PSI - Issue 20

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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ScienceDirect

Procedia Structural Integrity 20 (2019) 174–179

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Study of the structure of the 09G2S grade steel welded joints performed by welding at subzero temperatures Ekaterina M. Maksimova* Federal Research Centre “The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences”, 2, Petrovskogo str., Yakutsk, 677980, Russia 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Study of the structure of the 09G2S grade steel welded joints performed by welding at subzero temperatures Ekaterina M. Maksimova* Federal Research Centre “The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences”, 2, Petrovskogo str., Yakutsk, 677980, Russia The specific features of the building of construction for responsible purpose in the conditions of the North are connected with the need to carry out welding works at negative ambient temperatures. In this regard, the issue of assessing their impact on the structure of welded joints is relevant. For research, plates of 09G2S steel, 12 mm thick, were welded. Plates with dimensions 200x300x12, bevel angle of edges (25 ± 2) °, were assembled butted with a gap of 1.6 mm. Welding was carried out in three passes using two different electrodes with a diameter of 3.0 mm for forming the root layer and 4.0 mm for forming the filling and facing layers. The research article investigates the heat-affected zone (HAZ) microstructure of welded joints obtained by manual arc welding at an ambient temperature of + 20° C and – 45° C. The features of the ambient temperature influence on the HAZ microstructure of 09G2S grade steel welded joints are revealed. The specific features of the building of construction for r sponsible purpose in the conditions of the North are connected with t need to carry out welding works at negative ambient t mperatures. In this regard, the issue of assessing their impact on the structure of weld d joints is relevant. For research, plates of 09G2S steel, 12 mm thick, were welded. Plates with dimensions 200x300x12, bevel angle of edges (25 ± 2) °, were assembled butted with a gap of 1.6 mm. Welding was carried out i three passes using two different electrodes with diam ter of 3.0 mm f r forming the root layer and 4.0 mm f r forming the filling and fa ing layers. The research article inv stigates the heat-affected zon (HAZ) microstructure of welded joints obtained by manual arc welding at an ambient temperature of + 20° C and – 45° C. The features of the ambient temperature influence on the HAZ microstructure of 09G2S grade steel welded joints are revealed. Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

Keywords: Welded joint; Arc welding; Heat-affected zone; Structure; Low-alloy steel. Keywords: Welded joint; Arc welding; Heat-affected zone; Structure; Low-alloy steel.

1. Introduction To ensure a normal welding process in cold conditions, it is necessary to take into account the features of weld formation at low temperatures, which can adversely affect the structure, mechanical properties and continuity of welded joints as reported by Efimenko (2011). The nature of the flow of thermal processes determines the conditions 1. Introduction To ensure a normal welding process in cold conditions, it is necessary to take into account the features of weld formation at low temperatures, which can adversely affect the structure, mechanical properties and continuity of welded joints as reported by Efimenko (2011). The nature of the flow of thermal processes determines the conditions

* Corresponding author. E-mail address: nikiforova_em@mail.ru * Correspon ing author. E-mail address: nikiforova_em@mail.ru

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452 3216 © 2019 Th Author(s). Publis d by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.135