Influence of Welding Conditions and Different Current Sources on Formation of Welded Seam of Steel Austenitic Stainless Chromium-Nickel Steel

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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%.

About the authors

R. A. Mamadaliev

Email: Mamadaliev_it@mail.ru
Senior Lecturer, Tyumen Industrial University, Mamadaliev_it@mail.ru

V. N. Kuskov

Email: vnkuskov@yandex.ru
D.Sc. (Engineering), Professor, Tyumen Industrial University, vnkuskov@yandex.ru

P. V. Bakhmatov

Email: mim@knastu.ru
Ph.D. (Engineering), Associate Professor, Komsomolsk-na-Amure State University, mim@knastu.ru

D. P. Il’yashchenko

Email: mita8@rambler.ru
Ph.D. (Engineering), Yurga Institute of Technology, TPU Affiliate, mita8@rambler.ru

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