• PICALO 2006 Paper #303 (Continuous Wave Nd:YAG Laser Cladding of Stellite 6 Muti-Track Layers on Mild and AISI 4016 Steel)

    Continuous Wave Nd:YAG Laser Cladding of Stellite 6 Muti-Track Layers on Mild and AISI 4016 Steel
    Authors:
    M. Franklin, University of Wollongong; Wollongong Australia
    Shao Huang, University of Wollongong; Wollongong Australia
    M. Brandt, Industrial Research Institute Swinburne, Swinburne University of Technology; Melbourne Australia
    A.K. Tieu, University of Wollongong; Wollongong Australia
    T. Chandra, University of Wollongong; Wollongong Australia
    Presented at PICALO 2006

    The level of sliding friction between the mating top centre and centre bowl liner components of a rail freight truck centre bearing provides both positive and negative effects...

    $28.00

  • PICALO 2006 Paper #304 (Effect of Increment and Single-Track Geometry on the Formation of Multi-track Laser Cladding)

    Effect of Increment and Single-Track Geometry on the Formation of Multi-track Laser Cladding
    Authors:
    Jim Harris , Industrial Research Institute Swinburne, Swinburne University of Technology ; Melbourne Australia
    Milan Brandt, Industrial Research Institute Swinburne, Swinburne University of Technology; Melbourne Australia
    Shoujin Sun, Industrial Research Institute Swinburne, Swinburne University of Technology; Melbourne Australia
    Yvonne Durandet, Industrial Research Institute Swinburne, Swinburne University of Technology ; Melbourne Australia
    Presented at PICALO 2006

    The variation of track geometry during multi-track laser cladding of stellite 6 on mild st...

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  • PICALO 2006 Paper #305 (Residual Stresses in Al7075 Alloy Plate Laser Clad with AL-12SI Alloy Powder)

    Residual Stresses in Al7075 Alloy Plate Laser Clad with AL-12SI Alloy Powder
    Authors:
    Yvonne Durandet, Industrial Research Institute of Swinburne University of Technology (IRIS); Hawthorn Australia
    R. Deam, Industrial Research Institute Swinburne; Hawthorn Australia
    Maurice Ripley, Australian Nuclear Science and Technology Organisation (ANSTO); Lucas Heights Australia
    Philip Bendeich, Australian Nuclear Science and Technology Organisation (ANSTO); Lucas Heights Australia
    Milan Brandt, Industrial Research Institute of Swinburne University of Technology (IRIS); Hawthorn Australia
    Qianchu Liu, Defence Science and Technology Organisation (DSTO); Fisher...

    $28.00

  • PICALO 2006 Paper #306 (Study of Melting Characteristics of Wire in Laser Cladding Process)

    Study of Melting Characteristics of Wire in Laser Cladding Process
    Authors:
    Nazmul Alam, CSIRO; Adelaide Australia
    Presented at PICALO 2006

    Laser cladding is becoming an attractive process for the repair and hardfacing of high-value components. The consumables used for these cladding processes are usually in the form of metallic powders due to the ease of operation. However, the use of metal powder is mostly limited to downhand position cladding process. Wire can also be used in laser cladding process and can be fed directly into the laser beam out-of-positions. However, in such cases dilution with the work piece can be difficult to control. This work has investigated aspects of the wire c...

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  • PICALO 2006 Paper #307 (Microstructural Features and Cracking of Laser Cladding on 7XXX Aluminium Alloys with Al-12%Si Powder)

    Microstructural Features and Cracking of Laser Cladding on 7XXX Aluminium Alloys with Al-12%Si Powder
    Authors:
    Qianchu Liu, DSTO; Melbourne Australia
    Presented at PICALO 2006

    There has been increasing interest to apply laser cladding technology on aluminium alloys for repairing damaged surfaces of aircraft components by fatigue or corrosion. However, the mechanical or corrosion properties strongly depend on the microstructures. This paper presents the study of the microstructural features in both the clad layer and the Heat-affected zones (HAZs). The aluminium-12%silicon (Al-12%Si) powder was used for cladding of 7075 Al alloy. The main features in the clad layer are fine -aluminium dendriti...

    $28.00

  • PICALO 2006 Paper #401 (Basic Understanding on Beam - Plasma Interaction in Laser Welding)

    Basic Understanding on Beam - Plasma Interaction in Laser Welding
    Authors:
    Akira Matsunawa, Osaka Univ.; Hyogo Japan
    Jong-Do Kim, Korean Maritime University; Korea
    Presented at PICALO 2006

    In early development days of laser welding, most of engineers and scientists believed that the laser induced plasma was the high temperature and pressure plasma which could reflect the incident beam by plasma due to the plasma electron frequency. However, the necessary electron number density to cut-off the incident beam are 1019 1/cm3 for YAG laser (1.06 μm) and 1021 1/cm3 for CO2 laser (10.6 μm). These electron number densities are unable to achieve in the one atmospheric pressure thermal...

    $28.00

  • PICALO 2006 Paper #402 (Convection of Energy in Partially Ionised Vapour in Laser Keyhole Welding)

    Convection of Energy in Partially Ionised Vapour in Laser Keyhole Welding
    Authors:
    John Dowden, University of Essex; Colchester Essex Great Britain
    Presented at PICALO 2006

    Laser power is absorbed in laser keyhole welding by several mechanisms. In CW CO2 welding absorption into the partially ionised vapour in the keyhole by the processes of inverse bremsstrahlung and thermal conduction can be important. The energy is then transferred to the work piece by thermal conduction through the vapour. This process has recently been partially modelled mathematically. Experimental observations give a wide range of values for the possible vapour temperatures and as a result, widely varying estimates for th...

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  • PICALO 2006 Paper #403 (The Reflectance of Steels and Non-ferrous Alloys to Nd:YAG and Nd:YLF Laser Light)

    The Reflectance of Steels and Non-ferrous Alloys to Nd:YAG and Nd:YLF Laser Light
    Authors:
    David Bergström, Mid Sweden University; stersund Sweden
    John Powell, Laser Expertise Ltd.; Nottingham Great Britain
    Alexander Kaplan, Lulea University of Technology; Lulea Sweden
    Presented at PICALO 2006

    The measurement of reflectance is important for the analysis and modelling of laser-material interactions. Unfortunately, most of the reflectance data presently available consider only polished pure metals rather than the commercially available (unpolished, oxidised) alloys which are actually being processed. This paper presents the results of reflectance measurements carried ...

    $28.00

  • PICALO 2006 Paper #404 (The Role of Analytic Heat Flow Models in Laser Processing)

    The Role of Analytic Heat Flow Models in Laser Processing
    Authors:
    Rowan Deam, Swinburne University; Melbourne, Victoria Australia
    Presented at PICALO 2006

    The development of laser processing procedures often requires knowing the temperature at selected places and times on the workpiece being treated for a range of processing conditions. The usual approach is to run a computer model of the process in order to speed up the development and optimisation of the process parameters. Setting up finite difference or finite element numerical models can be time consuming and prone to error, for those of us not up to speed in the discipline of numerical modelling. We present the results of an analytical m...

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  • PICALO 2006 Paper #501 (Hybrid Laser-Arc Processing)

    Hybrid Laser-Arc Processing
    Authors:
    William Steen, Emeritus Professor of the University of Liverpool; Herts Great Britain
    Presented at PICALO 2006

    The concept of adding cheap power to enhance the high quality power from a laser seems a sensible approach to developing useful industrial processes that require cheap high power. The "cheap" power could be reactive gases, flames, plasmas, arcs or induction. Ever since oxygen assisted cutting was invented in 1967 various attempts at this mixed power processing have been developed or suggested. Due to the need for greater process throughput with looser manufacturing precision there has been a marked revival of interest in hybrid processes of late. T...

    $28.00

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