• ICALEO 2005 Paper #P565 (Surface Treatment of Welded Duplex Stainless Steels by Diode Laser)

    Surface Treatment of Welded Duplex Stainless Steels by Diode Laser
    Authors:
    Barbara Previtali, Politecnico Di Milano Dipartimento Di Meccanica; Milano Italy
    Edoardo Capello, Politecnico Di Milano Dipartimento Di Meccanica; Milano Italy
    Maurizio Vedani, Politecnico Di Milano Dipartimento Di Meccanica; Milano Italy
    Moreno Castelnuovo, Politecnico Di Milano Dipartimento Di Meccanica; Milano Italy
    Presented at ICALEO 2005

    In this paper the recovery of the laser welded microstructure of Duplex Stainless Steel (DSS) by means of diode laser treatment is investigated. The goal of the laser surface treatment is to obtain a well balanced austenite-ferrite structure ...

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  • ICALEO 2005 Paper #P567 (Development of an Advanced Dual Beam Head for Laser Lap Joining of Zinc Coated Steel Sheet)

    Development of an Advanced Dual Beam Head for Laser Lap Joining of Zinc Coated Steel Sheet
    Authors:
    Mariana Forrest, DaimlerChrysler Corporation; Troy MI USA
    Feng Lu, Feng Lu Consulting; Bloomfield Hills MI USA
    Presented at ICALEO 2005

    Laser welding has shown a lot of advantages over the currently widely used resistance spot welding for automobile assembly application. These include cost savings (due to increased production speed, reduced assembly line length, etc.) and performance improvement (increased stiffness, less heat affected zone width and distortion etc). The only major problem that prevents the application of laser welding to mass production application is the zinc exp...

    $28.00

  • ICALEO 2005 Paper #P568 (Laser Developed Al-Cr Surface Alloys: Microstructure, Mechanical and Wear Behavior)

    Laser Developed Al-Cr Surface Alloys: Microstructure, Mechanical and Wear Behavior
    Authors:
    Amelia Almeida, Instituto Superior Tecnico, Dep. Materials; Lisbon PORTUGAL
    Patricia Carvalho, Instituto Superior Tecnico; Lisboa Portugal
    Rui Vilar, Instituto Superior Tecnico; Lisboa Portugal
    Presented at ICALEO 2005

    Al alloys with enhanced surface hardness and wear resistance were produced by laser surface alloying Cr into Al. Surface alloys with composition ranging from 10 to 20 wt.%Cr were produced. Their microstructure consists of intermetallic compound particles dispersed in a matrix of a-Al. At low solidification rates the intermetallic compound particles are of Al4Cr ph...

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  • ICALEO 2005 Paper #P569 (Sealing of Human Dentinal Tubules by KrF 248 nm Laser Radiation)

    Sealing of Human Dentinal Tubules by KrF 248 nm Laser Radiation
    Authors:
    Sivakumar Manickam, IST; Lisboa Portugal
    Rui Vilar, Instituto Superior Tecnico; Lisboa Portugal
    Vitor Oliveira, Instituto Superior Tecnico; Lisboa Portugal
    Presented at ICALEO 2005

    Exposure of dentinal tubules is the common cause of dental hypersensitivity. Exposed dentin tubules are unduly sensitive to thermal, mechanical, or chemical stimuli. Treatment for this should be fast, painless on application and long lasting. However most of the conventional treatments are either ineffective or relatively short-lived. The aim of the present investigation is to study the use of the KrF excimer laser radi...

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  • ICALEO 2005 Paper #P570 (Using Neural Networks and Dempster-Shafer Theory for Failure Detection and Diagnosis of Excimer Laser Ablation)

    Using Neural Networks and Dempster-Shafer Theory for Failure Detection and Diagnosis of Excimer Laser Ablation
    Authors:
    Ronald Setia, Georgia Institute of Technology; Atlanta GA USA
    Gary May, Georgia Institute of Technology; Atlanta GA USA
    Presented at ICALEO 2005

    With the continuing advancement of the use of excimer laser systems in microsystems packaging have come an increasing need to offset the high capital equipment investment and lower equipment downtime. This paper presents a methodology for in-line failure detection and diagnosis of the excimer laser ablation process. Our methodology employs response data originating directly from the tool and characterization of microvias ...

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  • ICALEO 2005 Paper #P572 (Researches of Cast Iron Piston Rings Strengthened by Laser)

    Researches of Cast Iron Piston Rings Strengthened by Laser
    Authors:
    Zhang Qingmao, South China Normal University; Guangzhou Peoples Republic of China
    Wenjin Liu, The Center of Laser Processing, Dept. of Mechanical Engineering, Tsinghua Univ.; Beijing Peoples Republic of China
    Jianhong Liao, The Center of Laser Processing, School for Information and Photoelectron Science Engineering, South China Normal Univ.; Guangzhou Peoples Republic of China
    Xiwei Zhang, Wuhan Univ.; Wuhan Peoples Republic of China
    Presented at ICALEO 2005

    The SRV tests show that laser remelting, laser alloying and laser cladding processes reduce the wear loss of both the piston ring an...

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  • ICALEO 2005 Paper #P573 (A Method to Improve Efficiency and Reliability of Laser Cladding Processing by Plasma-Augmented-Laser-Cladding)

    A Method to Improve Efficiency and Reliability of Laser Cladding Processing by Plasma-Augmented-Laser-Cladding
    Authors:
    Johannes Wilden, TU Ilmenau; Ilmenau Germany
    Jean Pierre Bergmann, TU Ilmenau; Ilmenau Germany
    Markus Dolles, TU Ilmenau; Ilmenau Germany
    Presented at ICALEO 2005

    Laser cladding offers several advantages as low dilution, low thermal influence and distortion of the components and a fine microstructure due to the high cooling rate. Nevertheless the set of laser cladding in the industrial production is nowadays limited to few applications, as the efficiency of laser sources is still too low and the running costs are too high. The absorption behaviour of...

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  • ICALEO 2005 Paper #P574 (Monitoring Laser Cladding)

    Monitoring Laser Cladding
    Authors:
    Keng Leong, SiMMtec; Allison Park PA USA
    H.C. Man, The Hong Kong Polytechnic University; Hung Hom Hong Kong
    Kenneth Ho, The Hong Kong Polytechnic University; Hung Hom Hong Kong
    Presented at ICALEO 2005

    Laser cladding is used in the repair of high value industrial components such as rollers, axles and turbine blades. The absence of defects is essential to the remanufacturing process. Consequently, a non-intrusive cladding monitor that is robust in detecting defects and minimizes false positives would be very desirable. We report in this work a method for the monitoring of laser cladding. It is an adaptation of a commercially availa...

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  • ICALEO 2005 Paper #Plenary1 (Diode Lasers for Industrial Applications)

    Diode Lasers for Industrial Applications
    Authors:
    Martin Behringer, OSRAM Opto Semiconductors; Regensburg Germany
    Presented at ICALEO 2005

    The development of diode lasers started about 40 years ago with low power devices that were operated at cryogenic temperatures. Since then diode lasers made great progress in power, lifetime and costs. Some of the first widespread applications like telecommunication and home entertainment used the advantage of narrow linewidth and compactness, rather than efficiency and power. Especially in the last decade, great improvements were made in terms of output power as well as in costs of operation. From about 10W per 1cm laser bar 15 years ago, they have deve...

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  • ICALEO 2005 Paper #Plenary2 (Fibre Lasers: The New Wave in Material Processing)

    Fibre Lasers: The New Wave in Material Processing
    Authors:
    David Parker, SPI; Southampton UK
    David Payne, Optoelectronic Research Centre, Univ. of Southampton; Southampton UK
    Presented at ICALEO 2005

    In the last few years, fibre lasers have established themselves as the preferred laser source in many applications. The combination of small size, maintenance-free operation, thermal and electrical efficiency, combined with outstanding (diffraction limited) beam quality, have made the fibre laser an attractive alternative to more established technologies, and in some cases the enabling technology. Unique among high power lasers, the fiber laser is monolithic, the light being entirely c...

    $28.00

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