The Paton Welding Journal, 2016, №03



2016 №03 (01)

DOI of Article 10.15407/tpwj2016.03.02

2016 №03 (03)

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The Paton Welding Journal, 2016, #3, 12-17 pages
 

Improvement of cyclic fatigue life of tee welded joints by high-frequency mechanical peening under the conditions of higher humidity and temperature

V.V. Knysh, S.A. Solovej, L.I. Nyrkova, L.G. Shitova And A.A. Rybakov

E.O. Paton Electric Welding Institute, NASU. 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
The study provides experimental evidence of effectiveness of application of high-frequency mechanical peening (HFMP) to improve the fatigue resistance characteristics of tee welded joints in metal structures, which operate under moderate climatic conditions. Corrosion damage characteristic for such structures after long-term service was achieved by soaking the welded joint in G4 humidity chamber at increased humidity and temperature for 1200 h. Metallographic studies were performed of the weld zone and HAZ in as-welded (unstrengthened) and HFMP-strengthened states before and after corrosive medium impact. It is established that as a result of HFMP strengthening, the joint resistance to the impact of higher humidity and temperature becomes higher. Fatigue tests of welded joints in the initial and strengthened states before and after soaking in the humidity chamber were performed. It is found that strengthening by HFMP technology before the corrosive impact allows increasing the limited endurance limit, based on 2•10⁶ cycles, of tee welded joints by 48 % and increasing the cyclic fatigue life 6–8 times. 12 Ref., 1 Table, 7 Figures.
 
Keywords: tee welded joint, corrosive medium, fatigue, high-frequency mechanical peening, ultrasonic impact treatment, improvement of corrosion fatigue resistance
 
 
Received:                02.02.16
Published:               28.04.16
 
 
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