Obrabotka Metallov 2018 Vol. 20 No. 4

OBRABOTKAMETALLOV Vol. 20 No. 4 2018 44 TECHNOLOGY References 1. Wei H.L., Li H., Yang L.J., Gao Y., Ding X.P. Arc characteristics and metal transfer process of hybrid laser double GMA welding. International Journal of Advanced Manufacturing Technology , 2015, vol. 77, iss. (5–8), pp. 1019–1028. doi: 10.1007/s00170-014-6537-5. 2. Alencar Pires S. de, Campos M.F. de, Marcelo C.J., Xavier C.R. Secondary austenite precipitation during the welding of duplex stainless steels. Materials Science Forum , 2016, vol. 869, pp. 562–566. doi: 10.4028/www. scientific.net/MSF.869.562. Influence of Welding Conditions and Different Current Sources on Formation of Welded Seam of Steel Austenitic Stainless Chromium-Nickel Steel Rasul Mamadaliyev 1, a, * , Viktor Kuskov 1, b , Pavel Bakhmatov 2, c , Dmitriy Ilyashchenko 3, d 1 Tyumen Industrial University, 38 Volodarskogo, Tyumen, 625000, Russian Federation 2 Komsomolsk-na-Amure State University, 27 Lenin Prospect, Komsomolsk-on-Amur, 681013, Russian Federation 3 Yurga Institute of Technology, TPU Affiliate, 26 Leningradskaya st., Yurga, 652055, Russian Federation a https://orcid.org/0000-0003-0813-0961, Mamadaliev_it@mail.ru , b https://orcid.org/0000-0001-9690-7982, vnkuskov@yandex.ru , c https://orcid.org/0000-0002-4271-0428, mim@knastu.ru , d http://orcid.org/0000-0003-0409-8386, mita8@rambler.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2018 vol. 20 no. 4 pp. 35–45 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2018-20.4-35-45 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 14 June 2018 Revised: 25 June 2018 Accepted: 02 November 2018 Available online: 15 December 2018 Keywords : Manual arc welding Coated electrode Chemical composition Microstructure Chromium Nickel Magnesium Austenitic stainless chromium-nickel steel Welding rectifier Invertor Current source Current strength ABSTRACT Introduction. Energy impact exerted by the welding process on the joined parts made of austenite steel contributes to the unfavorable processes in the heat-affected zone (HAZ) of the welded joint, namely to the change of the structural-phase composition, burnout of alloying elements, reduction of strength characteristics, which is a prerequisite to the formation of nuclei of corrosion attack during operation and a decrease in mechanical characteristics of the welded structure. All known methods of enhancing corrosion resistance of welded joints influence only the weld metal, but have no significant influence the heat-affected zone state and do not change its corrosion resistance. The purpose of the work. Therefore, selection of welding conditions, reducing the burnout of alloying elements and shortening the HAZ extension is a relevant task. The paper studies the welded joints of austenitic stainless chromium-nickel steel obtained by welding using power sources that implement different forms of energy conversion: VDU-506 (traditional) and ARC 200i (high-frequency) with application of coated electrodes of ОК-61.30 grade. The research methods are spectral analysis of the chemical composition and metallographic studies of weld metal. Results and Discussion. It is revealed that the dynamic properties of power sources that implement different methods of energy conversion influence the chemical, structural and phase composition of the weld metal. It is established that the use of an inverter rectifier, as compared with a diode one, promotes a content increase in the weld metal: Mn by 14% and Cr by 3%; a decrease of the grain size in the weld metal by 40% and in the heat-affected zone by 44%; a reduction in the HAZ extension of the welded seam by 32%. For citation: Mamadaliyev R.A., Kuskov V.N., Bakhmatov P.V., Ilyashchenko D.P. Influence of welding conditions and different current sources on formation of welded seam of steel austenitic stainless chromium-nickel steel. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2018, vol. 20, no. 4, pp. 35–45. doi: 10.17212/1994-6309-2018-20.4-35-45. (In Russian). ______ * Corresponding author Mamadaliyev Rasul A. , Senior Lecturer Tyumen Industrial University 38 Volodarskogo, Tyumen, 625000, Russian Federation Tel.: 8 (929) 200-50-04, e-mail: Mamadaliev_it@mail.ru