• Title/Summary/Keyword: laser transmission 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.

Study on the laser transmission-welding of thermoplastics (열가소성 플라스틱의 레이저 투과 접합에 환한 연구)

  • Seo Myung-hee;Ryu Kwang-hyun;Nam Gi-jung
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9 s.174
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    • pp.34-40
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    • 2005
  • Laser welding of thermoplastics is a new jointing technique with a host of advantages. It is not only another extremely useful welding method but also a cost-effective alternative to traditional techniques involving screws or adhesives. Transmission laser-welding of thermoplastics such as polycarbonate(PC), polypropylene(PP), polyvinyl chloride(PVC), low density polyethylene(LDPE) and acrylic using a high power diode laser has been studied experimentally. The optical transmission of each plastic has been measured at laser wavelength of 808nm. The weld process has been characterized by the specific energy and weld time required for each plastic. The characteristics of laser welding between same plastics have also been analyzed.

Investigation on Nd:YAG Laser Weldability of Zircaloy-4 End Cap Closure for Nuclear Fuel Elements

  • Kim, Soo-Sung;Lee, Chul-Yung;Yang, Myung-Seung
    • Nuclear Engineering and Technology
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    • v.33 no.2
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    • pp.175-183
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    • 2001
  • Various welding processes are now available for end cap closure of nuclear fuel element such as TG(Tungsten Inert Gas) welding, magnetic resistance welding and laser welding. Even though the resistance and TIG welding processes are widely used for manufacturing commercial fuel elements, they can not be recommended for the remote seal welding of a fuel element at a hot cell facility due to the complexity of electrode alignment, difficulity in the replacement of parts in the remote manner and a large heat input for a thin sheath. Therefore, the Nd:YAG laser system using optical fiber transmission was selected for Zircaloy-4 end cap welding inside hot cell. The laser welding apparatus was developed using a pulsed Nd:YAG laser of 500 watt average power with optical fiber transmission. The weldability of laser welding was satisfactory with respect to the microstructures and mechanical properties comparing with TIG and resistance welding. The optimum operation processes of laser welding and the optical fiber transmission system for hot cell operation in a remote manner have been developed The effects of irradiation on the properties of the laser apparatus were also being studied.

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Laser Welding of Thermoplastics Using the Absorbing Materials (열가소성 플라스틱의 흡수체를 이용한 레이저 접합)

  • Seo M.H.;Ryu K.H.;Nam G.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.430-433
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    • 2005
  • Laser bonding between similar and dissimilar thermoplastics has been investigated by making use of laser transmission weld technique. Spot welding of two layers of plastic materials has been demonstrated by using of a high-quality diode-laser with 808nm wavelength. Weld areas increases according to power density, exposure time. The results of peel out test show that peel strengths increase with the area of molten plastics. Layers, which have the same chemical properties, have good bonding qualities. A bonding method which dye film is coated on the interface is used for laser bonding between plastics with high transmission for laser wavelength. Laser transmission bonding is worthy of attention because it is not in contact, requires a few tooling devices, allows a flexible energy delivery and produces nearly invisible welds

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Technology of the End Cap Laser Welding for Irradiation Fuel Rods (조사연료봉 봉단마개의 레이저용접기술)

  • 김수성;이정원;고진현;이영호
    • Journal of Welding and Joining
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    • v.21 no.6
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    • pp.20-25
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    • 2003
  • Various welding methods such as Gas Tungsten Arc Welding(GTAW), magnetic force electrical resistance welding and Laser Beam Welding(LBW) are now available for end cap closure of nuclear fuel rods. Even though the resistance and GTA welding processes are widely used in manufacturing commercial fuel rods, they can not be recommended for the remote seal welding of fuel rods in the hot cell Facility due to the complexity of the electrode alignment, the difficulty in replacing parts in a remote manner and the large heat input for the thin sheath. Therefore, the Nd:YAG laser system using optical fiber transmission was selected for the end cap welding of irradiation fuel rods in the hot cell. The remote laser welding apparatus in the hot cell Facility was developed using a pulsed Nd:YAG laser of 500 watt average power with an optical fiber transmission. The weldment quality such as microstructure and mechanical strength was satisfactory. The optimum conditions of laser welding for encapsulating irradiation fuel rods in the hot cell were obtained.

Modification of Polypropylene for Improving the Laser Transmission Weldability to Polycarbonate (폴리카보네이트와의 레이저 투과 용접성 개선을 위한 폴리프로필렌 개질)

  • Kim, Dae-Jin;Jeon, Il-Ryeon;Park, Hae-Youn;Seo, Kwan-Ho
    • Polymer(Korea)
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    • v.37 no.6
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    • pp.753-763
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    • 2013
  • Laser transmission welding of polymers is now used in a very wide range of industries due to its advantages. If the joining between polypropylene (PP) and polycarbonate (PC) occurs by laser transmission welding, the automotive headlight will get a large profit. However, PP/PC have poor miscibility. In the laser transmission welding results, the adhesion strength between PP and PC was very weak. In this study, PP was modified by grafting of glycidyl methacrylate (GMA). The adhesion strength of PC and PP-g-GMA as a reactive compatibilizer was observed. The adhesion strength was investigated by compatibility with PC, mechanical properties and laser transmission welding.

A study on the Optimum Conditions of Nd:YAG LBW for Zircaloy-4 End Cap Closure By Optical Fiber Transmission (광섬유전송에 의한 Zircaloy-4 봉단마개밀봉의 Nd:YAG LBW의 최적조건에 관한 연구)

  • 김수성;김웅기;이영호
    • Journal of Welding and Joining
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    • v.15 no.6
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    • pp.85-95
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    • 1997
  • This study is to investigate the optimum conditions of Nd:YAG laser beam welding for Zircaloy-4 end cap closure by optical fiber transmission. Laser welding parameters which affect the penetration depth and bead width were experimentally examined using the various beam radius by the beam quality analyzer, joint geometries of end cap and the laser parameters which mean pulse width, repetition rate and pulse energy. Also, an optimum welding speed and the effect of assistant gas with varying the flow rate of He were investigated. We found that the laser average power for the end cap welding will be 230W and rotation speed must not exceed 8 RPM, the best position of focus using optical fiber with 600.mu.m will be 2 to 3mm below the surface of the material.

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A Study on the Mechanical Properties of Joints in Laser Transmission Joining of Polymers (폴리머의 레이저 투과접합 시 접합부의 기계적 성질에 관한 연구)

  • Cha, Sang-Woo;Kim, Jin-Beom;Yoon, Suk-Hwan;Na, Suck-Joo
    • Journal of Welding and Joining
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    • v.25 no.2
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    • pp.43-48
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    • 2007
  • Laser Transmission Joining (LTJ) of plastics is a process in which light of suitable wavelength is transmitted through a transparent substrate that is in contact with an absorbing one. In this paper, LTJ is investigated by preliminary experiments from the viewpoint of mechanical engineering. To understand transmitting characteristics of each polymer substrate, transmission rate, reflection rate and absorption coefficient of polymer are measured by using a laser power-meter. Characteristics of joining in the spot welding and seam welding are investigated by measuring the fracture load. Fracture load increases in accordance to the laser power and irradiation time. However, when the laser power is over 60W and irradiation time over 4seconds, fracture load decreases. This phenomenon is probably due to heat-softening of materials. Besides, cavities are generated at a joint by evaporation of water molecules, which can be suppressed by introduction of a gap between two substrates.

APPLYING LASER-ARC HYBRID WELDING TECHNOLOGY FOR LAND PIPELINES

  • Booth, G-S;Howse, D-S;Woloszyn, A-C;Howard, R-D
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.169-175
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    • 2002
  • World demand for natural gas has generated the need for many new land transmission pipelines to be installed in the next decade or so. Although mechanized gas metal arc welding is well developed, there are opportunities for cost savings by using alternative welding processes. Hybrid Nd:YAG laser - gas metal arc welding enables fibre optic delivery of the laser energy to a robotic welding head to be combined with the addition of extra energy and a consumable to produce good quality, deep penetration welds in a single pass. The present paper describes initial procedure development to optimize the laser and gas metal arc welding parameters for making joints in pipeline steel. Satisfactory joint quality was obtained and it is intended to develop the process to prototype field trials.

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Analysis of Transmission Infrared Laser Bonding for Polymer Micro Devices (폴리머 마이크로 장치에 대한 레이저 투과 마이크로 접합)

  • Kim, Joo-Han;Shin, Ki-Hoon
    • Journal of Welding and Joining
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    • v.23 no.5
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    • pp.55-60
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    • 2005
  • A precise bonding technique, transmission laser bonding using energy transfer, for polymer micro devices is presented. The irradiated IR laser beam passes through the transparent part and absorbed on the opaque part. The absorbed energy is converted into heat and bonding takes place. In order to optimize the bonding quality, the temperature profile on the interface must be obtained. Using optical measurements of the both plates, the absorbed energy can be calculated. At the wavelength of 1100nm $87.5\%$ of incident laser energy was used for bonding process from the calculation. A heat transfer model was applied for obtaining the transient temperature profile. It was found that with the power of 29.5 mW, the interface begins to melt and bond each other in 3 sec and it is in a good agreement with experiment results. The transmission IR laser bonding has a potential in the local precise bonding in MEMS or Lab-on-a-chip applications.