Avtomaticheskaya Svarka (Automatic Welding), #1, 2020, pp.39-44
Impact of high-frequency peening and moderate climate atmosphere on cyclic fatigue life of tee welded joints with surface fatigue cracks
V.V. Knysh, S.O. Solovej, L.I. Nyrkova, A.O. Grishanov, V.P. Kuzmenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.
The paper presents the results of investigations of the effectiveness of application of the technology of high-frequency mechanical peening to improve the residual fatigue life of tee welded joints of 15KhSND steel with surface fatigue cracks and corrosion damage characteristic for structures after long-term service under the conditions of moderate climate of the central regions of Ukraine. Corrosion damage on the surface of joints was obtained by exposure in G4 hydrostat at higher temperature and relative humidity of air for 1200 h. It is experimentally established that strengthening by the technology of high-frequency mechanical peening of tee welded joints with surface fatigue cracks of up to 10 mm length and characteristic fatigue damage increases their cyclic fatigue life by up to 10 times. It is shown that application of the technology of high-frequency mechanical peening of welded joints, which contain fatigue cracks of 20 mm and greater length, does not lead to improvement of cyclic fatigue life and is not effective. 10 Ref., Tabl. 2, Fig. 5.
Keywords: tee welded joint, corrosive environment, fatigue, accelerated corrosion testing, high-frequency mechanical peening, improvement of cyclic fatigue life
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