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Bang, HanSur,Bang, HeeSeon The Korean Welding and Joining Society 2015 대한용접·접합학회지 Vol.33 No.2
This study examined the welding residual stress and fracture toughness of 78mm thick steel electro gas welding (EGW) and flux cored arc welding (FCAW) welded joints by numerical analyses of the thermal elasto-plastic behavior and fracture toughness(KIC). The residual stress, fracture toughness characteristics and production mechanism on the welded joints were clarified. Moreover, the effects of the welding process (EGW and FCAW) on the welding residual stresses and fracture toughness of welded joints were evaluated. The results showed that the new welding process (EGW) appears to be an effective substitute for the existing welding process (FCAW) in a thick steel plate with high strength.
내로우 갭 적용을 위한 핫와이어 송급 레이저용접 - 고속촬영을 통한 와이어 용융/이행 현상과 아크 포메이션 분석 -
Kim, Kyounghak,Bang, Hansur,Bang, Heeseon,Kaplan, Alexander F.H.,Nasstrom, Jonas,Frostevarg, Jan 대한용접접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.
Jaewoo Cho,Taehyun Lee,Heeseon Bang,Soongkeun Hyun,Cheolhee Kim 대한용접·접합학회 2024 대한용접·접합학회지 Vol.42 No.1
Electric vehicles have recently taken center stage, driven by growing environmental concerns, with a key focus on ensuring the reliability of their batteries. The materials used in the electrical connections of secondary batteries predominantly consist of Al and Cu alloys, necessitating the joining of both similar and dissimilar materials. This paper presents a technical review on laser welding technology applied to the challenging Al/Cu dissimilar metal combination. The complexity arises from the formation of brittle phases in intermetallic compounds and the low absorption of laser beams by the base materials. The characteristics of various laser welding modes and their effective monitoring through deep learning are explained in detail. The development of real-time laser welding monitoring technology is crucial to increase productivity and enable the mass production of reliable electric vehicle battery systems.
김경학(Kyounghak Kim),방한서(Hansur Bang),방희선(Heeseon Bang),Alexander F. H. Kaplan,Jonas Nasstrom,Jan Frostevarg 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.