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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27 , No. 1

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[ Article ]
Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 1, pp. 70-75
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Feb 2018
Received 19 Aug 2017 Revised 31 Oct 2017 Accepted 4 Dec 2017
DOI: https://doi.org/10.7735/ksmte.2018.27.1.70
CFD를 이용한 티타늄 박판 레이저 용접 퍼징장치의 성능예측에 관한 연구
진병주^a ; 박민호^a ; 윤태종^a ; 김일수^a^{, *} ; 박기영^b ; 김용^b ; 양해진^b


A Study on Performance Prediction of Purging Device using CFD in Laser Welding of Titanium Sheet
Byeong-Ju Jin^a ; Min-Ho Park^a ; Tae-Jong Yun^a ; Ill-Soo Kim^a^{, *} ; Ki-Young Park^b ; Young Kim^b ; Hae-Jin Yang^b
aDept. of Machanical Engineering, Mokpo National University, 1666, Yeongsan-ro, Chonggye-myeon, Muan, Jeonnam-do, 58579, Korea
bInstitute for Advanced Engineering, 175-28, Goan-ro, 51 beon-gil, Baegam-myeon, Cheoin-gu, Yongin, Gyeonggi-do, 17180, Korea
Correspondence to : ^Tel.: +82-61-454-3455, Fax: +82-61-454-6376, E-mail address:*ilsookim@mokpo.ac.kr (Ill-Soo Kim).



Funding Information ▼ National Research Foundation of Korea 2015R1D1A3A01020246

Abstract

As titanium generally combines with oxygen at high temperatures to form a brittle region, the performance of a purging device for shielding welds in titanium welding is an important factor. Therefore, this study is focused on investigating the performance of a purging device. The nozzle length is changed using CFD (Computational Fluid Dynamics) to confirm the shielding performance of the purging device, and the shielding performance is predicted by the volume fraction of the shielding gas at laser beam focus. Next, the quality of the primary welding workpiece is checked. In addition, a hardness test and a tensile test are conducted to confirm the change in mechanical properties according to the nozzle length. A comparison of the calculated and measured results confirmed that a good weld can be obtained when the laser beam focus is more than 67% shielded in the lap-joint welding of a titanium thin plate.


Keywords: Laser welding, Purging device, Titanium sheet, Prediction of shielding gas performance, Lap joint, Computational fluid dynamic

Acknowledgments

본 연구는 2015년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. 2015R1D1A3A01020246).

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