학술논문
Nd:YAG 레이저빔을 이용한 SCP 강판과 STS304강판 용접시 오프셋(off-set) 위치 결정에 관한 연구
이용수 30
- 영문명
- A study of the determination of off-set position for Nd:YAG laser welding between SCP steel sheet and STS304 sheet
- 발행기관
- 한국레이저가공학회
- 저자명
- 윤부선(B. S. Yoon) 김도훈(T. H. Kim) 박기영(G. Y. Park) 이경돈(G. D. Lee)
- 간행물 정보
- 『한국레이저가공학회지』한국레이저가공학회지 제7권 제2호, 1~9쪽, 전체 9쪽
- 주제분류
- 공학 > 기계공학
- 파일형태
- 발행일자
- 2004.08.01
4,000원
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국문 초록
영문 초록
This work was attempted to join SCP sheet and STS304 sheet by using Nd:YAG laser beam. SCP sheet has good formability and low cost, while STS304 has excellent corrosion resistance and mechanical properties in high temp. In this experiment, butt joint type was used to develop the tailored blank welding for dissimilar steel. Sheets which have different thermal properties.
Computer simulation was conducted to obtain the off-set position for efficient welding by considering laser power, scanning speed, focal length and basic properties. The result showed that the optimum thermal distribution was obtained when the laser beam was irradiated at 0.05 ~ 0.1 ㎜ off-set toward the SCP sheet side.
The experiment was conducted based on the result of computer simulation to show the same optimum conditions. Optimum conditions were 3KW in laser beam power, 6m/min in scanning speed, -0.5㎜ in focal position, 0.1㎜ off-set toward SCP. Microhardness test, tensile test, bulge test, optical microscopy, EDS, and XRD were performed to observe the microstructure around fusion zone and to evaluate the mechanical properties of optimum conditions.
The weld zone had high microhardness values by the formation of the martensitic structure. Tensile test measured the strength of welded region by vertical to strain direction and the elongation of welded region by parallel to strain direction.
Bulge test showed 52% formability of the original materials. Bead shape, grain size, and martensitic structure were observed by the optical microscopy in the weld zone. Detailed results of EDS, XRD confirmed that the welded region was connected of martensitic structure.
Computer simulation was conducted to obtain the off-set position for efficient welding by considering laser power, scanning speed, focal length and basic properties. The result showed that the optimum thermal distribution was obtained when the laser beam was irradiated at 0.05 ~ 0.1 ㎜ off-set toward the SCP sheet side.
The experiment was conducted based on the result of computer simulation to show the same optimum conditions. Optimum conditions were 3KW in laser beam power, 6m/min in scanning speed, -0.5㎜ in focal position, 0.1㎜ off-set toward SCP. Microhardness test, tensile test, bulge test, optical microscopy, EDS, and XRD were performed to observe the microstructure around fusion zone and to evaluate the mechanical properties of optimum conditions.
The weld zone had high microhardness values by the formation of the martensitic structure. Tensile test measured the strength of welded region by vertical to strain direction and the elongation of welded region by parallel to strain direction.
Bulge test showed 52% formability of the original materials. Bead shape, grain size, and martensitic structure were observed by the optical microscopy in the weld zone. Detailed results of EDS, XRD confirmed that the welded region was connected of martensitic structure.
목차
Abstract
Ⅰ. 서론
Ⅰ. 실험방법
Ⅲ. 실험결과 및 고찰
Ⅳ. 결론
참고문헌
Ⅰ. 서론
Ⅰ. 실험방법
Ⅲ. 실험결과 및 고찰
Ⅳ. 결론
참고문헌
키워드
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