Investigation of the Influence of Energy Parameter of the Covered-Electrode Welding on the Impact Strength Characteristics and Cracking Resistance of the Welded Joints Obtained

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Justification: High-strength low-alloy steels are used in mechanical engineering, construction industry, shipbuilding, pipeline transport among others due to increased requirements for the performance characteristics of welded structures. The main method used in the construction of metal structures is arc welding, which has a significant impact on the properties of the weld zone, its structure and mechanical properties. At the same time, there is always a risk of various defects in the weld zone, which physical origin is diverse and difficult to predict. The purpose of the research is to find ways to improve performance of the high-duty structures by estimating the influence of energy parameters of the covered-electrode welding modes and the change of its control algorithms on the weld structure and the heat-affected zone, as well as the characteristics of the impact toughness and crack resistance of the resulting welded joints. Experiment technique: steel 09G2S specimen, obtained by electrode welding in the modes of direct current (DC) and low-frequency current modulation (LFM) are used to carry out tests. Optical microscopy combined with image analyzer is used to study the structure of welds, the heat-affected zone (HAZ) and the base metal (BM). As a part of the study the average grain size is determined. An analysis of fractures of different sections is carried out using scanning electron microscopy. Results: the assessment of the impact of the energy parameters of the covered-electrode welding modes on the characteristics of the impact toughness and crack resistance of welds, as the main indicators of the operational characteristics of the high-duty structures is taken. The dependence of the energy parameters of covered-electrode welding modes and the change of its control algorithms on the structure of the weld and heat affected zone is established. It is shown that the pulsed nature of changes in the energy parameters of the welding mode has a favorable effect on the heat capacity of the melt of the molten pool and the conditions of its crystallization. Testing of HAZ in static fracture toughness showed that all investigated compounds have high values in the whole temperature range: from +20 ? to -60 ?, even in the presence of defects such as fatigue cracks. The effective influence of welding performed in the low-frequency current modulation mode, as compared to DC welding, on the resistance to brittle fracture of welded joints made of low-carbon steels at low climatic temperatures is determined.

About the authors

Y. N. Saraev

Email: litsin@ispms.tsc.ru
D.Sc. (Engineering), Professor, Chief Researcher, Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, litsin@ispms.tsc.ru

S. V. Gladkovsky

Email: gsv@imach.uran.ru
D.Sc. (Engineering), Associate Professor, Institute of Engineering Science Ural Branch of Russian Academy of Sciences, gsv@imach.uran.ru

S. V. Lepikhin

Email: lsv@imach.uran.ru
Ph.D. (Engineering), Institute of Engineering Science Ural Branch of Russian Academy of Sciences, lsv@imach.uran.ru

I. S. Kamantsev

Email: ks@imach.uran.ru
Institute of Engineering Science Ural Branch of Russian Academy of Sciences, ks@imach.uran.ru

A. G. Lunev

Email: agl@ispms.ru
Ph.D. (Engineering), Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, agl@ispms.ru

M. V. Perovskaya

Email: mv_perovskaya@inbox.ru
Ph.D. (Engineering), Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, mv_perovskaya@inbox.ru

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