Automatic Welding, 2019, №11



2019 №11 (07)

DOI of Article 10.15407/as2019.11.08

2019 №11 (09)

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Avtomatichne Zvaryuvannya (Automatic Welding), #11, 2019, pp.52-58

Procedure of accelerated corrosion testing for modelling the long-term effect of moderate climate atmosphere on welded joints

V.V. Knysh, S.O. Osadchuk, S.O. Solovej, L.I. Nyrkova, A.O. Rybakov

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03680, Kyiv. E-mail: office@paton.kiev.ua

We propose a procedure of accelerated corrosion testing of welded joints for modeling the long-term effect of the most significant climatic factors of moderate climate atmosphere (temperature and relative humidity) on them. Duration of accelerated testing of welded joints in the humidity chamber to obtain corrosion damage, which is characteristic for welded joints of metal structures after approximately 12 years of operation, is substantiated. Fatigue testing of butt and tee welded joints of 15KhSND steel after preliminary exposure to 2 mln. cycles at maximum stresses of 150 MPa, corrosion testing under the conditions of higher temperature and relative humidity without strengthening and with further strengthening by the technology of high-frequency mechanical peening, were  performed. It is found that strengthening by the technology of high-frequency mechanical peening improves 10 times the cyclic fatigue life of butt and tee welded joints with accumulated fatigue and corrosion damage. 23 Ref., 5 Fig.
Keywords: welded joint, corrosive environment, fatigue, accelerated corrosion testing, high-frequency mechanical peening, improvement of cyclic fatigue life

Received: 27.09.2019
Published: 20.11.2019

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