PSI - Issue 30

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 154–161

© 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 A comprehensive methodology for estimating the technological strength of welded joints are developed based on parameters reflecting the welding technology, weldability, hydrogen, force and deformation conditions for welding and other informative parameters that correlate with the characteristics of the welded joint, as well as improving existing methods for estimating the technological strength of welded joints connections through the introduction of modern equipment and non-destructive testing systems. It has been established that the proposed comprehensive estimation methodology will allow reaching a new qualitative level in assessing the technological strength of a welded joint using modern equipment and measuring instruments. According to the results of the experimental work, it was found that when welding at low temperatures, the increase in the probability of the formation and development of cold cracks is mainly determined by the critical content of diffusible hydrogen in the weld metal, depending on the structural and force parameters of the welded joints. © 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: estimation of the technological strength of welded joints; delayed fracture; acoustic emission; diffusion hydrogen. 1. Introduction The process of formation and development of cracks under the long-term action of static loads leading to the destruction of welded structures at nominal stresses below the yield strength is called delayed fracture. Most of the joints in welding at low temperatures Sleptsov G.N. a, *, Mikhailov V.E. b , Sivtsev M.N. a a Larionov Institute of the Physical-Technical Problems of the North SB RAS, Oktyabrskaya St. 1, Yakutsk, 677890, Russia b Institute of Physics and Techn logy, Department of Physics of Materials and Welding Technologies, North-Eastern Federal University, Belinsky St. 58, Y kutsk, 677027, Russia Abstract A comprehensive methodology for estimating the technological strength of welded joints are developed based on parameters reflecting the w lding techn logy, weldability, ydroge , for e and deformation conditions for welding and other infor a ive parameters that correla with the character stics of the welded joint, as well as improv ng existing methods f r st mating th technological strength of elded joints onnections rough the introduction of modern equipme t and n n-destructive testing systems. It ha b en established that the proposed comprehensive estimation methodology will allow reachi g a new qualita ve level in assessing the technological strength of a welded joint using modern equipment and measuring instruments. According to the result of the experimental work, it was found that whe welding at low temperatures, th increase in the probability of the formation and d velopment of cold cracks is mainly determined by the critical content of diffusible hydrogen in the weld me al, depending o th structural and f rce parameters of the welded joints. © 2020 The Authors. P blishe 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 responsibility of EURASTRE COLD - 2020 guest editors K ywords: estimation of the technological strength of welded joints; delayed fractur ; acoustic emission; diffusion hydrogen. 1. Introduction The process of formation and development of cracks under the long-term action of static loads leading to the destruction of welded structures at nominal stresses below the yield strength is called delayed fracture. Most of IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Complex methods of estimation technological strength of welded joints in welding at low temperatures Sleptsov G.N. a, *, Mikhailov V.E. b , Sivtsev M.N. a a Larionov Institute of the Physical-Technical Problems of the North SB RAS, Oktyabrskaya St. 1, Yakutsk, 677890, Russia b Institute of Physics and Technology, Department of Physics of Materials and Welding Technologies, North-Eastern Federal University, Belinsky St. 58, Yakutsk, 677027, Russia IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Complex methods of estimation technological strength of welded

* Corresponding author. Tel.: +7 (4112) 39-05-94, +7 (4112) 39-06-19; fax: +7 (4112) 33-66-08. E-mail address: slepzovgn@mail.ru * Corresponding author. Tel.: +7 (4112) 39-05-94, +7 (4112) 39-06-19; fax: +7 (4112) 33-66-08. E-mail address: slepzovgn@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 u der the responsibility of the EURASTRENCOLD - 2020 gu st 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.2020.12.024