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2020 №04 (02) DOI of Article
10.37434/tpwj2020.04.03
2020 №04 (04)

The Paton Welding Journal 2020 #04
TPWJ, 2020, #4, 19-24 pages
 
Impact of high-frequency peening and marine atmosphere on the cyclic life of t-welded joints with surface fatigue cracks

Authors
V.V. Knysh, S.O. Solovei, L.I. Nyrkova, V.G. Kot and A.O. Grishanov
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The results of investigations of the efficiency of application of high-frequency mechanical peening technology to increase the residual life of T-welded joints of 15KhSND steel with surface fatigue cracks of 2–20 mm length and corrosion damage typical for structures after long-term service in the conditions of marine climate are presented. The long-term impact of marine atmosphere, which is typical for coastal regions of Ukraine, on the state of the surface of joints, was simulated by exposure of the samples in the salt spray chamber KST-1 for 1200 h. It was shown that surface cracks and corrosion damage significantly reduce the residual cycle life of welded joints. It was experimentally found that HFMP strengthening of T-welded joints with surface fatigue cracks of 5–7 mm length (depth is up to 1.6 mm) and characteristic corrosion damage increases their residual cyclic life to the level of welded joints with corrosion damage, strengthened by high-frequency mechanical peening at the stage of manufacturing. It is shown that in the presence of fatigue cracks of 20 mm length (about 6 mm depth), their residual life is reduced by up to 10 times, and the use of high-frequency mechanical peeening technology for such joints does not increase the cyclic life and is ineffective. 14 Ref., 2 Tables, 5 Figures.
Keywords: T-welded joints, corrosive medium, fatigue, accelerated corrosion tests, salt spray, high-frequency mechanical peening, increase in cyclic life

Received 19.02.2020

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