Browse > Article

Process Parameters of Butt Welding of SM45C using a Continuous Wave Nd:YAG Laser Beam  

유영태 (조선대학교 기전공학과)
노경보 (조선대학교 대학)
오용석 (조선대학교 대학)
김종신 ((주)이노테크닉)
임기건 (전남대학교 물리학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.20, no.7, 2003 , pp. 44-55 More about this Journal
Abstract
The Nd:YAG laser process is known to have high speed and deep penetration capability to become one of the most advanced welding technologies. This paper describes the machining characteristics of SM45C carbon steel welding by use of an Nd:YAG laser. In spite of its good mechanical characteristics, SM45C carbon steel has a high carbon contents and suffers a limitation in the industrial application due to the poor welding properties. The major process parameters studied in the present laser welding experiment were position of focus, travel speed and laser power. Optical microscope and SEM were used to investigate the microstructures of the welded zone. The experimental results showed that penetration depth of the welding process increases with laser power. Both the microstructural investigation and the theoretical calculations indicated that materials undergoes a very high heating and cooling cycle during welding process. It was also found that the austenite nucleation takes place at the initial stage and the completion temperature of austenite transformation is much higher than in the case of the arc welding.
Keywords
Nd:YAG laser; SM45C; Laser welding; Hot cracking;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Kim, Jae-Do, Kim, Cheol-Jung, Chung, Chin-Man, 'Repair welding of etched tubular components of nuclear power plant by Nd:YAG lasers,' Journal of Materials Processing Technology 114. pp. 51-56, 2001   DOI   ScienceOn
2 Havrilla, D., 'Laser welding of stainless tube,' Fabricator, Vol. 19, No. 6, pp. 24-25, 1999
3 XIE, J., KAR, A., 'Laser welding of Thin sheet steel with surface oxidation,' The Welding Journal Research Supplement, 348-s, 1999
4 Tzeng, Y.-F., 'Process Characterisation of Pulsed Nd:YAG laser seam welding,' The International Journal of Advanced Manufacturing Technology 16, pp. 10-18, 2000   DOI
5 Han, Sang-Gu, 'Metal Heat treatment Handbook, pp. 234-235
6 Bang, Han-Sur, Kim, Young-Pyo, 'A Study on the Weldability of S45C Medium Carbon Steel for Machine Structural Use by Nd:YAG Laser,' Proceeding of the 2001 Annual Autumn Meeting of Korean Welding Society, pp. 134-139, 2001   과학기술학회마을
7 Park, Sung-Do, 'Laser Manufacturing,' Daekwang Book, pp. 165-172, 1997
8 Kim, T. H., Laser Manufacturing, Kyung Moon, lpp. 154-215,1996
9 Loeffler, K., 'High power CW Nd:YAGs advance,' Industrial Laser Review, pp. 13-16, July 1996
10 Radj, D., Roller, R., Dilthey, U., Buxbaum, 'Laserschweissgerechtes Konstruieren in Stuttgart,' 1993
11 Jeong, H. C, 'Weld Hot Cracking in C-Mn Steel,' The Korean Welding Society, Vol. 17, No. 5, 1999   과학기술학회마을
12 Borland, J. C, 'Suggested explanation of hot cracking in mild and low alloy steel welds,' British Welding Journal, Vol. 8, pp. 526, 1961