• Title/Summary/Keyword: Nd : YAG 레이저

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The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [ I ] - The Effect of Processing Parameter on Weldability of Laser - (펄스 Nd:YAG 레이저를 이용한 모터용 스테이터 적층코어의 용접특성 [ I ] - 레이저 용접성에 미치는 가공변수의 영향 -)

  • Kim Jong-Do;Yoo Seung-Jo;Kim Jang-Soo
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.5
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    • pp.629-635
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    • 2006

  • Manufacture of motor by laser has been studying realization that was demands on market for lightening and miniaturization. Moreover. early in the 1980s. manufacture of parts for automobiles by laser welding was already successfully introduced. The purpose of this study was to develop production technology of the high quality laminated stator core for motor by pulsed Nd:YAG laser heat source. In the event of adjusting defocus and voltage to control humping in laser welding of the laminated core. sound bead could be obtained. but deep penetration was not. Therefore. explosive evaporating plasma was controlled by adjustment of peak power on pulse width. Particularly, because explosive evaporating plasma induced high peak power, made molten metal in keyhole scatter. a suitable adjustment of peak power was required to obtain sound bead. As a results of experiment. sound bead and deep penetration could be obtained.

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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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Present situations and applications of industrial lasers in terms of Nd:YAG laser (Nd:YAG레이저를 중심으로 한 산업용 레이저의 현황과 활용)

  • 김정묵
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.07a
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    • pp.2-3
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    • 2003

  • 오늘날 레이저는 수많은 종류가 등장하였으며 출력개선은 물론 장치의 규모도 나날이 Compact하게 발전하였다. 또한 그 활용성도 대단히 증가하여 의료, 과학, 군사분야를 시작으로 1990년에 이르면서 산업 전 분야에 파급되어 원자력, 전기／전자, 자동차, 반도체 등 주요산업의 제품수준을 향상시키는 핵심기술로 이용되고 있다. 레이저는 이와 같이 새로운 생산도구로서 위치를 확립 시키면서 산업분야의 다양성과 함께 가공산업에서 요구되는 레이저 관련 기술도 다양하게 진보하고 있는 추세이다. (중략)

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Histologic changes of pulpal tissue after laser-aided ceramic bracket debonding (레이저를 이용한 도재 브라켓 제거 술식 후 치수의 조직학적 변화)

  • Kim, Yu-Jeong;Lim, Sung-Hoon;Yoon, Young-Joo;Park, Joo-Cheol;Kim, Kwang-Won
    • The korean journal of orthodontics
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    • v.34 no.4 s.105
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    • pp.343-349
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    • 2004

  • Laser-aided debonding has advantages in that the heat produced is localized and controlled, the debonding tool is not heated, and it can be used for the removal of various types of ceramic brackets, regardless of their design. However, the range of safe power usage for laser-aided debonding has not vet been confirmed. The Purpose of this study was to evaluate the histologic changes of pulpal tissue in a rabbit's incisor after Nd-YAG laser-aided ceramic bracket debonding at different levels of power. The result were as follows: 1. At 3-5W Nd-YAG laser power level and 3 seconds of exposure time, the ceramic bracket debonding procedure was not easy. At 5W of power a tie-wing fracture occurred on one bracket during debonding using Weingart plier. The histologic section of pulp represented no adverse changes. 2. At 7-13 W power level and less than 5 seconds of exposure time, the debracketing procedure was done easily and bracket facture did not occur. The histologic section of pulp represented mild and reversible changes. All the results were reversible and no pulpal degeneration or necrosis occurred. Considering the results, it appears that the laser-aided debonding technique is a safe method that does not result in irreversible pulpal changes, softens bracket bonding resin within a saie range of power and exposure time, and is useful for ceramic bracket recycling by lowering the tie- wing fracture rate.

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A Study on the Butt Welding of Zircaloyf Sheets Using Nd:YAG Laser (Nd-YAG 레이저를 이용한 Zircaloy-4 판재의 맞대기 용접에 관한 연구)

  • 황용화;고진현
    • Proceedings of the KWS Conference
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    • 2000.04a
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    • pp.139-143
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    • 2000

  • Laser beam weldability of Zircaloy-4 was investigated using a pulsed Nd:YAG laser of 550W average power. Mechanical properties and microstructure of laser butt welded Zircaloy-4 test specimens were examined. The influence of laser generated during laser welding was analyzed and optimum laser welding parameters were investigated.

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