• PICALO 2008 Paper #507 (Microstructural Evolution of a Graded Nickel-Titanium Alloy in Laser Solid Forming)

    Microstructural Evolution of a Graded Nickel-Titanium Alloy in Laser Solid Forming
    Authors:
    Xiaojing Xu, Northwest Polytechnical University; Xi'an AZ Peoples Republic of China
    Presented at PICALO 2008

    Laser Solid Forming (LSF) has been considered as a significant and promising technology to fabricate functionally graded materials. A rapidly solidified binary Nickel-Titanium graded material was fabricated by a CO2 laser solid forming equipment, using argon as the protecting gas. The compositional gradient in the graded alloy was changed from pure Ni to Ni-35at.%Ti in a thin-wall sample with the height of 24 mm. The results of SEM and EDS analysis showed that a series of phase evolutions, γ dend...

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  • PICALO 2008 Paper #509 (Influence of Laser Dmd Technics on Microstructure of Inconel 718 High-Temperature Alloy)

    Influence of Laser Dmd Technics on Microstructure of Inconel 718 High-Temperature Alloy
    Authors:
    Jianhua Yao, Zhejiang University of Technology; Hangzhou Peoples Republic of China
    Jyoti Mazumder, University of Michigan; Ann Arbor MI USA
    Presented at PICALO 2008

    Direct Metal Deposition (DMD), combined with CAD/CAM technology, material powder metallurgy technology, optics technology, is an effective method of rapid manufacturing, which can be used to control the properties of metalwork by controlling the microstructure of metal deposition layer. As a high-temperature nickel-base alloy containing high Nb, Inconel 718 is widely applied in the key parts of aerospace engines in virtue o...

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  • PICALO 2008 Paper #511 (New Development of Far Distance Coaxial Powder Feeding System)

    New Development of Far Distance Coaxial Powder Feeding System
    Authors:
    Xichen Xichen, Laser Processing Center,Tianjin Polytechnic University; Tianjin AB Peoples Republic of China
    Liwei Feng, Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Zhen Cao, Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Nan Yang, Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Presented at PICALO 2008

    Coaxial laser cladding has been widely used to 3D components direct manufacturing and repairing expensive parts. A new far distance coaxial powder feeding system has been developed. It consists of a mult dipper powder feeder,four ...

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  • PICALO 2008 Paper #601 (Fibre Laser Welding of Ti6Al4V)

    Fibre Laser Welding of Ti6Al4V
    Authors:
    Jongkol Iammi, The University of Nottingham; Nottingham Great Britain
    Janet Folkes, The University of Nottingham; Nottingham Great Britain
    Guijun Bi, The University of Nottingham; Nottingham Great Britain
    Ian Pashby, The University of Nottingham; Nottingham Great Britain
    Presented at PICALO 2008

    Ti6Al4V is widely used in the aerospace industry due to its lightweight and high strength properties. Joining titanium is of prime importance and while other welding techniques have been documented, the use of a fibre laser to weld this material has not been extensively investigated. In this paper, autogenously butt weld joi...

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  • PICALO 2008 Paper #602 (Dissimilar Metal Welding Titanium and Steel Sheet by Fiber Laser)

    Dissimilar Metal Welding Titanium and Steel Sheet by Fiber Laser
    Authors:
    Jong-Do Kim, Department of Marine System Engineering, Korea Maritime University; Busan South Korea
    Seo-Jeong Park, Research Institute of Industrial Science & Technology; Pohang, Kyungbuk South Korea
    Woong-Seong Chang, Research Institute of Industrial Science & Technology; Pohang South Korea
    Presented at PICALO 2008

    Recently, the development of laser welding with dissimilar metal is demanded in the automobile, aerospace, and sea-water plant industry. Titanium alloy has been increasing to use for important mechanical parts. In this study, the lap and butt joint welding were performed with dissimila...

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  • PICALO 2008 Paper #603 (A Comparative Study of Single Mode Fibre Laser and Nd:YAG Laser Welding of Ti-6Al-4V)

    A Comparative Study of Single Mode Fibre Laser and Nd:YAG Laser Welding of Ti-6Al-4V
    Authors:
    Hui-Chi Chen, The University of Manchester; Manchester Great Britain
    Andrew Pinkerton, The University of Manchester; Manchester Great Britain
    Jonathan Blackburn, Twi Ltd; Cambridge Great Britain
    Lin Li, The University of Manchester; Manchester Great Britain
    Paul Hilton, Twi Ltd; Cambridge Great Britain
    Presented at PICALO 2008

    In the past ten years, fibre laser systems have been developed intensively and can now be obtained commercially for industrial use. The fibre laser has been recognised as one of the laser types with most potential for the future...

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  • PICALO 2008 Paper #604 (Studies on the Laser Spot Welding of Magnet/Steel Dissimilar Materials)

    Studies on the Laser Spot Welding of Magnet/Steel Dissimilar Materials
    Authors:
    Baohua Chang, Tsinghua University; Beijing Peoples Republic of China
    Shaojun Bai, Tsinghua University; Beijing Peoples Republic of China
    Xiaogong Li, University of Waterloo; Ontario Canada
    Yuquan Ding, University of Waterloo; Ontario Canada
    Hua Zhang, Tsinghua University; Beijing Peoples Republic of China
    Dong Du, Tsinghua University; Beijing Peoples Republic of China
    Yunhong Zhou, University of Waterloo; Ontario Canada
    Presented at PICALO 2008

    Laser spot welding of high performance sintered NdFeB magnets of grade N48 and SPCC cold rolled ...

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  • PICALO 2008 Paper #605 (Characteristic Melt Pool Hydrodynamic Behaviors for CW Nd-YAG Deep Penetration Laser Welding)

    Characteristic Melt Pool Hydrodynamic Behaviors for CW Nd-YAG Deep Penetration Laser Welding
    Authors:
    Remy Fabbro, LALP (CNRS)/GIP GERAILP; Arcueil Cedex France
    Sonia Slimani, ; Cedex France
    Frederic Coste, ; Cedex France
    Francis Briand, ; Cedex France
    Presented at PICALO 2008

    The hydrodynamics evolution of the melt pool during laser Yag welding of stainless steel has been experimentally studied by using a high-speed video camera that allowed us to analyze the main characteristic parts of such melt pools. Depending on operating conditions, very different and complex hydrodynamic behaviors can be observed when the welding speed varies from typically a ...

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  • PICALO 2008 Paper #606 (Gas Jet Effect on the Molten Bath Movements Produced during Deep Penetration Laser Welding)

    Gas Jet Effect on the Molten Bath Movements Produced during Deep Penetration Laser Welding
    Authors:
    El-Hachemi Amara, Advanced Technologies Development Centre (CDTA); Algiers Algeria
    Remy Fabbro, LALP(CNRS)-GIP GERAILP; Arcueil Cedex France
    Presented at PICALO 2008

    Practically, the melted bath movements induced during deep penetration laser welding can be controlled by external effects that can lead to make the flow more uniform. A technique consisting in directing an inert gas jet towards the keyhole aperture under a given angle and height of the gas delivering nozzle is used, and a laminar flow is observed. Consequently, the formation of porosities can be thus reduced, and the ob...

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  • PICALO 2008 Paper #607 (Effect of Zinc Coating Thickness in Gap-Free Laser Welding of Galvanized Sheet Steels )

    Effect of Zinc Coating Thickness in Gap-Free Laser Welding of Galvanized Sheet Steels
    Authors:
    Ian M Richardson, Delft University of Technology; Delft Netherlands
    Yu Pan, Netherlands Institute for Metals Research; Delft Netherlands
    Presented at PICALO 2008

    Laser beam welding has been used for joining zinc coated steel in the automotive industry. However, overlap laser welding of these steels is considered to be difficult because of the low boiling temperature of the zinc compared with the melting temperature of the steel. To date welding is normally undertaken when a gap is present between the plates, introduced prior to welding, or when welding with a modified laser beam configu...

    $28.00

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