The Paton Welding Journal, 2017, №04



2017 №04 (02)

DOI of Article 10.15407/tpwj2017.04.03

2017 №04 (04)

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The Paton Welding Journal, 2017, #4, 14-18 pages
 

Application of high-frequency peening to improve the performance of butt welded joints in the atmosphere of temperate climate

V.V. Knysh, S.A. Solovej, V.I. Kyrian, L.I. Nyrkova and S.A. Osadchuk

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
The paper presents the results of investigations of the effectiveness of application of high-frequency mechanical peening (HFMP) to improve fatigue resistance characteristics of butt welded joints in metal structures operating in an atmosphere of temperate climate. Metallographic studies showed that HFMP treatment of fusion zone in butt welded joint of 15KhSND steel before exposure to high humidity conditions promoted an improvement of corrosion resistance of this zone: reduction of corrosion pit depth and of extent of HAZ damage from 100 % practically to 0. Fatigue testing of welded joints in the initial and HFMP strengthened states was performed before and after exposure to high humidity and temperature. It is found that HFMP strengthening of butt welded joints of 15KhSND steel before exposure allows increasing fatigue strength at 2•10⁶ cycles by 39 % and cyclic fatigue life up to 9 times. 16 Ref., 2 Tables, 5 Figures.
 
Keywords: butt welded joint, fatigue, high-frequency mechanical peening, high humidity
 
 
Received:                21.02.17
Published:               17.04.17
 
 
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