Submerged arc welding process peculiarities in application for Arctic structures

Paul Kah; Pavel Layus; Benoit Ndiwe; Paul Kah; Pavel Layus; Benoit Ndiwe

doi:10.3934/matersci.2022029

AIMS Materials Science

2022, Volume 9, Issue 3: 498-511. doi: 10.3934/matersci.2022029

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Submerged arc welding process peculiarities in application for Arctic structures

1.
Department of Engineering Science, University West, SE-461 86 Trollhättan, Sweden
2.
MS-Steel Oy, Hemming Elfvingin tie 1, FI-10960 Hanko, Finland
3.
Department of Mechanical Engineering, ENSET Douala, University of Douala, PO Box: 1872, Douala, Cameroon

Received: 18 February 2022 Revised: 21 May 2022 Accepted: 01 June 2022 Published: 24 June 2022

The paper focuses on the submerged arc welding (SAW) process in application to structures for Arctic conditions. One of the technical challenges for modern Arctic structures is to produce high-quality welds since a weld is usually the weakest part of any structure. Welding is especially difficult for the high strength steels (HSS), which are used in structures for weight-reduction purposes. The objective of the study is to explore the usability, development possibilities and parameters of SAW process for welding of thick cold-resistant HSS plates. Meeting this objective required in-depth understanding of the welding and material science background, which includes the quality requirements of weld joints intended for Arctic service as described in various standards, properties of cold-resistant HSS and description of testing methods used to validate welding joints for low temperature conditions. The study describes experimental findings that improve understanding of SAW process of thick quenched and tempered (QT) and thermo-mechanically processed (TMCP) HSS plates. Experiments were conducted to develop SAW procedures to weld several thick (exceeding 25 mm) high strengths (580–650 MPa tensile strength) cold-resistant (intended operational temperature at least −40 ℃) steel grades. The welds were evaluated by a wide range of industrial tests: analyses of chemical, microstructural and mechanical properties; hardness tests; and cold resistance evaluation tests: the Charpy V-notch impact test and the Crack tip opening displacement (CTOD) test. Acceptable welding parameters and recommendations were developed, and the results of the experiments show that high quality welds can be obtained using heat input up to 3.5 kJ/mm.
- submerged arc welding,
- Arctic structures,
- high strength steels,
- arc welding,
- heat-affected zone
Citation: Paul Kah, Pavel Layus, Benoit Ndiwe. Submerged arc welding process peculiarities in application for Arctic structures[J]. AIMS Materials Science, 2022, 9(3): 498-511. doi: 10.3934/matersci.2022029

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Abstract

The paper focuses on the submerged arc welding (SAW) process in application to structures for Arctic conditions. One of the technical challenges for modern Arctic structures is to produce high-quality welds since a weld is usually the weakest part of any structure. Welding is especially difficult for the high strength steels (HSS), which are used in structures for weight-reduction purposes. The objective of the study is to explore the usability, development possibilities and parameters of SAW process for welding of thick cold-resistant HSS plates. Meeting this objective required in-depth understanding of the welding and material science background, which includes the quality requirements of weld joints intended for Arctic service as described in various standards, properties of cold-resistant HSS and description of testing methods used to validate welding joints for low temperature conditions. The study describes experimental findings that improve understanding of SAW process of thick quenched and tempered (QT) and thermo-mechanically processed (TMCP) HSS plates. Experiments were conducted to develop SAW procedures to weld several thick (exceeding 25 mm) high strengths (580–650 MPa tensile strength) cold-resistant (intended operational temperature at least −40 ℃) steel grades. The welds were evaluated by a wide range of industrial tests: analyses of chemical, microstructural and mechanical properties; hardness tests; and cold resistance evaluation tests: the Charpy V-notch impact test and the Crack tip opening displacement (CTOD) test. Acceptable welding parameters and recommendations were developed, and the results of the experiments show that high quality welds can be obtained using heat input up to 3.5 kJ/mm.

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