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논문 기본 정보

자료유형
학술저널
저자정보
Jae-Hyeon Park (Pukyong National University) Myung-Jin Kim (HUBIS) Heeshin Kang (Korea Institute of Machinery and Materials) Wonah Park (Kyungsung University) Eun-Joon Chun (Pukyong National University)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第41卷 第5號
발행연도
2023.10
수록면
367 - 378 (12page)

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초록· 키워드

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Solidification cracking during lithium-ion battery packaging was metallurgically investigated, specifically for Cu-steel dissimilar materials. To this end, single-mode fiber and green lasers were employed under heat input conditions ranging from 1.3 to 8.0 J/mm. For both laser welds, solidification cracking was concentrated in the steel region of the fusion zone, particularly in the locally Cu-depleted region, regardless of the welding condition. Modified self-restraint tests were performed for overlapping dissimilar material combinations to elucidate the mechanism of solidification cracking. Analysis of the solidification cracking surface revealed that approximately 15–30 mass% Cu existed on the surface. Cu was highly enriched with a droplet shape, formed during solidification within the miscibility gap. By calculating the non-equilibrium weld mushy zone range based on the diffusion-controlled Scheil’s model, the solidification cracking in the Cu-depleted region was estimated at 453 K. It was strongly affected by the severe segregation of Cu (95.7 mass%) in the residual liquid at the terminal stage of the solidification path. Therefore, from a welding metallurgical perspective, homogeneous Cu distribution and minimization of Cu segregation within the fusion zone are essential for suppressing or minimizing the solidification cracking susceptibility of Cu–steel dissimilar laser welding.

목차

Abstract
1. Introduction
2. Materials and methods
3. Results and discussion
4. Conclusion
References

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