• PICALO 2008 Paper #904 (New Developments in Co2 Laser Technology Enable New Applications)

    New Developments in Co2 Laser Technology Enable New Applications
    Authors:
    Frank Gaebler, Coherent Inc; Bloomfield CT USA
    Presented at PICALO 2008

    Sealed off CO2 lasers are proven in industry for high volume manufacturing applications such as cutting and drilling, processing of glass and ceramics, and flexography. Cutting of thin metal, plastic or organic materials like leather, wood, paper textiles has become an established application in the market. Cutting of glass and PCB materials is only now becoming mature. Laser users vary from job shop and automotive to semiconductor manufacturing; from dusty and oily manufacturing floors to clean room environments. In comparison to High Power CO2 lase...

    $28.00

  • PICALO 2008 Paper #903 (Reliable High-Power Laser Diode Arrays)

    Reliable High-Power Laser Diode Arrays
    Authors:
    Brad Debok, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
    Ed Stephens, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
    Jeremy Junghans, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
    Ryan Feeler, Northrop Grumman Cutting Edge Optronics; St. Charles MO USA
    Presented at PICALO 2008

    Northrop Grumman / Cutting Edge Optronics has developed a line of microchannel-cooled laser diode arrays in which the coolant is electrically isolated from the current path. As a result, these arrays do not require the use of deionized water. The thermal performance of these arrays is presented and, in one case, shown to far exceed the performance of standard copper microchannel-cooled packages. This sets them apart from other non-DI microchannel coolers currently on the market which typically have worse thermal performance than copper MCCs. These newly-developed coolers are compatible with other technologies developed by NGCEO that enable long lifetimes under harsh operating conditions. In particular, these arrays can be assembled using hard-solder technology that enables power-cycled and high-current operation. The soldering technology also generates arrays that are easily lensed and satisfy a wide range of direct diode needs, including welding, marking, and complex line generation applications. These microchannel-cooled arrays represent an important next step in the solid state laser industry. They allow for much simpler (non-deionized) cooling systems while maintaining excellent thermal performance and lifetime.

    $28.00

  • PICALO 2008 Paper #902 (The Design Method of High-efficiency Coupling of Fiber for the High-power Solid Laser)

    The Design Method of High-efficiency Coupling of Fiber for the High-power Solid Laser
    Authors:
    Baohua Wang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
    Menghua Jiang, Institute of Laser Engineering of Beijing University of Technology; Beijing USA
    Kai Pang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
    Li Qiang, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
    Yongling Hui, Institute of Laser Engineering of Beijing University of Technology; Beijing Peoples Republic of China
    Presented at PI...

    $28.00

  • PICALO 2008 Paper #808 (The Absorptance of Metal Surfaces to Nd:YAG/Nd:YLF Laser Light)

    The Absorptance of Metal Surfaces to Nd:YAG/Nd:YLF Laser Light
    Authors:
    D. Bergstrom, Mid Sweden University; Ostersund Sweden
    John Powell, Lulea University of Technology; Lulea Sweden
    Alexander Kaplan, Lulea University of Technology; Lulea Sweden
    Presented at PICALO 2008

    The absorptance of real metallic engineering surfaces used in Laser Material Processing depends strongly upon the particular surface conditions, including the degree of roughness and oxidation. In this paper the influence of surface topography on Nd:YAG/Nd:YLF laser absorptance has been studied, both experimentally and theoretically, on a set of randomly selected as-received metallic engineering surfac...

    $28.00

  • PICALO 2008 Paper #806 (Three Dimensional Analytical and Finite Element Methods for Simulating a Moving Melt Pool with Mass Addition)

    Three Dimensional Analytical and Finite Element Methods for Simulating a Moving Melt Pool with Mass Addition
    Authors:
    Andrew Pinkerton, The University of Manchester; Manchester Great Britain
    Alhaji Kamara, The University of Manchester; Manchester Great Britain
    Kamran Shah, The University of Manchester; Manchester M60 1Qd Great Britain
    Shakeel Safdar, Pakistan National University of Sciences and Technology (Nust); Risalpur Pakistan
    Lin Li, The University of Manchester; Manchester Great Britain
    Presented at PICALO 2008

    Laser Direct Metal Deposition, alloying and similar multiple layer additive processes are recognised as difficult to model becau...

    $28.00

  • PICALO 2008 Paper #805 (Heat Transfer and Fluid Flow during Double-track Laser Cladding of H13 Tool Steel (Invited Paper))

    Heat Transfer and Fluid Flow during Double-track Laser Cladding of H13 Tool Steel (Invited Paper)
    Authors:
    Jyoti Mazumder, University of Michigan ; Ann Arbor MI USA
    Xiuli He, University of Michigan; Ann Arbor MI USA
    Presented at PICALO 2008

    Laser cladding based Direct Metal Deposition (DMD) has received significant attention due to its diversified potential for material processing, such as innovative alloying, metallic coating, rapid prototyping and components repairing. Numerical simulation not only helps to understand the complex physical phenomena and the underlying theory involved in this process, it can also be used in the process prediction and system control. The evolution ...

    $28.00

  • PICALO 2008 Paper #802 (Therotical and Experimental Research on Temperature Field of Coaxial Powder Flow in Laser Cladding)

    Therotical and Experimental Research on Temperature Field of Coaxial Powder Flow in Laser Cladding
    Authors:
    Xichen Yang, Laser Processing Center,Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Zhe Dong, Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Li Li, Tianjin Polytechnic University; Tianjin Peoples Republic of China
    Presented at PICALO 2008

    Threr are three phsical processing of heat transfer,mass trasfer and convection in coaxial powder flow. Temperature field of coaxial powder
    is important for laser manufacturing.Computer simulation of temperature field has been made from two phases flow of powder/gas.Experimental measuremet ...

    $28.00

  • PICALO 2008 Paper #708 (Study on Welding Characteristics of Combining Laser Welding and Resistance Seam Welding Joined Ti6Al4V Alloy Lap Joints)

    Study on Welding Characteristics of Combining Laser Welding and Resistance Seam Welding Joined Ti6Al4V Alloy Lap Joints
    Authors:
    Xinge Zhang, Harbin Institute of Technology; Harbin Peoples Republic of China
    Liqun Li, Harbin Institute of Technology,; Harbin Peoples Republic of China
    Zhenglong Lei, Harbin Institute of Technology; Harbin Peoples Republic of China
    Yanbin Chen, Harbin Institute of Technology; Harbin Peoples Republic of China
    Presented at PICALO 2008

    With deep penetration laser welding of lap joint and tee-joint, porosity is apt to occur and melting width at lap interface is too narrow to support high shear load; on the other hand, the process n...

    $28.00

  • PICALO 2008 Paper #707 (Guidance and Stabilisation of Electric Arc Welding using Nd:Yag Laser Radiation)

    Guidance and Stabilisation of Electric Arc Welding using Nd:Yag Laser Radiation
    Authors:
    Christian Stahlhut, Laser Zentrum Hannover ; Hannover Germany
    Jörg Hermsdorf, Laser Zentrum Hannover e.V:; Hannover Germany
    Rainer Kling, Laser Zentrum Hannover ; Hannover Germany
    Alexander Barroi, Laser Zentrum Hannover E.V.; Hannover Germany
    Frank Otte, Laser Zentrum Hannover E. V. ; Hannover Germany
    Presented at PICALO 2008

    The trend in production industry to lightweight construction using aluminium and high and higher strength steels calls for faster, yet stable production processes. To realise these requirements, we have developed a gas metal arc wel...

    $28.00

  • PICALO 2008 Paper #706 (A Comparison of the Pitting Corrosion Behavior of 304L Stainless Steel by Tig, Laser and Laser-Tig Hybrid Welding)

    A Comparison of the Pitting Corrosion Behavior of 304L Stainless Steel by Tig, Laser and Laser-Tig Hybrid Welding
    Authors:
    Jun Yan, Huazhong University of Science and Technology,; Wuhan Peoples Republic of China
    Ming Gao, Huazhong University of Science and Technology,; Wuhan Peoples Republic of China
    Xiaoyan Zeng, Huazhong University of Science and Technology; Wuhan Peoples Republic of China
    Presented at PICALO 2008

    Laser-TIG hybrid welding is a technique which develops very rapidly in recent ten years. There have been a lot of reports about the laser-TIG hybrid welding technique and the quality controlling of the welding beads. However, there seems few reports about...

    $28.00

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