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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 33 , No. 1

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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30, No. 2, pp. 134-141
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Apr 2021
Received 28 Jan 2021 Revised 03 Mar 2021 Accepted 10 Mar 2021
DOI: https://doi.org/10.7735/ksmte.2021.30.2.134
이종 폴리머 소재의 레이저 투과 용접 시 결함의 실험적 평가
최대철^a ; 신기훈^b^{, *} ; 한영구^b ; 홍민철^b ; 정성균^b ; 정종설^c ; 나기정^d ; 유호훈^e





Experimental Evaluation of Defects in Laser-Transmission Welding of Heterogeneous Polymer Materials
Dae Cheol Choi^a ; Ki-Hoon Shin^b^{, *} ; Young Gu Han^b ; Min Cheol Hong^b ; Seong-Kyun Cheong^b ; Jong-Seol Jeong^c ; Ki Jung Na^d ; Ho Hoon Ryu^e
aDepartment of Mechanical Engineering, Graduate School of Seoul National University of Science and Technology
bDepartment of Mechanical and Automotive Engineering, Seoul National University of Science and Technology
cR&D Planning Team, DAEEUN INDUSTRIAL Company Limited
dProduction Department, ALI Company Limited
eR&D Team, LABS
Correspondence to : ^*Tel.: +82-2-970-6320 E-mail address: shinkh@seoultech.ac.kr (Ki-Hoon Shin).



Funding Information ▼ Ministry of Trade, Industry and Energy Korea Industrial Complex Corporation PIC19002R1 Ministry of Education National Research Foundation of Korea 2018R1D1A1B07048196

Abstract

In this study, the laser process parameters were determined at which surface and sectional defects begin to occur during the laser-transmission welding of two heterogeneous polymer materials. Specifically, laser-transmission welding of PMMA and PC/ABS with thicknesses of 2 mm each was conducted using a thulium laser with a wavelength and focusing diameter of 2 μm and 1 mm, respectively. The experimental results show that the laser power at the time of defect occurrence also increases proportionally as the laser scan speed increases, but the corresponding energy density decreases. In addition, the ratio of the welding width to the laser diameter at defect occurrence slightly decreases from 1.25 to 1.13 with increasing scan speed. Based on the experimental results, it is necessary to increase the laser scan speed and power simultaneously within the allowable range in terms of energy efficiency and production time during laser-transmission welding.


Keywords: Laser transmission welding, Heterogeneous polymer, Defects, Weld width

Acknowledgments

본 연구는 2020년 정부(산업통상자원부)의 재원으로 한국산업단지공단의 지원(PIC19002R1) 및 2018년 정부(교육부)의 재원으로 한국연구재단의 지원(2018R1D1A1B07048196)을 받아 수행되었습니다.

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Dae Cheol Choi

Ph.D. candidate in the Department of Mechanical Engineering, Seoul National University of Science and Technology.His research interest includes laser shock surface patterning and nanomaterials.

E-mail: cdc4662@seoultech.ac.kr

Ki-Hoon Shin

Professor in the Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology.His research interest is laser applications, FGM material and metal 3D printing

E-mail: shinkh@seoultech.ac.kr

Young Gu Han

B.Sc. student in the Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology.His research interest is laser applications.

E-mail: dudrn0105@naver.com

Min Cheol Hong

B.Sc. student in the Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology.His research interest is laser applications.

E-mail: hmc516@naver.com

Seong-Kyun Cheong

Professor in the Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology.His research interest is composite materials.

E-mail: skjung@seoultech.ac.kr

Jong-Seol Jeong

Senior researcher in DAEEUN INDUSTRIAL Co., Ltd. His research interest is Mechanical design and development.

E-mail: seolimeng@hanmail.net

Ki Jeong Na

Director in ALI Co., Ltd. His research interest is laser transmission welding process.

E-mail: E-mail: dbs170@naver.com

Ho Hoon Ryu

Team manager in LABS. His research interest is laser applications.

E-mail: eric@labs.co.kr