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Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Plates

1
School of Aerospace and Mechanical Engineering, Korea Aerospace University, 76 Hanggongdaehang-ro, Deokyang-gu, Goyang-si 10540, Korea
2
A Plate Research Team of Dongkuk Steel R&D Center, 70 Geonposaneop-ro 3214 beon-gil, Daesong-myun, Nam-gu, Pohang 37874, Korea
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 551; https://doi.org/10.3390/met9050551
Received: 16 April 2019 / Revised: 2 May 2019 / Accepted: 9 May 2019 / Published: 11 May 2019
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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. View Full-Text
Keywords: anti-seismic steel; SN 490C; weldability; lamellar tear; window test; Cranfield test anti-seismic steel; SN 490C; weldability; lamellar tear; window test; Cranfield test
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Van, D.; Lee, S.H.; Kim, K.; Sim, H. Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Plates. Metals 2019, 9, 551.

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