2022 №04 (07) DOI of Article
2022 №04 (02)

Automatic Welding 2022 #04
цAvtomaticheskaya Svarka (Automatic Welding), #4, 2022, pp. 3-7

Electrodynamic treatment of welded joints of aluminium AMg6 alloy in the process of heating the weld metal

L.M. Lobanov1, M.O. Pashchyn1, O.L. Mikhoduj1, P.V. Goncharov1, A.V. Zavdoveev1, P.R. Ustymenko2

1E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2NTUU «Kyiv Polytechnic Institute named after Igor Sikorsky». 03056, Kyiv, Peremohy Ave., 37

The effect of thermal action in the process of electrodynamic treatment (EDT) of welded joints of AMg6 alloy on their stressstrained states was investigated. Based on the of the Prandtl-Reuss ratio for the movement of elastic-plastic environment at elevated temperatures, a mathematical model of evaluation of stress state of metal materials was developed as a result of their interaction with the electrode-identer at EDT. On the basis of the developed model, a calculated evaluation of the effect of elevated temperatures on residual stresses of a preliminary strained plate of AMg6 alloy as a result of EDT was carried out. The verification of the results of the calculation with the use of welded plates of AMg6 alloy of 2 mm thickness was carried out. Thermal action was carried out with the help of the accompanying EDT preheating of the weld metal. To evaluate the effect of the thermal potential of EDT on residual stresses, TIG welding of butt-joint specimens was performed. EDT of specimens at the temperature TEDT = 20 and 100 °C was performed. Applying the method of electron speckle-interferometry, the values of the longitudinal component (along the longitudinal axis of the weld) of residual welding stresses in the central cross-section of the specimens before and after EDT were measured. Thermal impact on EDT was provided with the use of a heat gun, and the heating temperature was controlled by an infrared thermometer. It was revealed that heating of the weld in the process of its EDT along the longitudinal axis of a butt joint provides greater values of residual compression stresses in the centre of the weld as compared to the treatment at T = 20 °C. 9 Ref., 2 Tabl., 5 Fig.
Keywords: electrodynamic treatment, welded joints, accompanying heating, residual welding stresses, aluminium alloys

Received: 22.02.2022


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