OBRABOTKAMETALLOV Vol. 25 No. 4 2023 72 TECHNOLOGY The infl uence of automatic arc welding modes on the geometric parameters of the seam of butt joints made of low-carbon steel, made using experimental fl ux Egor Startsev a, *, Pavel Bakhmatov b Komsomolsk-na-Amure State University, 27 Lenin Avenue, Komsomolsk-on-Amur, 681013, Russian Federation a https://orcid.org/0000-0002-5811-7071, egorstarts@inbox.ru; b https://orcid.org/0000-0002-4271-0428, mim@knastu.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. 2023 vol. 25 no. 4 pp. 61–73 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.4-61-73 ART I CLE I NFO Article history: Received: 15 September 2023 Revised: 20 September 2023 Accepted: 27 September 2023 Available online: 15 December 2023 Keywords: Submerged welding Welding modes Geometric parameters of the seam The quality of the welded joint Funding The study was carried out with fi nancial support from the funds of the Federal State Educational Institution of Higher Education “KNAU” under the research project No. VN001/2020 “Development of an algorithm and study of the process of programmable control of the formation of a welding/ surfacing roller (including the use of additive technologies) on an automatic welding installation” (2020-2023). Acknowledgements Research was partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. The metallurgical industry in the territory of the Russian Federation has accumulated a signifi cant amount of slags obtained during the smelting of steels and cast iron. The presence of slag dumps adversely aff ects the ecology of regions with metallurgical enterprises. When reducing iron from slags, the by-product becomes an oxide agglomerate, which can be considered as a fl ux composition for arc welding/ surfacing under a layer of fl ux, fi llers of powder wires, coatings of welding stick electrodes. The purpose of the work is to establish the possibility of arc welding using the fl ux obtained by the authors and to determine the optimal welding modes with the condition of achieving the geometric parameters of the seam according to GOST 8713-79 and the quality of the welded joint (absence of internal defects). In this paper, butt welded joints of sheet steel VSt3sp with a thickness of 5 mm obtained by automatic welding under a layer of fl ux at direct current with forced formation of a root roller on ceramic linings using fl ux from recycled metallurgical slag of an electric steelmaking enterprise are investigated. Automatic welding of fl at specimens was carried out on a tractor-type ADF-1250 machine with a wire with a diameter of 3 mm, at a constant welding speed of 54 cm/ min with varying current and arc voltage within 400–600A and 27–37 V. The methods of investigation: Visual measuring and radiographic control, determination of deformation of specimens by laser scanning and computer processing of 3D models were used to evaluate the quality of welded joints. Statistical modeling in the form of a two-factor experiment was also used in the work, with obtaining adequate regression equations of the infl uence of welding modes on the geometric parameters of the seam: the height of reinforcement and the width of the seam on the front and back of the joint. Results and discussion. The possibility of obtaining welding fl uxes from metallurgical slags of an electric steelmaking enterprise and its use for creating welded joints is shown. Optimal modes of arc welding of thin-walled sheet parts made of low-carbon steel with forced formation of a root roller on ceramic linings is established, ensuring the absence of internal defects in the form of pores, cracks and lacks of penetration, a minimum of residual deformations and compliance of the weld size with the requirements of the existing standard. The nominal values of the geometric parameters of the seam according to GOST 8713-79-C4 correspond to welding mode: welding speed 54 cm/min, welding current 550 A, arc voltage 30 V. The results of the work can be applied in metallurgical electric steelmaking enterprises producing low-carbon steel in the development of technologies for the use of welding materials from slag. For citation: Startsev E.A., Bakhmatov P.V. The infl uence of automatic arc welding modes on the geometric parameters of the seam of butt joints made of low-carbon steel, made using experimental fl ux. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 4, pp. 61–73. DOI: 10.17212/1994-6309-2023-25.4-61-73. (In Russian). ______ * Corresponding author Startsev Egor A., Senior lecturer Komsomolsk-na-Amure State University, 27 Lenin Ave., 681013, Komsomolsk-on-Amur, Russian Federation Tel.: +7 (914) 188-05-45, e-mail: egorstarts@inbox.ru References 1. Verkhoturov A.D., Babenko E.G., Makienko V.M. Metodologiya sozdaniya svarochnykh materialov [Methodology of creation of welding materials]. Khabarovsk, Far Eastern State Transport University Publ., 2009. 128 p. ISBN 978-5-262-00458-4. 2. Sviridova T.V., Bobrova O.B., Peryatinsky A.Yu., Nekerov E.A. Evaluation of the infl uence of slag heaps on the state of the urban residential area. IOP Conference Series: Materials Science and Engineering, 2019, vol. 537 (6). DOI: 10.1088/1757-899X/537/6/062009.
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