• Title/Summary/Keyword: Laser Welding

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Laser Welding of Automotive Transmission Components (자동차 자동변속기 부품의 레이저 용접 적용)

  • Ahn, Young-Nam;Kim, Cheol-Hee
    • Journal of Welding and Joining
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    • v.29 no.6
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    • pp.45-48
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    • 2011
  • In this research, laser welding of automotive transmission components was investigated to replace electron beam welding which is normally conducted under vacuum condition. Fiber laser welding was applied to the automotive transmission components - hub clutch and annulus gear. In the component welding, the laser welding parameters were optimized to eliminate spatters and the end crater. By applying laser welding to the transmission parts, the process time could be reduced up to 70% compared with the current electron beam welding process.

Improvement of Penetration Characteristics by Plasma Augmented Laser Welding of Small Diameter Stainless Steel Tubes (PALW을 이용한 소경 스테인리스강 튜브의 용입특성 개선)

  • Hwang Jae-Ryeon;Yoon Suk-Hwan;Na Suck-Joo
    • Journal of Welding and Joining
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    • v.22 no.6
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    • pp.30-35
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    • 2004
  • Laser welding is obviously an attractive method to join small, thin parts such as small stainless steel tubes, but it is very sensitive to the joint clearance and tolerance, and this makes laser welding difficult to obtain consistent welding qualities over time. Recently, Plasma Augmented Laser Welding(PALW) is being developed to solve these problems. In this study, plasma arc welding(PAW) was introduced to join conventional V-grooved butt joint of thin stainless steel strips using single laser heat source in manufacturing small stainless steel tubes. The effect of the welding speed enhancement is investigated by the experiments. Effects of welding directions, distance between the heat sources and intensity of arc heat source on the optimal welding speed was investigated. Through this research, it was confirmed that PALW process has higher welding speed and robustness than laser welding process.

Development of the Hybrid Laser Welding Carriage for Shipbuilding (조선 적용을 위한 하이브리드 레이저 용접 캐리지 개발)

  • Shin, J.H.;Lee, Y.S.;Ryu, S.H.;Sung, H.J.
    • Laser Solutions
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    • v.11 no.3
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    • pp.21-24
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    • 2008
  • Hybrid laser welding technology is a good process to reduce a thermal distortion and increase the productivity. However, it requires a high investment and a massive modification of the fabrication line such as a gantry system, milling machine for the edge preparation, high power laser system and weld machine. Therefore the development of an economical laser welding system is a crucial point to apply this system in shipbuilding yard. In this study, a portable hybrid laser welding carriage was developed for I-butt joint without edge milling. It is expected that the carriage type system could reduce investment cost.

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Laser welding technology platform for automotive industry (자동차용 강판의 레이저 용접 플랫폼기술)

  • Kim, Cheol-Hee;Kang, Min-Jung;Ahn, Young-Nam
    • Laser Solutions
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    • v.14 no.1
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    • pp.6-13
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    • 2011
  • Manufacturing technology platform for automotive and mobile industries has been constructed since 2009, for the platform technology project funded by ministry of knowledge and economics. Technology platform in laser welding has also been developed for automotive steel sheets with a strength up to 1GPa. Laser welding technology platform will provide welding characteristics for various laser sources, steel plates and welding conditions. This article shortly explains outline of laser welding technology platform and partially introduces the developed laser welding data base.

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DEVELOPMENT OF DIGITAL LASER WELDING SYSTEM FOR AUTOMOBILE SIDE PANELS

  • Park, H.S.;Lee, G.B.
    • International Journal of Automotive Technology
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    • v.8 no.1
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    • pp.83-91
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    • 2007
  • Nowadays, the increasing global competition forces manufacturing enterprises to apply new technologies such as laser welding to manufacturing of their products. In case of automotive industries, they interest in assembly system for BIW (Body in White) carrying out laser welding. In this paper, the method of implementation for digital laser welding assembly system is proposed. Based on the requirements of assembly tasks obtained through product analysis, process modeling is executed by using the IDEF0 and UML model. For digital assembly system, the selected components are modeled by using 3D CAD tools. According to the system configuration strategy, lots of the alternative solutions for the assembly system of welding side panels are generated. Finally, the optimal laser welding system is chosen by the evaluation of the alternative solutions with TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method.

Microstructure Evolution of UFG Steel Weld by Hybrid and Laser Welding (하이브리드 용접과 레이저 용접에 의한 세립강 용접부의 미세조직변화에 관한 연구)

  • Dong, H.W.;Lee, M.Y.;Ahn, Y.S.
    • Journal of Power System Engineering
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    • v.14 no.3
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    • pp.58-63
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    • 2010
  • A laser beam welding and an electric arc welding were combined, and the positive points of each welding method are drawn such as high speed, low thermal load, deep penetration, and high productivity. The fiber laser-MIG conjugated welding. namely the hybrid welding has been studied mainly for the automation industry of a pipeline welding. In this study, the MIG welding was combined with a fiber laser welding to make up the hybrid welding. The weld shapes, microstructures and mechanical properties for weld zones after the hybrid welding or only fiber laser welding were investigated on the 700 MPa grade Ultra Fine Grained(UFG) high strength steel. The amount of acicular ferrite in weld metals and HAZ(heat affected zone) was observed larger after hybrid welding compared with after only laser welding. The Vickers hardness of the top area of the fusion zone after fiber laser welding was higher compared with after hybrid welding.

A comparative study on the tensile bonding strength of gold alloy solder joints by dental soldering method (치과용 납착 방법에 따른 금합금 납착 연결부의 인장 결합강도 비교 연구)

  • Cho, Mi-Hyang;Lee, Myung-Kon
    • Journal of Technologic Dentistry
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    • v.30 no.1
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    • pp.49-55
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    • 2008
  • In this study, to provide the fundamental data on stable connection method for successful implants prosthesis, We fabricated the solder joint of gold alloy bar specimens by gas flame soldering method and laser welding and soldering method. It compared and studied the tensile strength of two soldering method by universal testing machine. The results using universal testing machine were as follow : The mean of tensile strength of solder joint bar in gas flame soldering method specimens was 363.89 $\pm$17.62 MPa, and the mean strength of laser welding and soldering method was 125.91 $\pm$ 19.66 MPa, so gas flame soldering method was better than laser welding and soldering method and the finding better way to improve tensile strength is needed in laser welding method. On weak loading condition and the part which is needed an accuracy, laser welding method is more effective and on long-span prosthesis and frequent chewing loading part, laser welding technique is recommended first and applying additional gas flame soldering technique would be better for making much more successful prosthesis.

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Nd:YAG 레이저를 통한 SIDE PANEL의 3겹 겹치기 레이저 용접

  • 장인성;서보신;권태용
    • Proceedings of the Korean Society of Laser Processing Conference
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    • pp.55-60
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    • 2000
  • Laser welding is an important technology in the assembly of automotive. In this paper, Nd:YAG laser welding of applications for auto body assembly will be introduced. This paper will describe characteristics of the CW Nd:YAG laser lap-joint welding, and laser welding of specific configurations for a Zinc-coated steel. Experimental results indicated that the weld quality of auto body assembly using the CW Nd:YAG laser welding technology.

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Residual Stress Distribution of the Laser Welded Automotive Steel Sheets (레이져 용접된 자동차용 판재의 잔류응력분포)

  • 윤선진;김재도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.163-168
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    • 1994
  • Zinc coated steel sheets have been widely used in automotive industry. High power laser welding has been used as an excellent welding means for thin sheets. The welding residual stress, which was brought in laser welding, causes making weak the mechanical strength. The purpose of this study is to get the residual stress distribution in various laser welding condition by FEM and verify the results by X-Ray diffraction. Welding residual stresses have been calculated by thermal elasto-plastic analysis using finite element method. Form the results, it can be known that the laser welding condition affects to distribution of the residual stress.

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Development of remote welding system using fiber laser (화이버 레이저 원격용접 기술개발)

  • Kim K. S.;Jung C. H.;Kim I. H.;Chang I. S.;Lee H. B,
    • Laser Solutions
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    • v.8 no.3
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    • pp.27-30
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    • 2005
  • Nowadays, most automotives companies are making use of laser welding in car body assembly shop. But even though laser welding is better than resistance spot welding in many points, its application has been limited to special technology for manufacturing. The paper introduces in the field of remote welding system (RWS) to improve the process efficiency of laser welding. Positioning time of RWS between welding stitches is dramatically reduced to zero. It is a kind of solutions to generalize laser welding in mass production. This RWS consists of fiber laser, industrial robot and 3-axis scanner.

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