OBRABOTKAMETALLOV Vol. 26 No. 1 2024 19 TECHNOLOGY Investigation of changes in geometrical parameters of GMAW surfaced specimens under the infl uence of longitudinal magnetic fi eld on electric arc Vadim Kuts a, Alexey Oleshitsky b, Alexander Grechukhin c, *, Igor Grigorov d Southwest State University, 94, 50 let Oktyabrya str., Kursk, 305040, Russian Federation a https://orcid.org/0000-0002-3244-1359, kuc-vadim@yandex.ru; b https://orcid.org/0000-0002-1097-8323, oav46@yandex.ru; c https://orcid.org/0000-0003-2037-6905, agrechuhin@mail.ru; d https://orcid.org/0000-0001-6207-8194, grighorov.ighor@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 1 pp. 6–21 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.1-6-21 ART I CLE I NFO Article history: Received: 28 November 2023 Revised: 07 December 2023 Accepted: 28 December 2023 Available online: 15 March 2024 Keywords: Electric arc Additive technologies Surfacing Deviation Geometric parameters Magnetic fi eld Funding The work was carried out within the framework of the implementation of the development program of FGBOU VO “Southwestern State University” of the project “Priority 2030”. ABSTRACT Introduction. The paper presents the results of research of additive manufacturing process by electric arc with axial feeding of steel fi ller wire in protective gas environment (GMAW technology) with additional infl uence of external longitudinal magnetic fi eld on electric arc. Purpose of work: an experimental study of the eff ect of a longitudinal magnetic fi eld during additive manufacturing by an electric arc with axial feed of fi ller wire made of structural steels in a shielding gas environment on the change in the geometrical characteristics of the layers being surfaced. Research Methods. The manufacturing of specimens was carried out on a 5-axis additive machine based on a CNC machine. Surfacing was carried out in the following modes: voltage 17.5 V; current 55–65 A; wire diameter 1.2 mm; wire material Sv-08G2S; wire feed rate 2,267 mm/min; approximate roll diameter 3.0 mm; roll length 50 mm; number of wires per one roll 312.5 mm; number of layers when surfacing the wall 5; magnet operation mode: alternating current with frequency 50 Hz, voltage 30 V; measured magnetic induction 5.7 mTl; initial height of the magnet above the substrate 10 mm; electrode stickout 10 mm; shielding gas: welding mixture CO2-Ar; gas pressure (fl ow rate) 0.15 MPa. Results and discussion. The conducted experimental study showed that the eff ect of longitudinal magnetic fi eld had a statistically signifi cant eff ect on the change in the dimensions of the singular, namely an increase in the width of the layers being surfaced by 34.1 %, with a calculated signifi cance index close to zero, and a decrease in height by 20.2 %, with a calculated signifi cance index equal to 2.7×10−5. The eff ect of longitudinal magnetic fi eld had a statistically signifi cant eff ect on the change of the overall dimensions of the specimens consisting of fi ve layers, namely, the width of the specimens increased by 11.2 % with a calculated signifi cance index of 4.3×10−3, and the height of the specimens decreased by 10.3 % with a calculated signifi cance index of 6.3×10−5. The eff ect of longitudinal magnetic fi eld had no statistically signifi cant eff ect on the change of the vertical deviation from straightness for the side walls of the specimens, with a calculated signifi cance index of 0.3277, and had no statistically signifi cant eff ect on the change of the error of the width of the walls of the specimens, with a signifi cance index of 0.098. For citation: Kuts V.V., Oleshitsky A.V., Grechukhin A.N., Grigorov I.Y. Investigation of changes in geometrical parameters of GMAW surfaced specimens under the infl uence of longitudinal magnetic fi eld on electric arc. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 1, pp. 6–21. DOI: 10.17212/1994-6309-2024-26.1-6-21. (In Russian). ______ * Corresponding author Grechukhin Alexander N., Ph.D. (Engineering), Associate Professor Southwest State University, 94, 50 let Oktyabrya str., 305040, Kursk, Russian Federation Tel.: +7 (47122) 2-26-69, e-mail: agrechuhin@mail.ru References 1. Kurakin A.I., Strukov I.G., Skoblikov Ya.P., Karpov V.M., Efi mov E.I. Prognozirovanie geometrii sloya pri dugovom additivnom proizvodstve P-GMAW iz alyuminievykh splavov [Prediction of bead layer geometry in P-GMAW wire arc additive manufacturing of aluminium alloys]. Morskie intellektual’nye tekhnologii = Marine Intellectual Technologies, 2023, no. 2-1 (60), pp. 245–252. DOI: 10.37220/MIT.2023.60.2.030. 2. Oskolkov A.A., Matveev E.V., Bezukladnikov I.I., Trushnikov D.N., Krotova E.L. Peredovye tekhnologii additivnogo proizvodstva metallicheskikh izdelii [Advanced technologies for additive manufacturing of metal product]. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Mashinostroenie,
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