2023 №03 (05) DOI of Article
2023 №03 (01)

Automatic Welding 2023 #03
Avtomaticheskaya Svarka (Automatic Welding), #3, 2023, pp. 39-45

Hygienic characteristics and regularities of generating magnetic fields in different methods of resistance welding

O.G. Levchenko1, Yu.O. Polukarov1, O.M. Goncharova2, O.M. Bezushko2

1National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute». 37 Peremohy Ave., 03056, Kyiv, Ukraine E-mail: levchenko.opcb@ukr.net
2E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The levels and spectral composition of the magnetic fields generated by the equipment for resistance welding in different methods was determined in order to evaluate their effect on the body of welders. Analysis of literary sources regarding resistance welding showed almost complete lack of information on electromagnetic safety of the mentioned welding methods. The proposed methodological approaches to determination of the levels of magnetic fields, means of measurements and methods of evaluating their effect on the welder’s body are given. On the basis of the analysis and processing of the obtained oscillograms and spectrograms of magnetic fields, the measurement of their frequency and quantitative characteristics was performed. To determine the overall level of the polyfrequency magnetic field generated during resistance welding, the proposed generalized indicator of the level of the magnetic field was used. It was established that in flash-butt and capacitor-discharge spot welding, the excess of the admissible level of magnetic field is predetermined by the shape of welding current and the presence of powerful harmonic signals in the frequency ranges of 50…1000 and 1000…10000 Hz in their range. It is shown that the spectral composition and the magnitude of the magnetic field signal are determined mainly by the welding method itself and the output parameters of the power sources. It is shown that it is possible to perform flash-butt and capacitor-discharge spot welding in a stationary method with placing the workplace (control panel) at a certain distance from the welding electrodes. Unlike these methods of joining metals, flash-butt welding is not dangerous to welders. However, in manual welding, the electrode cable should not wrap around the welder’s body. 14 Ref., 3 Tabl., 2 Fig.
Keywords: flash-butt welding, magnetic field, frequency, intensity, standard, indicators, recommendations

Received: 27.03.23


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