• 제목/요약/키워드: Continuous Wave Nd:YAG Laser

검색결과 55건 처리시간 0.042초

SM45C와 SUS304의 Nd:YAG 레이저 맞대기용접특성 (ButWelding Characteristics of SM45C and SUS 304 using a Nd:YAG laser)

  • 유영태;노경보;신호준;김지환;오용석
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2003년도 춘계학술대회
    • /
    • pp.1302-1308
    • /
    • 2003
  • Welding characteristics of austienite 304 stainless steel and SM45C using a continuous wave Nd:YAG laser are experimentally investigated. Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and deep penetration. This paper describes the weld ability of SM45C carbon steel and austienite 304 stainless steel for machine structural use by Nd:YAG laser.

  • PDF

연속 발진 다이오드 레이저로 여기된 수동형 Q-스위치 Nd:YVO4 레이저의 출력 펄스 안정화 (Stabilization of Output Pulses from a Passively Q-switched Nd:YVO4 Laser Pumped by a Continuous-wave Laser Diode)

  • 안승인;박윤배;여환섭;이준호;이강인;이종훈
    • 한국광학회지
    • /
    • 제20권5호
    • /
    • pp.276-280
    • /
    • 2009
  • Cr:YAG 결정을 포화흡수체로 사용하여 수동형 Q-스위치시킨 다이오드 레이저 여기 Nd:$YVO_4$ 레이저를 제작하였다. Cr:YAG 결정의 한 면에 여기 빛 파장(808 nm)에 대해 고반사 코팅을 한 후, Nd:$YVO_4$ 결정과 접촉시켜 공진기를 구성하였다. Cr:YAG의 한 면에 여기 다이오드 레이저를 반사시키는 코팅을 입혀 공진기의 광변환 효율을 높임과 동시에, 여기빔에 의한 포화흡수체의 표백현상을 방지하여 안정된 출력이 나오게 하였다. 레이저 이득 매질 및 포화흡수체의 온도는 열전 냉각기와 냉각수를 사용하여 안정화 시켰다. 온도안정화를 시킨 상태에서 발진되는 펄스의 첨두 출력 요동(peak to peak)은 4%였다. 다이오드 레이저의 출력이 1 W일 때, 출력 펄스의 반복률은 평균 9 KHz 였으며, 최소 펄스폭은 7.11 ns, 최고 출력은 16.27 mW였다.

연속파형 Nd:YAG레이저를 이용한 Inconel 600와 STS 304의 이종금속용접 (Dissimilar Metal Welding of Inconel 600 and STS304 by a continuous wave Nd:YAG Laser)

  • 신호준;유영태;송성욱
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2004년도 춘계학술대회
    • /
    • pp.1120-1125
    • /
    • 2004
  • Welding characteristics of STS304 stainless steel and Inconel 600 using a continuous wave Nd:YAG laser are experimentally investigated. Alloy 600 being used in steam generator tubing of pressurized water reactor(PWR) exposed to some corrosion environment, stress corrosion cracking can occur on this material. Presented here are the results from a series of experiments in which dissimilar metal welds were made using the gas tungsten arc welding process with pure argon shielding gas. But It is well known that solidification cracking susceptibility of austenitic alloys depends on the solidification temperature range and amount/distribution of solute rich liquid that exists at the terminal stages of solidification. An experimental study was conducted to determine effects of welding parameters and to optimize those parameters that have the most influence on eliminating or reducing the extent welding zone formation at dissimilar metal welds.

  • PDF

Nd:YAG 레이저를 이용한 자동차 배터리용 SS41 다층박판 이종두께 T형상 용접 특성 (T-joint Welding Characteristics of Multi-thin Plate Dissimilar Thickness of SS41 of Automobile Battery by using Nd:YAG Laser)

  • 양윤석;황찬연;유영태
    • 한국정밀공학회지
    • /
    • 제29권10호
    • /
    • pp.1078-1088
    • /
    • 2012
  • In this paper, we present research experimental results about the different thickness T-joint welding of the high power continuous wave(CW) Nd:YAG laser for the secondary battery of a vehicle. Although the conventional method used for the secondary battery is a argon TIG welding, we utilize a laser welding to improve Tungsten Inert Gas(TIG) welding's weakness. The laser, which has a couple of advantage such as aspect ratio, low Heat Affected Zone(HAZ), good welding quality and fast productivity utilized in this work is a CW Nd:YAG laser. In order to observe laser welding sections, we used a optical microscope. Through the analysis of the metallographic, hardness, aspect ratio, and heat input, we obtained the desired data in condition of 1800 W laser beam power and 1.8 m/min and 2.0 m/min laser beam travel speeds. In order to compare electric resistances of the argon TIG welding and laser welding, we made an actual battery and the electric resistance of the laser welding is reduced by 40~45% comparing with the argon TIG welding.

CW Nd:YAG 레이저를 이용한 SM45C와 STS304의 이종금속용접 (Dissimilar Metal Welding of SM45C and STS304 by means of CW Nd:YAG Laser)

  • 신호준;유영태;임기건;안동규
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2004년도 추계학술대회 논문집
    • /
    • pp.1369-1375
    • /
    • 2004
  • For many years and primarily for economical reasons, Dissimilar Metal Welds have been used as transition joints in a variety of equipment and applications. But Dissimilar Metal Welds have several fabrication and metallurgical drawbacks that can often lead to in-service failures. For example, the most pronounced fabrication faults are hot cracks. Laser welding techniques have been characterised for various materials. In this paper, the laser weldability of STS304 stainless steel and SM45C at dissimilar metal welds using a continuous wave Nd:YAG laser are experimentally investigated. An experimental study was conducted to determine effects of welding parameters, on eliminating or reducing the extent welding zone formation at dissimilar metal welds and to optimize those parameters that have the most influence parameters such as focus length, power, beam speed, shielding gas, and wave length of laser were tested

  • PDF

고출력 연속파형 Nd:YAG 레이저를 이용한 CSP 1N 냉연강판 절단시 절단공정변수의 절단폭에 미치는 영향 (Influence of process parameters on the kerfwidth for the case of laser cutting of CSP 1N sheet using high power CW Nd:YAG laser)

  • 안동규;김민수;이상훈;박형준;유영태
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2004년도 추계학술대회
    • /
    • pp.910-915
    • /
    • 2004
  • The objective of this study is to investigate the influence of process parameters, such as power of laser, travel speed of laser and material thickness, on the practical cutting region and the kerfwidth for the case of cutting of CSP 1N sheet using high power Nd:YAG laser with continuous wave(CW). In order to find the practical cutting region and the relationship between process parameters on the kerfwidth, several laser cutting experiments are carried out. The effective heat input is introduced to consider the influence of power and travel speed of laser on the kerfwidth together. From the results of experiments, the allowable cutting region and the relationship between the effective heat input and kerfwidth for the case of cutting of CSP 1N sheet using high power CW Nd:YAG laser have been obtained to improve the dimensional accuracy of the cut area.

  • PDF

연속파형 Nd:YAG 레이저를 이용한 SM45C 맞대기 용접의 공정 변수 (Process Parameters of Butt Welding of SM45C using a Continuous Wave Nd:YAG Laser Beam)

  • 유영태;노경보;오용석;김종신;임기건
    • 한국정밀공학회지
    • /
    • 제20권7호
    • /
    • pp.44-55
    • /
    • 2003
  • 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.

고출력 연속파형 Nd:YAG 레이저를 이용한 CSP 1N 냉연강판 절단시 공정변수의 절단폭에 미치는 영향 (Influence of process parameters on the kerfwidth for the case of laser cutting of CPS 1N sheet using high power CW Nd:YAG laser)

  • 김민수;이상훈;박형준;유영태;안동규
    • 한국정밀공학회지
    • /
    • 제22권7호
    • /
    • pp.19-26
    • /
    • 2005
  • The objective of this study is to investigate the influence of process parameters, such as power of laser, cutting speed of laser and material thickness, on the practical cutting region and the kerfwidth fer the case of cutting of CSP IN sheet using high power Nd:YAC laser in continuous wave(CW) mode. In order to obtain the practical cutting region and the relationship between process parameters on the kerfwidth, several laser cutting experiments are carried out. The effective heat input is introduced to consider the influence of power and cutting speed of laser on the kerfwidth together. From the results of experiments, the allowable cutting region and the relationship between the effective heat input and kerfwidth fur the case of cutting of CSP 1N sheet using high power CW Nd:YAG laser have been obtained to improve the dimensionalaccuracyofthecutarea.

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

  • 신호준;유영태;안동규;신병헌
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2005년도 추계학술대회 논문집
    • /
    • pp.176-183
    • /
    • 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.

  • PDF