PICALO 2006 Paper #M101 (Fabrication of Microchannels in PMMA by Femtosecond Laser Pulses (Invited Paper))

Fabrication of Microchannels in PMMA by Femtosecond Laser Pulses (Invited Paper)
Authors:
Daniel Day, Centre for Micro-Photonics; Victoria Australia
Min Gu, Centre for Micro-Photonics; Hawthorn VIC Australia
Presented at PICALO 2006

Microchannels are fabricated in a poly(methyl methacrylate) substrate by high repetition rate, nanojoule femtosecond laser pulses. Microchannels with diameters of 8 - 15 m can be fabricated at a wavelength of 750 nm and a fabrication speed of 800 m/s using 80 fs pulses at a repetition rate of 80 MHz with energy of 0.9 nJ/pulse. The size and shape of the microchannels can be controlled by changing the fabrication parameters of speed, the number o...

PICALO 2006 Paper #903 (Camera Based System for Laser Beam Online Monitoring)

Camera Based System for Laser Beam Online Monitoring
Authors:
Jan Hannweber, Fraunhofer IWS; Dresden Germany
Berndt Brenner, Fraunhofer IWS; Dresden Germany
Eckhard Beyer, Fraunhofer IWS; Dresden Germany
Steffen Bonss, Fraunhofer IWS; Dresden Germany
Presented at PICALO 2006

Surface hardening with high power diode lasers has been developed to an industrial accepted process in the last years. The multiple adoption of this complex process in the industrial environment make great demands on process control, safety und simplification. To meet these demands a special camera based monitoring system has been developed. This system is able to monitor many laser beam characteristics during the hardening process online, which creates new options regarding the process quality control. Furthermore typical commercial high power laser deliver two different wavelength superposed to one beam. For a proper verification of the beam characteristics the system can measure each wavelength separately in real time. It is possible to acquire and control laser beam shaping for example by a scanning system. As sensor a low cost camera is used. All parameters like accuracy, resolution and the measured spectrum are adaptable to the specific requirements. The system can be integrated very easily in existing hardening systems controlled by software. The state of the development of this system is demonstrated on typical applications.

PICALO 2006 Paper #902 (In-Process Monitoring During Laser Beam Welding)

In-Process Monitoring During Laser Beam Welding
Authors:
Christoph Deininger, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Friedrich Dausinger, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Juergen Mueller-Borhanian, Forschungsgesellschaft fuer Strahlwerkzeuge (FGSW); Stuttgart Germany
Presented at PICALO 2006

One reason for the increasing use of laser welding in various industries is the enhancement of economic efficiency compared to competing techniques. To utilize this advantage automated process control strategies are required. One established method of in-process monitoring during laser beam welding is the use of single detectors like photo di...

PICALO 2006 Paper #901 (High-Speed and Camera Based Temperature Measurement and Control for High Power Laser Scanning Systems)

High-Speed and Camera Based Temperature Measurement and Control for High Power Laser Scanning Systems
Authors:
Berndt Brenner, Fraunhofer Institute for Materials & Beam Technology; Dresden Germany
Eckhard Beyer, Fraunhofer Institute for Materials & Beam Technology; Dresden Germany
Marko Seifert, Fraunhofer-Institute Material & Beam Technology; Dresden Germany
Steffen Bonss, Fraunhofer Material & Beam Technology; Dresden Germany
Jan Hannweber, Fraunhofer IWS; Dresden Germany
Presented at PICALO 2006

Laser beam scanning systems, designed by Fraunhofer IWS Dresden, for heat treatment of metals with high power diode lasers are used in industrial s...

PICALO 2006 Paper #810 (Use of Electromagnetic Induced Forces for Active Forming of Coating Geometry)

Use of Electromagnetic Induced Forces for Active Forming of Coating Geometry
Authors:
Johannes Wilden, Technishe Universitat Ilmenau; Neuhaus 1 Germany
Jean Pierre Bergmann, Technical University Ilmenau; Ilmenau Germany
Markus Dolles, Technical University Ilmenau; Ilmenau Germany
Presented at PICALO 2006

Laser beam cladding represents a technology, which allows high quality coating technique towards other thermal coating processes as for example a good metallic bonding between coating and base material, a fine microstructure and good mechanical properties due to the rapid cooling are reached. Moreover the very small dilution allows to ensure the desired metallurgic pro...

PICALO 2006 Paper #809 (Surface Laser Alloying with Ceramic Powders of the X40CrMoV5-1 Tool Steel)

Surface Laser Alloying with Ceramic Powders of the X40CrMoV5-1 Tool Steel
Authors:
A. Polok, Silesian University of Technology; Gliwice Poland
E. Jonda, Silesian University of Technology; Gliwice Poland
Leszek Dobrzanski, Silesian University of Technology; Gliwice Poland
Presented at PICALO 2006

This paper presents the results of laser treatment influence on structure and properties of the surface of the X40CrMoV5-1 hot work tool steel, using the high power diode laser (HPDL) for remelting and alloying. In this work structure changes as well as hardness and roughness are investigated. The goal of this work was also to determine technological conditions for remelting of...

PICALO 2006 Paper #806 (Comparison of the Structures of the Hot-Work Tool Steels Laser Modified Gradient Layers)

Comparison of the Structures of the Hot-Work Tool Steels Laser Modified Gradient Layers
Authors:
Eugeniusz Hajduczek, Institute of Engineering Materials and Biomaterials, Silesian Univ. of Technology; Gliwice Poland
Leszek Dobrzanski, Institute of Engineering Materials and Biomaterials, Silesian Univ. of Technology; Gliwice Poland
Miroslaw Bonek, Institute of Engineering Materials and Biomaterials, Silesian Univ. of Technology; Gliwice Poland
Presented at PICALO 2006

The objective of the present work was to study the modification of the microstructure of hot-work tool steel X40CrMoV5-1 during the surface modifying by means of laser technology. The aim of such treatment...

PICALO 2006 Paper #805 (Improving Polymer Surfaces using Laser Dispersion of Ceramic Micro- and Nanoparticles)

Improving Polymer Surfaces using Laser Dispersion of Ceramic Micro- and Nanoparticles
Authors:
Michael Hustedt, Laser Zentrum Hannover E.V.; Hannover Germany
A. von Busse, Laser Zentrum Hannover e.V.; Hannover Germany
Stephan Barcikowski, Laser Zentrum Hannover e.V.; Hannover e.V. Germany
A. Ostendorf, Laser Zentrum Hannover e.V.; Hannover Germany
H. Haferkamp, Laser Zentrum Hannover e.V.; Hannover Germany
Presented at PICALO 2006

Laser dispersion of ceramic micro- and nanoparticles is applied to improve properties of thermoplastic polymer surfaces like abrasion resistance, hardness or antimicrobial effect. Processing polymer workpieces like s...

PICALO 2006 Paper #804 (Micro Hardening of Carbon Steels with an Elliptical Beam of Direct Diode Laser)

Micro Hardening of Carbon Steels with an Elliptical Beam of Direct Diode Laser
Authors:
Junji Morimoto, Kinki University; Higashi-Osaka,Osaka Japan
Nobuyuki Abe, Osaka University; Ibaraki, Osaka Japan
Masahiro Tsukamoto, Osaka University; Ibaraki, Osaka Japan
Shigeru Tanaka, Sanyo Metal Works Co., Ltd.; Miki, Hyogo Japan
Shinji Fukuhara, Kinki University; Higashi-Osaka, Osaka Japan
Yutaka Katoh, Kinki University; Higashi-Osaka, Osaka Japan
Presented at PICALO 2006

Transformation hardening of metals has been used to increase the hardness and wear resistance of metal surface. Laser heat sources are most convenient tools for the ac...

PICALO 2006 Paper #802 (Non-conventional Laser Beam Geometries for Laser Transformation Hardening of Mild Steels)

Non-conventional Laser Beam Geometries for Laser Transformation Hardening of Mild Steels
Authors:
Shakeel Safdar, The University of Manchester; Manchester Great Britain
Lin Li, The University of Manchester; Manchester Great Britain
M.A. Sheikh, The University of Manchester; Manchester Great Britain
Zhu Liu, The University of Manchester; Manchester Great Britain
Presented at PICALO 2006

In transformation hardening of steels it is desirable to have a slow heating rate and a rapid cooling rate to achieve full transformation. To date laser transformation hardening has been carried out using circular or rectangular beams which result in rapid heating and coolin...