PSI - Issue 16

Leonid Lobanov et al. / Procedia Structural Integrity 16 (2019) 27–34 Leonid Lobanov, Nikolai Pashсhin / Structural Integrity Procedia 00 (2019) 000 – 000

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welding stresses in repair welds from tensile to compression ones, the value of which reaches -40 MPa, that is more effective than heat treatment and significantly less expensive.

3. Conclusions

EDT has a positive effect on increasing the fatigue life of AMg6 alloy welded joints; this is determined by a decrease in the level of residual welding stresses. Experience of practical application of EDT showed that the single-channel ED, due to their simplicity and longer cycle of charge (as compared with two-channel ones), is rational to use for straightening of thin-sheet welded structures. At the same time the two-channel ED, due to peculiarities of pulse current input into the material treated, is more preferable for reducing the level of residual welding stresses. Moreover, a short time of charge, typical for two-channel ED, allows applying the given type of EDT together with a welding cycle, which is challenging for the realization of deformation-free welding of critical structures. Baranov, Yu.V., Troitsky, O.A., Avramov, Yu.S., 2001. Physical fundamentals of electropulse and electroplastic treatment and new materials. MGIU, Moskow, pp. 844. Darovsky, Yu.F., Markashova, L.I., Abramov, N.P., 1985. Method of specimen preparation for electron microscopic studies. Avtomaticheskaya Svarka 12, 60 – 65. Kishkina, S.M., Bratashev, V.L., Guk, N.V., 1988. Fracture of aluminium alloys. Atlas of fractograms. VIAM, Moskow, pp. 168. Lobanov, G.I., Pivtorak, V.A., Savitsky, V.V., Tkachuk, G.I., 2006. Method of determination of residual stresses in welded joints and elements of structures using electron speckle-interferometr. Avtomaticheskaya Svarka 1, 10 – 13. Lobanov, L.M., Kondratenko, I.P., Zhiltsov, A.V., Karlov, O.M., Pashchyn, M.O., Vasyuk, V.V., Yashchuk, V.A., 2016a. Electrophysical unsteady processes in the system to reduce residual stresses in welds. Tekhnicheskaya elektrodinamika 6, 10 – 19 (in Ukrainian). Lobanov, L.M., Pashchin, N.A., Mikhodui, O.L., and Khokhlova, J.A., 2016b. Investigation of residual stresses in welded joints of heat-resistant magnesium alloy ML10 after electrodynamic treatment. Journal of Magnesium and Alloys, 4 (2), 77 – 82. Masubuchi, K., 1980. Analysis of Welded Structures. Pergamon Press, Oxford pp. 642. Yakovleva, T.Yu., 2003. Local plastic deformation and fatigue of metals. Naukova Dumka, Kyiv, pp. 236. References