• Title/Summary/Keyword: ND:YAG LASER

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Comparison of Characteristics on Induction and Continuous Nd:YAG Laser Surface hardening of SM45C Steel (SM45C강의 연속파 Nd:YAG레이저표면경화와 고주파표면경화특성 비교)

  • Shin H.J.;Yoo Y.T.;Ahn D.G.;Shin B.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.176-183
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    • 2005

  • Laser heat treatment technology is used for improving the feature of fatigue resistance and wear resistance in mobile parts. The purpose of this study is to compare the characteristics of laser heat treatment and high frequency heat treatment, which is commonly used in industrial place. For the preemptive experiment, the distribution, depth and size of hardening and its micro-structural features were compared between surface heat treatment case by defocusing and variables of each process for heat treatment by exclusively manufactured heat treatment optical system. As a result, high frequency heat treatment has wide distribution of hardening depth and width about 3 times larger than laser heat treatment, however, its average hardness showed 621.4Hv which is smaller than the average hardness of laser heat treatment with 691Hv.

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Characteristics of the Nd:YAG laser Spot Welding in $Cu_{54}Ni_{6}Zr_{22}Ti_{18}$ Bulk Metallic Glass Alloy ($Cu_{54}Ni_{6}Zr_{22}Ti_{18}$ 벌크비정질 합금의 Nd:YAG 레이저 점용접 특성)

  • Kim, J.H.;Lee, J.H.;Shin, S.Y.;Bae, J.C.;Lee, C.H.
    • Laser Solutions
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    • v.8 no.2
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    • pp.13-20
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    • 2005

  • Weldability is largely dependent on the phase evolution and the microstructure of the weld. For the weldability of the $Cu_{54}Ni_6Zr_{22}Ti_{18}$ bulk metallic glass, the crystallization affects the sensitivity of the weld to the brittle failure. In order to suppress the irreversible crystallization, Nd:YAG laser welding was chosen. The pulsed Nd:YAG laser was irradiated onto the BMG plate and the effects of the pulse shape [peak power intensity and pulse duration time] on the crystallinity were evaluated.

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Laser-assisted Selective Infiltration of tow Melting-point Metal Powders (저융점 금속분말 재료의 레이저 예열 선택적 용침)

  • H. Sohn;Lee, J. H.;J. Suh;D. Y. Yang
    • Laser Solutions
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    • v.7 no.1
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    • pp.37-47
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    • 2004

  • Laser-assisted selective infiltration is a new method of building metal layers to make metal parts layer by layer, in which superheated microscopic metal droplets are infiltrated into a laser-preheated layer of microscopic metal powders. In this work, the selective infiltration of a low melting-point metal, Sn-37Pb wt%, was conducted to investigate the effects of such dominant parameters as superheating temperature, Nd:YAG laser power for preheating, substrate temperature, etc. The optimal conditions for successful selective infiltration of a single layer of microscopic metal powder were experimentally obtained

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Weldability of aluminum alloys by multi-wavelength laser beam (다파장 레이저빔을 이용한 알루미늄 합금의 응접특성)

  • Kim, Jong-Do;Kim, Jeong-Mook
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.5
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    • pp.567-574
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    • 2007

  • Aluminum and aluminum alloys have high rate of lightness, recycling property and excellent specific strength. Fields using them have been widening because they ould satisfy both energy reduction and high efficiency in manufactures production. But they have many problems on welding due to high thermal conductivity and reflectivity, so the study to solve these problems ate proceeding actively around the world. This study was purposed to improve weldability and spread application range for aluminium alloys by using the unique property of aluminium which absorb high energy around $800{\mu}m$ wavelength and the higher temperature, the mote absorbtion of laser beam on preheating by multi-wavelength laser beam(pulsed Nd:YAG laser + diode laser with $808{\mu}m$ wavelength). The favorable mechanical properties were acquired by the test results of strength, hardness and leak of weld metal which had reduced its defect like crack and so on.

  • https://doi.org/10.5916/jkosme.2007.31.5.567 인용 PDF KSCI

CW Laser Generation form Nd;YAG Single Crystal Grown by Czochralski Method (Czochralski 방법으로 육성된 Nd:YAG 단결정으로부터 CW mode laser 의 발진)

  • 이상호;배소익;김한태;정수진
    • Proceedings of the Optical Society of Korea Conference
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    • 1997.08a
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    • pp.85-85
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    • 1997

  • Czochralski 방법에 의해 육성된 Nd:YAG 단결정으로부터 CW mode의 1064nm laser를 발진시켰다. 육성된 단결정은 직경 50mm, 길이 120mm 이었으며, Nd 이온 농도는 O.2~0.9at% 이었다. 육성된 단결정 boule로 부터 결정학적 결함부위인 core 및 facet가 없는 양질의 단결정 부위를 Twyman-Green interferometer로 선빌하였다. 추출핀 부위는 절단, 가공, 연마공정 및 코팅 공정을 통해 직경 6.35mm, 길이 lOOmm의 laser rod를 제작하였다. 절단은 core drill, 또는 원통 연삭기를 사용하여 rod 형태로 가공하였으며, 상$\cdot$하면 polishing은 평행도 10", 직각도 5', 평활도 $\lambda$/10 수준까지 실험실에서 자체 가공하여 일반적인 laser 발진용 rod의 spec.을 만족시킬 수 있었다.

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