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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국마린엔지니어링학회 Journal of Advanced Marine Engineering and Technology (JAMET) 한국박용기관학회지 제28권 8호
발행연도
2004.11
수록면
86 - 94 (9page)

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This paper describes the effectiveness of laser pulse shaping in eliminating weld defects such as porosity, cracks and undercuts in pulsed Nd: YAG laser welding. A large porosity was formed in a keyhole mode of deeply penetrated weld metal of any stainless steel. Solidification cracks were present in STS 310S with above 0.017%P and undercuts were formed in ST8 303 with about 0.3%S. The conditions for the formation of porosity were determined in further detail in STS 316. With the objectives of obtaining a fundamental knowledge of formation and prevention of weld defects, the fusion and solidification behavior of a molten puddle was observed during laser spot welding of STS 3108 through a high speed video photographing technique. It was deduced that cellular dendrite tips grew rapidly from the bottom to the surface. and consequently residual liquid remained at the grain boundaries in wide regions and enhanced the solidification cracking susceptibility. Several laser pulse shapes were investigated and optimum pulse shapes were proposed for the reduction and prevention of porosity and solidification cracking.

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Abstract

1. Introduction

2. Materials and Experimental Procedure

3. Experimental Results and Discussion

4. Conclusion

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