I.V. Kyyanets, I.L. Shkurat, K.V. Shyyan, V.V. Savitsky

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: viktor.savitsky@nas.gov.ua

In modern industry, ensuring the quality of welded joints, particularly those made from aluminum alloys, is a crucial task for enhancing the reliability of structures. Special attention is paid to detecting internal defects that may lead to premature failure. The aim of this work is to develop and apply a shearography non-destructive testing in conjunction with thermal loading to detect micro-sized defects in welded joints of aluminum alloys. Loading was provided by an automated system that allowed the surface of the tested samples to be heated by 3-7°C for 2-4 seconds. The studies showed that the advanced shearographic equipment can detect defects as small as 0.3 mm in diameter, with a depth of up to 1.8 mm, both in the weld zone and in the base metal. The proposed parameters of thermal loading and the settings of the interferometer optical scheme allowed achieving a high sensitivity to micro-defects. The shearography method with automated thermal loading is effective for detecting internal defects in welded joints of aluminum alloys and can be used for non-destructive testing in production conditions. 12 Ref., 9 Fig.
Keywords: non-destructive testing, shearography, aluminum alloys, microdefects

Received: 14.10.2024
Received in revised form:15.11.2024
Accepted: 20.12.2024

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