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Study on the Effect of the Localized Electrode Degradation on Weldability During an Electrode Life Test in Resistance Spot Welding of Ultra-High Strength Steel
초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
Jae-Won Kim, Siva Prasad Murugan, Nam Hyun Kang, Yeong-Do Park
김재원, Siva Prasad Murugan, 강남현, 박영도
Korean J. Met. Mater. 2019;57(11):715-725.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.715

Abstract
Evaluation of electrode degradation in resistance spot welding of 1180TRIP steel was carried out through an electrode life test, and weldability testing was performed by the measurement of the nugget size, the peak load analysis and the measurement of the electrode tip size at 30 intervals. Analysis of the change..... More

                        
Mechanical Performance and Microstructure of Resistance Element Welds of Dissimilar Metals Created with a Headless Rivet
Young Hyun Oh, Hyun Jung Ryu, Taejung Kim, Minsu Choi, Taeseon Lee
Korean J. Met. Mater. 2019;57(11):708-714.   Published online 2019 Oct 8
DOI: https://doi.org/10.3365/KJMM.2019.57.11.708

Abstract
Resistance Element Welding (REW) is a novel processing technology developed to join dissimilar materials such as aluminum and steel. It uses an auxiliary steel rivet (element) inserted into an aluminum sheet that forms a resistance spot weld with the steel sheet, and the aluminum work piece is mechanically joined by..... More

                        
Study of the Corrosion Behaviour, Liquid Metal Embrittlement and Resistance Spot Weldability of Galvannealed Hot Stamping Steel
합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
Yeonjung Hwang, Chang Wook Lee, Ga-Young Shin, Ji Hong Yoo, Minsu Choi
황연정, 이창욱, 신가영, 유지홍, 최민수
Korean J. Met. Mater. 2019;57(3):193-201.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.193

Abstract
The hot stamping process is beneficial for fabricating high strength automotive parts without spring back. To suppress high temperature oxidation and decarburization, it is necessary to coat the hot stamping steel. In the present work, the performance of galvannealed coated (GA) hot stamped steel was evaluated. During cyclic corrosion tests,..... More

                        
Al-10% Si 30MnB5
손 성 국, 황 연 정, 이 창 욱*, 유 지 홍, 최 민 수

Received 2019 Aug 22     Accepted 2019 Oct 6     Published online 2019 Oct 8
Abstract
Hot stamping is the most efficient manufacturing process to produce high strength automotive parts with reduced springback. Recently, 30MnB5 steel has been developed for hot stamping steel which can provide above 1700 MPa. However, resistance spot weldability of this steel is insufficient due to large amount of carbon addition. In... More
      
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