Technical Diagnostics and Non-Destructive Testing, 2024, №03



2024 №03 (03)

2024 №03 (05)

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Technical Diagnostics and Non-Destructive Testing #3, 2024, pp. 24-31

Causes of damage to a pipeline of AISI 316L steel

S.O. Osadchuk, L.I. Nyrkova, L.V. Goncharenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: lnyrkova@gmail.com

A damaged pipeline of stainless AISI 316L steel for cold water transportation, at a food industry enterprise after construction and stoppage for one year was investigated. A visual inspection of the specimens of welded joints of four pipes established that the pipes, mounted in a horizontal position, have the following welding defects in the lower part: weld irregularities, overlaps and metal leakage. It was shown that the welded pipe joints are durable against intergranular corrosion, and the base metal is resistant to pitting corrosion. The damage to the examined specimen of the welded pipe joint, which was confirmed by metallographic examinations, was caused by non-fusion of the weld with the base metal and partial penetration at the weld root, which led to through damages due to contact with residual water after hydraulic tests as a result of crevice corrosion. 17 Ref., 2 Tabl., 7 Fig.
Keywords: stainless steel, welded joint, potentiometry, optical microscopy, pitting corrosion, crevice corrosion

Received: 26.02.2024
Received in revised form: 29.04.2024
Accepted: 04.06.2024

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