Automatic Welding, 2023, №08



2023 №08 (01)

DOI of Article 10.37434/as2023.08.02

2023 №08 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #8, 2023, pp. 9-14

Modern technologies of electrophysical treatment for regulation of stress-strain states of elements of welded structures

L.M. Lobanov, M.O. Pashchyn, O.L. Mikhodui

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 development of industry stimulates the development of modern approaches to the optimization of welded structures. The use of pulsed electromagnetic fields, plasma currents, electrodynamic forces and their combined effects is a new trend in engineering practice. Treatment with a pulsed electromagnetic field (TPEMF) is a promising direction for optimizing the stress-strain states (SSS) of welded joints (WJ) made of non-ferromagnetic metal materials. Using the method of electron speckle interferometry, the effect of TPEMF on the SSS of samples of circumferential WJ with a thickness of δ = 1.0 mm from aluminium alloy AMg6 was investigated. The kinetics of the action of the force P of the magnetic field pressure on the residual displacements f and SSS of the samples during their TPEMF were investigated. TPEMF of WJ samples was performed without and with the use of an additional screen (δ = 5.0 mm) contributes to the reduction of f values by 2 and 4 times, respectively, and residual SSS by 50 and 80 %. The advantages of using electrodynamic treatment (EDT) of butt 3.0 mm alloy AMg61 (1561) in the TIG welding process are substantiated. It was proved that EDT during TIG contributes to the formation of peak values of residual compressive stresses in the weld zone by 60 % more than EDT during room temperature (Tk). The use of a pulsed barrier discharge (PBD), which generates a low-temperature plasma on the surface of the metal, contributes to the optimization of its structure. An increase in the hardness of HV structural steel 25KhGNMT as a result of its PBD treatment from 420 to 510 units was established. 8 Ref., 10 Fig.
Keywords: treatment of welded joints, pulsed magnetic field, pulsed barrier discharge; electrodynamic treatment, aluminium alloy, structural steel, residual displacements, stress-strain state, hardness of steel


Received: 21.06.2023

References

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2. Dubodelov, V.I., Goruk, M.S. et. al. (2018) The use of electromagnetic fields and magnetodynamic phenomena to intensify the effect on metal systems: world and Ukrainian experience. Materials Science. Achievements and Prospects, 2, 24-50.
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6. Zhang, Xinfang, Qin, Rongshan (2018) Exploring the Particle Reconfiguration in the Metallic Materials under the Pulsed Electric Current. Steel Research International Open Access, 89 (12), 1800062. https://doi.org/10.1002/srin.201800062
7. Kistler Instrumente AG. Quartz Accelerometer 8042. https:// www.datasheetarchive.com/kistler-datasheet.html
8. Lobanov, L.M., Pashchyn, M.O., Mikhodui, O.L. et. al. (2021) Modeling of stress-strain states of AMg6 alloy due to impact action of electrode-indenter in electrodynamic treatment. The Paton Welding J., 6, 2-11. https://doi.org/10.37434/tpwj2021.06.01

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