Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Platesopen access
- Authors
- Van, Donghyun; Lee, Seung Hwan; Kim, Kihyuk; Sim, Hoseop
- Issue Date
- May-2019
- Publisher
- MDPI
- Keywords
- anti-seismic steel; SN 490C; weldability; lamellar tear; window test; Cranfield test
- Citation
- METALS, v.9, no.5, pp.1 - 16
- Indexed
- SCIE
SCOPUS
- Journal Title
- METALS
- Volume
- 9
- Number
- 5
- Start Page
- 1
- End Page
- 16
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2622
- DOI
- 10.3390/met9050551
- ISSN
- 2075-4701
- Abstract
- In this study, weldability and cracking susceptibility of SN 490C steel were firstly investigated. For this study, SN 490C thick plates which had been developed for anti-seismic steel of building structures were welded by flux-cored arc welding (FCAW) and submerged arc welding (SAW) processes based on welding conditions of actual construction site. Weldments using the plates with different thickness were produced using E71T-1C and EH14 filler wires, respectively. For the weldability tests, various welded joints such as butt and T-joints were examined. After welding, microstructure analysis was performed. Various microstructures were found depending on the location of the weldments. Heat effects by multi-pass welding were correlated with the microstructure. The microstructure was correlated with the hardness profile and the impact test result. In addition, the through-thickness tensile test, window test, and Cranfield test were conducted to evaluate sensitivity of lamellar tearing, which may occur during tensile restraint stress of welds. As a result of the tests, it was found that the SN 490C steel was sufficiently resistant to lamellar tearing.
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