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2020 №04 (06) DOI of Article
10.37434/tpwj2020.04.01
2020 №04 (02)

The Paton Welding Journal 2020 #04
TPWJ, 2020, #4, 2-8 pages
 
Increase in the life of welded joints of AMg6 aluminum alloy

Authors
L.M. Lobanov, M.O. Pashchyn, O.M. Tymoshenko, P.V. Goncharov, O.L. Mikhodui and K.V. Shiyan
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 effect of electrodynamic action on the life of welded joints of AMg6 aluminum alloy under cyclic loading was investigated. It was found that electrodynamic treatment of specimens of butt welded joints of AMg6 alloy results in reducing the level of residual tensile welding stresses, which is followed by their transition to compression. It is shown that as a result of double-sided single-channel electrodynamic surface treatment in welded joints of AMg6 alloy, the cyclic life is three times increased as compared to the initial one. Additional electrodynamic treatment of the fusion line five times increases the life as compared to the non-treated metal. In the comparative evaluation of single- and two-channel electrodynamic treatment of specimens, it was found that the increase in life when using a two-channel scheme (as compared to single-channel) is determined by the controlled synchronization of components of electrodynamic effect, which eliminates the passage of electric current pulse through its treated metal in the phase of its attenuation. It was shown that at electric pulsed action, the life of two-channel treated specimens is more than 50 % higher than that of the dynamic ones, which is connected with the contribution of electroplastic effect to the reduction of residual welding stresses. 8 Ref., 4 Tables, 5 Figures.
Keywords: electrodynamic treatment, electrode device, single- and two-channel scheme, residual welding stresses, aluminum alloys, life, electric current pulse, cycle amplitude

Received 13.03.2020

References

1. Knysh, V.V. (2014) Determination of cyclic life of structure elements in arresting fatigue cracks. The Paton Welding J., 9-10, 69-71.
2. Knysh, V.V., Klochkov, I.N., Pashulya, M.P., Motrunich, S.I. Increase of fatigue resistance of sheet welded joints of aluminium alloys using high-frequency peening. Ibid., 5, 22-29.
3. Finkel, V.M., Ivanov, V.M., Golovin, Yu.I. (1983) Crack healing in metals by crossed electric and magnetic fields. Problemy Prochnosti, 4, 54-58 [in Russian]. https://doi.org/10.1007/BF01522429
4. Lobanov, L.M., Pashchin, N.A., Solomijchuk, T.G. et al. (2012) Changes of structure of AMg6 aluminium alloy in electrodynamic effects. Visnyk Ukrainskogo Material. Tovarystva, 5, 30-42 [in Russian].
5. Lobanov, L.M., Pivtorak, V.A., Savitsky, V.V., Tkachuk, G.I. (2006) Procedure for determination of residual stresses in welded joints and structural elements using electron speckleinterferometry. The Paton Welding J., 1, 10-13.
6. Lobanov, L.M., Pashchin, N.A., Yashchuk, V.A., Mikhodui, O.L. (2015) Effect of electrodynamic treatment on the fracture resistance of the AMg6 aluminum alloy under cyclic loading. Strength of Materials, 3, 91-98. https://doi.org/10.1007/s11223-015-9676-5
7. Yakovleva, T.Yu. (2003) Local plastic deformation and fatigue of metals. Kiev, Naukova Dumka [in Russian].
8. Baranov, Yu.V., Troitsky, O.A., Avramov, Yu.S. (2001) Physical principles of electropulsed and electroplastic treatments and new materials. Moscow, MGIU [in Russian].
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