• ICALEO 2007 Paper #1204 (Enhanced Laser Percussion Drilling Modeling Utility)

    Enhanced Laser Percussion Drilling Modeling Utility
    Authors:
    Devdas Shetty, University of Hartford; West Hartford CT USA
    Ivana M. Milanovic, University of Hartford; West Hartford CT USA
    Tom A. Eppes, University of Hartford; West Hartford CT USA
    J. Bornas, University of Hartford; West Hartford CT USA
    Presented at ICALEO 2007

    The supply chain within the aerospace industry is in the midst of a significant transformation. In decades past, components and assemblies were produced by a few highly vertically integrated companies. Today, the supply chain is disaggregated as components and assemblies are sourced on a global scale from an increasing number of special...

    $28.00

  • ICALEO 2007 Paper #1205 (Influence of Incident Angle on Laser Drilling)

    Influence of Incident Angle on Laser Drilling
    Authors:
    Schneider Matthieu, LALP; arcueil France
    Laurent Berthe, LALP; ARCUEIL France
    Maryse Muller, LALP; ARCUEIL France
    Remy Fabbro, LALP; ARCUEIL France
    Presented at ICALEO 2007

    Laser drilling is able to use as an industrial process for several tens years. However, inherent factors due to laser source, material properties and dynamic of the process are still making physical understanding very difficult. Moreover mistake on measurements can be made with the established diagnostics, especially for deep holes. This paper deals with the study of holes properties drilled by laser with the HL201P from TRUMPF. It ...

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  • ICALEO 2007 Paper #1206 (New Applications with High Average Power Q-switched Nd:YAG Lasers)

    New Applications with High Average Power Q-switched Nd:YAG Lasers
    Authors:
    Wolfram Rath, Rofin Sinar Laser GmbH; Hamburg Germany
    Markus Rütering, Rofin Sinar Laser GmbH; Hamburg Germany
    Presented at ICALEO 2007

    For many years applications of Q-switched lasers are widely in use like marking, engraving, material removal, drilling cutting etc. The realization of large area processing, however, like cleaning, coating removal and surface modifications is limited for two reasons: First because of the relative low average power of the lasers available so far which can not realize the required processing rates and second because of the limited pulse energy of the available laser sources t...

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  • ICALEO 2007 Paper #1301 (Simulation of Thermal Stress in Induction-assisted Laser Cladding)

    Simulation of Thermal Stress in Induction-assisted Laser Cladding
    Authors:
    Dietrich Lepski, Fraunhofer IWS Dresden; Dresden Germany
    Frank Brückner, Fraunhofer IWS Dresden; Dresden Germany
    Eckhard Beyer, Fraunhofer IWS Dresden; TU Dresden LOT / IOF; Dresden Germany
    Presented at ICALEO 2007

    In laser cladding powder particles of wear and corrosion resistant materials are deposited on the workpiece and melted by the laser beam to get a strong weld joint. High temperature gradients and density changes due to phase transformations arising during cooling are responsible for the evolution of thermal stresses, which even may cause cracks and delamination. This effect becomes m...

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  • ICALEO 2007 Paper #1304 (Investigation of Meltpool Characteristics and Correlations during Laser Cladding using a Finite Element Modeling Approach)

    Investigation of Meltpool Characteristics and Correlations during Laser Cladding using a Finite Element Modeling Approach
    Authors:
    Johannes Hofman, Netherlands Institute for Metals Research; Enschede Netherlands
    D.F. De Lange, University of Twente; Enschede Netherlands
    J. Meijer, University of Twente; Enschede Netherlands
    Presented at ICALEO 2007

    An important goal in the optimization of the laser cladding process is to reduce the degree of dilution. This dilution depends on process settings like scanning speed, laser power and powder mass rate. To optimize process settings width respect to the dilution, usually an expensive series of experiments is performed. Optimal p...

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  • ICALEO 2007 Paper #1305 (An Anisotropic Enhanced Thermal Conductivity Approach for Modelling Laser Melt Pools)

    An Anisotropic Enhanced Thermal Conductivity Approach for Modelling Laser Melt Pools
    Authors:
    Shakeel Safdar, The University of Manchester; Manchester Great Britain
    Andrew Pinkerton, The University of Manchester; Manchester Great Britain
    Richard Moat, The University of Manchester; Manchester Great Britain
    Lin Li, The University of Manchester; Manchester Great Britain
    Mohammad Sheikh, The University of Manchester; Manchester Great Britain
    Michael Preuss, The University of Manchester; Manchester Great Britain
    Philip Withers, The University of Manchester; Manchester Great Britain
    Presented at ICALEO 2007

    It is well estab...

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  • ICALEO 2007 Paper #1306 (Modeling of Laser Drilling Considering Multiple Reflection of Laser, Evaporation and Melt Flow)

    Modeling of Laser Drilling Considering Multiple Reflection of Laser, Evaporation and Melt Flow
    Authors:
    Etsuji Ohmura, Osaka University; Suita, Osaka Japan
    Satoru Noguchi, Osaka University; Suita Japan
    Jay Tu, North Carolina State University; Raleigh NC USA
    William Ray Harp, North Carolina State University; Raleigh NC USA
    Yoshinori Hirata, Osaka University; Suita Japan
    Presented at ICALEO 2007

    laser drilling was analyzed by considering multiple reflections and evaporation of material. In the keyhole formation process, the variation of the hole shape and the variation of the absorption of the laser power distribution in the wall were examined....

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  • ICALEO 2007 Paper #1401 (Visualization of Events Inside Kerfs during Laser Cutting of Fusible Metal)

    Visualization of Events Inside Kerfs during Laser Cutting of Fusible Metal
    Authors:
    Peter Yudin, ITAM SBRAS; Novosibirsk Russia
    Oleg Kovalev, ITAM SBRAS; Novosibirsk Russia
    Presented at ICALEO 2007

    The subject of the research is mechanism of melt removal and striated roughness generation. Being main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions produce no proof, as it has nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at real facility. Observation will become possible if one wall of the kerf can be made of glass. This possibility is utilized in pre...

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  • ICALEO 2007 Paper #1402 (Reduction of Thermal Damage in FR-4 with Progressive Percussion Drilling)

    Reduction of Thermal Damage in FR-4 with Progressive Percussion Drilling
    Authors:
    Leonard Migliore, Coherent, Inc.; Santa Clara CA USA
    Presented at ICALEO 2007

    Glass-epoxy circuit boards (FR-4) may be cut with carbon dioxide lasers. This process is commonly used for separating individual circuits from a larger multi-circuit panel. The cutting process, however, generates substantial amounts of carbonaceous decomposition products, resulting in charring. Charring has the potential to create unwanted conduction paths and makes the edge cosmetically unattractive. Charring may be mitigated by a multipass cutting procedure using pulses spaced apart by several times their diameter. A series of passes w...

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  • ICALEO 2007 Paper #1404 (Eliminating of Striation in Laser Cutting of Mild Steel)

    Eliminating of Striation in Laser Cutting of Mild Steel
    Authors:
    Mohamed Sobih, The University of Manchester; Manchester Great Britain
    Lin Li, The university of manchester; Manchester Great Britain
    Philip Crouse, The university of manchester; manchester Great Britain
    Presented at ICALEO 2007

    High-power laser cutting is extensively used in many industrial applications. An important weakness of this process is the formation of striations (regular lines on the cut surface), which affect the quality of the surfaces produced. The elimination of striation is thus of considerable importance, since it could open up a variety of novel high-precision applications. This study pre...

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