PSI - Issue 20

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

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 20 (2019) 306–309

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence of the volume of deposited weld metal on the service life of the vertical steel tank in the North G.S Ammosov a, * and M.P. Lebedev b 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence of the volum of deposited weld metal on the service life of the vertical steel tank in the North G.S Ammosov a, * and M.P. Lebedev b ab V.P. Larionov Institute of the Physical-Technical Problems of the North of SB RAS,Oktyabrskaya street 1,Yakutsk 677890, Russia The structural and mechanical inhomogeneity of welded joints, design and technology defects, residual welding stresses and deformations introduced during the technological processes of constructing and repairing are common in welding vertical steel tanks. Hence, the problem of increasing the operational strength of welded joints is a crucial task. The present article describes the key stages of the structure formation of the metal of the heat-affected zone during the welding of low-alloyed steels used for tank manufacturing in the range of permissible cooling rates in the temperature range from 600 to 500°C. Based on the analysis of continuous cooling transformation diagrams and using the expression for finding the volume of deposited metal during welding in the range of permissible cooling rates, the weld deposit area was calculated. The hardness values are obtained using continuous cooling transformation diagrams for specific grades of steel. It has been established that the strength characteristics change depending on the volume of the deposited weld metal. We have provided graphs that allow determining the mechanical properties of the heat-affected zone metal by area of the weld deposit. The form of a weld is determined from the area found at the optimum rate of cooling temperature, which ensures acceptable cold resistance and strength of the heat-affected zone metal. Subsequently, the volume of deposited weld metal could significant influence the service life of the tanks, taking into account the stress concentrators. The structural and mechanical inhomogeneity of welded joints, design and technology defects, residual welding stresses and deformations introduced during the technological processes of constructing and repairing are common in welding vertical steel ta s. Hence, the problem of increasing the operational strength of welded joints is a crucial task. The present article describes the key stages of the structure formation of the metal of the heat-affected zone during the welding of low-alloyed steels used for tank manufacturing in the range of permissible cooling rates in the temperature range from 600 to 500°C. Based on the analysis of continuous cooling transformation diagrams and using the expression for finding the volume of deposited metal during welding in the range of permissible cooling rates, the weld deposit area was calculated. The hardness values are obtained using continuous cooling transformati diagrams for specific grades of steel. It has been established that the strengt characteristics change depending on the volu e of the deposited weld metal. We have provided graphs that allow determining the mechanical properties of the heat-affecte zone metal by area of the weld deposit. The form of a weld is determined from the area found at the optimum rate of cooling temperature, which ensures acceptable cold resistance and strength of the heat-affected zone metal. Subsequently, the volume of deposited weld metal could significant influence the service life of the tanks, taking into account the stress concentrators. ab V.P. Larionov Institute of the Physical-Technical Problems of the North of SB RAS,Oktyabrskaya street 1,Yakutsk 677890, Russia 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. P er-review under responsibility of t ILEE-2019 organizers

Keywords: tank manufacturing; welding; heat-affected zone; mechanical properties; weld section; volume of deposited weld metal; cooling; weld deposit area Keywords: tank manufacturing; welding; heat-affected zone; mechanical properties; weld section; volume of deposited weld metal; cooling; weld deposit area

* Corresponding author. Tel.: +7-914-226-8991; E-mail address: ammosov.g@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 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Corresponding author. Tel.: +7-914-226-8991; E-mail address: ammosov.g@mail.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.156