PSI - Issue 30

Nikolay I. Golikov et al. / Procedia Structural Integrity 30 (2020) 93–99 Author name / Structural Integrity Procedia 00 (2020) 000–000

99

7

3. When welding 09Mn2Si steel at low climatic temperatures, up to – 45 °C, it is required to increase the heat input in the range from 10 to 20% compared with welding modes performed at a positive temperature. In this case, increased heat input compensates the "cooling" effect of the ambient temperature, which contributes to the most reasonable cooling rate of the welded product. As a result, the required structural state of welded joints is achieved. Due to the studies conducted, it is possible to determine rational welding modes depending on the climatic conditions during welding and define the most dominant criteria for their influence on construction performance. Thus, the present research is a critical stage in the work aimed at improving the performance of welded metal structures operating in the North and the Arctic. Acknowledgements The studies were accomplished at the expense of the RSF project No. 16-19-10010P, as well as the work program according to the Cooperation Agreement of November 6, 2019, between the Institute of Strength Physics and Materials Science SB RAS and the Federal State Budgetary Institution of Science Federal Research Centre “The Yakutsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences”. References Chen, C., Fan, C., Cai, X., Lin, S., Yang, C., Zhuo Y., 2020. Microstructure and mechanical properties of Q235 steel welded joint in pulsed and un-pulsed ultrasonic assisted gas tungsten arc welding, Journal of Materials Processing Tech 275, 116335. Golikov, N.I., Maksimova, E.M., Saraev, Yu.N., 2019. Investigation of the microstructure of the heat-affected zone of low-alloyed steel during pulsed arc welding under conditions of low climatic ambient temperatures, IOP Conf. Series: Materials Science and Engineering 681, 012015. Mao, G. et al., 2019. Effect of cooling conditions on microstructures and mechanical behaviors of reheated low-carbon weld metals, Materials Science and Engineering A 744, 671-681. Mirzaei, M., Jeshvaghani, R.Arabi, Yazdipour, A., Zangeneh-Madar, K., 2013. Study of welding velocity and pulse frequency on microstructure and mechanical properties of pulsed gas metal arc welded high strength low alloy steel. Materials & Design 51, 709-713. Saraev, Yu.N., Bezborodov, V.P., Grigorjeva, A.A., Lebedev, V.A., Maksimov, S.Yu., Golikov, N.I., 2015. Management of the structure and properties of welded joints of engineering critical systems by the methods of adaptive pulse-arc welding, Materials Sciences Issues 1, 127 132. Saraev, Yu.N., Golikov, N.I., Sidorov, M.M., Maksimova, E.M., Semenov, S.V., Perovskaya, M.V., 2017. Exploratory research of reliability improvement of high-duty welded metal constructions operated under the conditions of the North, Obrabotka metallov 4, 30–42. Saraev, Yu.N., Lebedev, V.A., Novikov, S.V., 2016. Analysis of the existing methods for controlling the weld metal structure, Russian Internet Journal of Industrial Engineering 1, 16-26. Saraev, Yu.N., Solodskiy, S.A., Ulyanova, O.V., 2016. Improving Processes of Mechanized Pulsed Arc Welding of Low-Frequency Range Variation of Mode Parameters, IOP Conf. Series: Materials Science and Engineering 127, 012019 Wang, Q., Qi, B., Cong, B., Yang, M., 2017. Output characteristic and arc length control of pulsed gas metal arc welding process, Journal of Manufacturing Processes 29, 427-437.