|2020 №04 (02)||
DOI of Article
|2020 №04 (04)|
Avtomaticheskaya Svarka (Automatic Welding), #4, 2020, pp.22-28
Influence of high-frequency peening and atmosphere of marine climate on the cyclic life of T-welded joints with surface fatigue cracks
V.V. Кnysh, S.O. Solovei, L.I. Nyrkova, V.G. Kot, A.O. Grishanov
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: offi firstname.lastname@example.org
The given results of investigations of the effi ciency of the application of high-frequency mechanical peening technology to increase the residual life of welded joints of 15KhSND steel with surface fatigue cracks of 2…20 mm length and corrosion damages typical for structures after a long-term operation in the conditions of marine climate are presented. The long-term infl uence of the atmosphere of maritime climate, which is typical for coastal regions of Ukraine, on the state of the surface of the joints was modelled by the exposure of samples in the salt fog chamber KST-1 during 1200 h. It was shown that surface cracks and corrosion damages signifi cantly reduce the residual cyclic life of welded joints. It was experimentaly found that reinforcement of HMP of T-welded joints with surface fatigue cracks of 5…7 mm length (depth is up to 1.6 mm) and characteristic corrosion damages increases their residual cyclic life to the level of welded joints with corrosion damages, strengthened by high-frequency mechanical peening at the stage of manufacturing. It is shown that at 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 peening technology for such joints does not increase the cyclic life and is ineffi cient. 14 Ref., 2 Tabl., 5 Fig.
Keywords: T-welded joint, corrosive medium, fatigue, accelerated corrosion tests, salt fog, high-frequency mechanical peening, increase in cyclic life.
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