PSI - Issue 36

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDirect StructuralIntegrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2021) 000 – 000

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Procedia Structural Integrity 36 (2022) 247–253

© 2022 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 conference Guest Editors The results of the study of the effect of thermal cycles during multi-pass electroslag welding on mechanical properties of the weld metal and the heat affected zone (HAZ) are presented. It is shown that one of the ways to approximate the mechanical properties of the welded joint to the properties of the base metal without high-temperature heat treatment is to perform electroslag welding not in one but in several passes, when the heat released during each adjacent pass affects the previously welded sections, producing their partial heat treatment, improving the mechanical properties. Analysis of thermal cycles showed that the cooling rate of the metal HAZ of each weld within the temperature range 600...500°C (w 6/5 ) does not exceed critical values for 35L steel type, and also decreases with the welds overlapping, i.e., the danger of martensite formation in this zone is absent. It has been established that the effect of automatic heat treatment of welds results in the structure recrystallization, contributing to grain refinement in the overheating area of the heat transfer zone and weld metal and significant improvement of the mechanical properties. The results of impact bending tests (KCU) of the welded joints showed that the toughness impact in the areas of the weld metal, which have undergone the accompanying heat treatment, exceeds that one of the base metal, as well as the regulatory requirements, by 2...4 times. © 2022 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 conference Guest Editors Keywords: multi-pass electroslag welding, thermal cycle,heat-affected zone, automatic heat treatment, mechanical properties, impact toughness 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Influence of thermal cycles of repair electroslag welding on the structure and mechanical properties of joints of cast medium carbon steels Sergiy Kozulin, Ivan Lychko, Taras Maydanchuk*, Valentin Ilyushenko, Evgenia Lukianchenko E.О. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine , 11 KazimirMalevich St., Kyiv 03150, Ukraine Abstract The results of the study of the effect of thermal cycles during multi-pass electroslag welding on mechanical properties of the weld metal and the heat affected zone (HAZ) ar pr sented. It is shown that one of he ways to approximate the i l ti ed joint to t properties of the base metal without high- emperature eat tr atment is to perform electroslag welding not in n but in several passes, when t heat el ased during each adjacent pass affects the previously welded sections, produ ing their partial heat treatment, improving th mechanical propertie . Analysis of thermal cycle showed that the cooling rat of the metal HAZ of each weld within the temperature rang 600...500°C (w 6/5 ) does not exceed critical values for 35L steel yp , and also decreases with the welds overlapping, i.e., the danger of martensit formation in this zon is absent. It has been established tha the effect f automatic heat treatment of welds r sults in th structur recrystallizatio , contributing to grain refinement in the overheating ar a o the he t ransfer zone and weld metal an significant improvement of the mech nical properties. The results of i pact bending tests (KCU) of the welded joints sh w d that the toughness impact in the areas of the weld metal, which hav undergone the accompanying heat tr a ment, exceeds that one of the base me al, as well as the regul tory requi ments, by 2...4 times. © 2022 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 u der re ponsibility of t conference Guest Editors Keywords: multi-pass lectro lag welding, thermal cycle,heat-affected zone, automatic heat treatment, mechanical properties, impact toughness 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Influence of thermal cycles of repair electroslag welding on the structure and mechanical properties of joints of cast medium carbon steels Sergiy Kozulin, Ivan Lychko, Taras Maydanchuk*, Valentin Ilyushenko, Evgenia Lukianchenko E.О. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine , 11 KazimirMalevich St., Kyiv 03150, Ukraine Abstract

* Corresponding author. Tel.: +38-096-194-34-33; fax:+38-044-200-24-66. E-mail address: maydanchuk_taras@ukr.net * Corresponding author. Tel.: +38-096-194-34-33; fax:+38-044-200-24-66. E-mail ad ress: maydanchuk_taras@ukr.net

2452-3216 © 2022 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 conference Guest Editors 2452-3216 © 2022 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 u der re ponsibility of t conference Guest Editors

2452-3216 © 2022 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 conference Guest Editors 10.1016/j.prostr.2022.01.031