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2021 №01 (01) DOI of Article
10.37434/as2021.01.02
2021 №01 (03)

Automatic Welding 2021 #01
Avtomaticheskaya Svarka (Automatic Welding), #1, 2021, pp. 9-13

Influence of irregular cyclic load on fatigue resistance of thinsheet welded joints of heat-strengthened aluminium alloys

V.V. Knysh, І.М. Klochkov, S.I. Motrunich, A.G. Poklyatsky
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

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 non-consumable electrode (AAWNCE) and friction stir welding (FSW) was studied. The main 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 were plotted. It is shown that the 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 changes. 15 Ref., 3 Tabl., 8 Fig.
Keywords: aluminium alloys, argon arc welding using non-consumable electrode, friction stir welding, mechanical properties, fatigue resistance, irregular cyclic loads


Received: 28.12.2020

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