TPWJ, 2020, #1, 37-42 pages
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #1, 2020 (February)
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. Solovei, L.L. Nyrkova, A.O. Gryshanov and V.P. Kuzmenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
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 damages characteristic for structures after long-term service under the conditions of moderate climate of the central regions of Ukraine. Corrosion damages on the surface of joints were obtained by exposure in G4 hydrostat at higher temperature and relative humidity of air for 1200 h. It was experimentally established that strengthening of tee welded joints with surface fatigue cracks of up to 10 mm length and characteristic fatigue damages by the technology of high-frequency mechanical peening 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., 2 Tables, 5 Figures.
Keywords: tee welded joint, corrosive environment, fatigue, accelerated corrosion testing, high-frequency mechanical peening, improvement of cyclic fatigue life
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