Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties

Shin, Won-Sang; Cho, Dae-Won; Jung, Donghyuck; Kang, Heeshin; Kim, Jeng O; Kim, Yoon-Jun; Park, Changkyoo

doi:10.3390/met11050831

Open AccessArticle

Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties

by

Won-Sang Shin

^1,†,

Dae-Won Cho

^2,†,

Donghyuck Jung

¹,

Heeshin Kang

³,

Jeng O Kim

³,

Yoon-Jun Kim

^1,*

and

Changkyoo Park

^3,*

¹

Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea

²

Busan Machinery Research Center, Korea Institute of Machinery and Materials, Busan 46744, Korea

³

Laser and Electron Beam Application Department, Korea Institute of Machinery and Materials, Daejeon 34103, Korea

^*

Authors to whom correspondence should be addressed.

^†

Won-Sang Shin and Dae-Won Cho contributed equally to this work.

Metals 2021, 11(5), 831; https://doi.org/10.3390/met11050831

Submission received: 16 April 2021 / Revised: 11 May 2021 / Accepted: 17 May 2021 / Published: 19 May 2021

(This article belongs to the Special Issue Numerical Simulation of Metals Welding Process)

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Abstract

The pulsed laser welding of Al ribbon to Cu sheet was investigated for the electrical interconnections in power electronic modules. The various experimental conditions with the different laser powers, scan speeds, and heat inputs were employed for obtaining the defect-free Al/Cu joints. During the Al/Cu laser welding, the intermetallic compounds were formed in the welding zone. An electron probe microanalyzer and transmission electron microscopy confirmed the phases of intermetallic compounds, which were found to be Al₄Cu₉, Al₂Cu, AlCu, etc. The computational fluid dynamics simulation revealed that the Marangoni effect induced the circulation of the molten pool, resulting in the mixture of Al and Cu and the formation of swirl-like structures at the Al/Cu joints. The tensile shear strengths and electrical resistances of the Al/Cu joints were measured, and they showed a strong correlation with the welding area. A decrease in mechanical strength and an increase in electrical resistance were measured with increasing the welding area of Al/Cu joints. Moreover, the process window for the defect-free Al/Cu joints was developed, and the experimental conditions for Al/Cu laser braze-welding were examined to minimize the intermetallic compounds formation at the Al/Cu joints.

Keywords: laser welding; aluminum; copper; ribbon bonding; intermetallic compounds

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MDPI and ACS Style

Shin, W.-S.; Cho, D.-W.; Jung, D.; Kang, H.; Kim, J.O.; Kim, Y.-J.; Park, C. Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties. Metals 2021, 11, 831. https://doi.org/10.3390/met11050831

AMA Style

Shin W-S, Cho D-W, Jung D, Kang H, Kim JO, Kim Y-J, Park C. Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties. Metals. 2021; 11(5):831. https://doi.org/10.3390/met11050831

Chicago/Turabian Style

Shin, Won-Sang, Dae-Won Cho, Donghyuck Jung, Heeshin Kang, Jeng O Kim, Yoon-Jun Kim, and Changkyoo Park. 2021. "Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties" Metals 11, no. 5: 831. https://doi.org/10.3390/met11050831

APA Style

Shin, W.-S., Cho, D.-W., Jung, D., Kang, H., Kim, J. O., Kim, Y.-J., & Park, C. (2021). Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties. Metals, 11(5), 831. https://doi.org/10.3390/met11050831

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Investigation on Laser Welding of Al Ribbon to Cu Sheet: Weldability, Microstructure, and Mechanical and Electrical Properties

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