• ICALEO 2009 Paper #1404 (Thermodynamic Evaluation of Inert-gas Laser Beam Fusion Cutting with CO2, Disk and Fiber Lasers)

    Thermodynamic Evaluation of Inert-gas Laser Beam Fusion Cutting with CO2, Disk and Fiber Lasers
    Authors:
    Achim Mahrle, TU Dresden; Dresden Germany
    Eckhard Beyer, Fraunhofer Iws; Dresden Germany
    Presented at ICALEO 2009

    Inert-gas laser beam fusion cutting is an established thermal cutting technology for stainless and other high-alloyed steels. At the present time, CO2 lasers are particularly applied for corresponding cutting applications but the nowadays available solid-state disk and fiber lasers seems to be an attractive alternative as efficient cutting heat sources due to their advantages in power efficiency, beam guidance and beam quality. It is consequently anticipated that dis...

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  • ICALEO 2009 Paper #1403 (Numerical Calculation of Laser Beam Path Influenced by High Temperature Gas Above Specimen during Laser Welding)

    Numerical Calculation of Laser Beam Path Influenced by High Temperature Gas Above Specimen during Laser Welding
    Authors:
    Masami Mizutani, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
    Seiji Katayama, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
    Presented at ICALEO 2009

    It has been generally accepted that the laser beams of about 1 to 1.1 mm in wavelength, such as fiber, disk and YAG lasers have smaller interaction to the media such as plume and plasma between the optics system and the specimen than CO2 laser beam of 10.6 mm. However, we have recently found that weld bead formation is greatly affected by the state o...

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  • ICALEO 2009 Paper #1402 (Modelling and Validation of a Direct Metal Deposition Nozzle)

    Modelling and Validation of a Direct Metal Deposition Nozzle
    Authors:
    Weijing He, Twi Ltd; Cambridge Great Britain
    Lijuan Zhang, Twi Ltd; Cambridge Great Britain
    Paul Hilton, Twi Ltd.; Great Abington, Cambridge Great Britain
    Presented at ICALEO 2009

    Laser direct metal deposition (LDMD) will only achieve its full potential as an additive manufacturing process when a connection between the process parameters used, the microstructure created and the properties of a particular metal deposit can be established. This paper addresses the development of a numerical model, using computational fluid dynamics software, to describe an existing LDMD nozzle, in terms of the interact...

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  • ICALEO 2009 Paper #1401 (Temperature Field Simulation of Functional Ceramics during CO2 Laser Sintering)

    Temperature Field Simulation of Functional Ceramics during CO2 Laser Sintering
    Authors:
    Xinyu Du, Beijing University of Technology; Beijing Peoples Republic of China
    Lingfel Ji, -; -
    Yijian Jiang, -; -
    Presented at ICALEO 2009

    The functional ceramics of Ta2O5, Ba0.5Sr1.5Na0.6K0.4Nb5O15 (BSKNN) and Sr1.86Ca0.14NaNb5O15 (SCNN) have been prepared successfully by CO2 laser sintering. The physical properties of these laser sintered ceramics are improved comparing to the traditional furnace sintered ceramics. In the present work, a finite-element model is developed to explore the process of laser sintering and the mechanism of property improvement by analyzing the temper...

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  • ICALEO 2009 Paper #1305 (Direct Laser Deposition Within Post Process Machining Characterization)

    Direct Laser Deposition Within Post Process Machining Characterization
    Authors:
    Konrad Bartkowiak, Fraunhofer IWS; Dresden Germany
    Pawel Twardowski, Poznan Univ. of Technology; Poznan Poland
    Paul Denney, Presenter not author - CCAT; - USA
    Presented at ICALEO 2009

    Industry applications of Direct Laser Deposition (DLD) technique grows from year to year. However, progress is limited by 1-step applications area, because most of the deposited layer still requires a post machining process (2-step). Machining can be done at the same laser workstation to save machining time. However, the laser optics are very sensitive to dust, moisture and thermal shock, therefore dry machini...

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  • ICALEO 2009 Paper #1304 (The Significance of Melt Pool Variables in Laser Direct Deposition of Functionally Graded Aerospace Alloys)

    The Significance of Melt Pool Variables in Laser Direct Deposition of Functionally Graded Aerospace Alloys
    Authors:
    Kamran Shah, The University of Manchester; Manchester Great Britain
    Ahmad Salman, -; -
    Andrew Pinkerton, The University of Manchester; Manchester Great Britain
    Lin Li, The University of Manchester; Manchester Great Britain
    Presented at ICALEO 2009

    Laser Direct Metal Deposition (LDMD) has developed for diverse applications, from high precision manufacturing to repair. Although functional grading of surface coatings is well established, research into larger scale, intermetallic grading as an alternative to welding is ongoing. This paper consid...

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  • ICALEO 2009 Paper #1303 (The Exploration on Laser Vertical Sintering with Magnetic Field)

    The Exploration on Laser Vertical Sintering with Magnetic Field
    Authors:
    Xiaogang Li, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
    Jimin Chen, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
    Furong Liu, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
    Penfei Lv, National Center of Laser Technology, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    Selective Laser Sintering (SLS) is a fast developing technology of Rapid Manufacturing (RM). In so...

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  • ICALEO 2009 Paper #1302 (Applied Spectroscopy In Situ during Direct Laser Deposition Process)

    Applied Spectroscopy In Situ during Direct Laser Deposition Process
    Authors:
    Konrad Bartkowiak, Fraunhofer IWS; Dresden Germany
    Paul Denney, Presenter not author - CCAT; - USA
    Presented at ICALEO 2009

    The Direct Laser Deposition (DLD) method is becoming more popular and has recently been successfully applied in commercial workshops. It is mainly used for reconditioning of worn and damages parts and eliminating them from scrap. However, DLD technique shows great potential for direct manufacture, where high accuracy, low distortion and small HAZ effects are required. Especially the high accuracy makes a challenge for DLD process control, which is permanently developing and updated fr...

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  • ICALEO 2009 Paper #1301 (On the Temperature Distributions and Thermal Stresses Induced in Laser Solid Freeform Fabrication of Multi-material Structures)

    On the Temperature Distributions and Thermal Stresses Induced in Laser Solid Freeform Fabrication of Multi-material Structures
    Authors:
    Masoud Alimardani, University of Waterloo; Waterloo ON Canada
    Mehrdad Iravani Tabrizipour, University of Waterloo; Waterloo ON Canada
    Ehsan Toyserkani, University of Waterloo; Waterloo ON Canada
    Jan P. Huissoon, University of Waterloo; Waterloo ON Canada
    Presented at ICALEO 2009

    Multi-material structures have shown a wide range of applications in various advanced technologies in which diverse material properties are required in order to enhance the structural properties and functionalities. Laser solid freeform fabrication...

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  • ICALEO 2009 Paper #1205 (Direct Metal Deposition Melt Pool Temperature Distribution Control Through Novel Holographic Beam Shaping, Allowing Improved Mechanical and Corrosion Properties)

    Direct Metal Deposition Melt Pool Temperature Distribution Control Through Novel Holographic Beam Shaping, Allowing Improved Mechanical and Corrosion Properties
    Authors:
    Matthew Gibson, Loughborough University; Loughborough Great Britain
    John Tyrer, Loughborough University; Loughborough Great Britain
    Rebecca Higginson, Loughbrough University; Loughborugh Great Britain
    Presented at ICALEO 2009

    The use of a laser beam to fuse a metal addition to the surface of a component for repair or direct manufacture has been adopted my many industries. However there are still issues to be overcome. Due to the high temperatures involved in the process and the complex materials utilis...

    $28.00

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