PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 93–99

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Abstract During welding, the ambient air temperature can significantly affect the obtained structures and mechanical properties of the welded joint. The given paper presents the results of the analysis of the structural and phase composition of welded joints obtained by the method of pulse-arc welding at a sub-zero ambient temperature. The effect of ambient temperature on the structure of the weld metal and the heat-affected zone during welding is investigated. The issue concerns structural low-carbon and low alloy steels. The microstructure is examined by scanning electron microscopy. The specifics of the effect of the modulation frequency of the welding current and the welding temperature on the microstructure of welded joints of structural steels of 09Mn2Si and St3sp grades are revealed. The present work allows conducting further research on the areas of the heat affected zone, which will make it possible to evaluate their effect on the mechanical properties of the welded joint as a whole. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: structural steel; microstructure; negative temperature; heat-affected zone; pulse-arc welding IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Investigation of the structure of welded joints performed at negative ambient air temperatures Nikolay I. Golikov a , Ekaterina M. Maksimova a,b, *, Yuri N. Saraev c a Larionov Institute of Physical-Technical Problems of the North SB RAS, 1 Oktyabrskaya St., Yakutsk, 677980, Russia b Federal Research Centre “The Yakut Scientific Centre SB RAS”, 2 Petrovskogo St., Yakutsk, 677000, Russia c Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, 2/4, Academichesky ave., Tomsk, 634021, Russia

* Corresponding author. Tel.: +7-411-235-8869. E-mail address: nikiforova_em@mail.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.016