| 2021 №01 (01) |
DOI of Article 10.37434/tpwj2021.01.02 |
2021 №01 (03) |
The Paton Welding Journal, 2021, #1, 7-11 pages
Influence of irregular cyclic load on fatigue resistance of thin-sheet welded joints of heat-strengthened aluminium alloys
V.V. Knysh, I.M. Klochkov, S.I. Motrunich and A.G. Poklyatskyi
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
Abstract
The influence of irregular narrow band cyclic load on fatigue resistance of welded joints of heat-strengthened aluminium alloys with a thickness of 1.8–2.0 mm produced by argon arc welding using nonconsumable electrode (AAWNCE) and friction stir welding (FSW) was studied. The basic mechanical properties of the produced welded joints of aluminium D16, 1420 and 1460 alloys were determined. The fatigue curves of the investigated welded joints at narrow band cyclic block-program load with close to normal (Gaussian) and exponential distribution of stress amplitude value were plotted. It is shown that strength and fatigue resistance of welded joints of the investigated aluminium alloys produced by FSW exceed the corresponding values for the joints produced by AAWNCE in the whole range of service life of 105–2∙106 cycles of stress variation. 15 Ref., 3 Tables, 8 Figures.
Keywords: aluminium alloys, argon arc welding using nonconsumable electrode, friction stir welding, mechanical properties, fatigue resistance, irregular cyclic loads
Received 28.12.2020
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