JLA Vol:6 Iss:2 (Laser safety standards in Europe)
Authors:
B. A. Tozer
Lasermet Ltd and City University, London, U.K.This paper reviews the present state of the standards‐making process in Europe, explaining such arcane terms as ‘CEN’, ‘CENELEC’, ‘Euronorm’ and ‘directive’. Standards‐making bodies in Europe work to strict guidelines with regard to their relationship to member countries of the EEC and EFTA, and work closely with the international standards bodies, IEC and ISO, to minimize duplication of effort and to ensure minimum conflict with international standards. The current situation with regard to laser safety standards in Europe is reviewed, and the author specul...
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JLA Vol:15 Iss:1 (Effect of wire feed position on laser welding with filler wire)
Authors:
A. S. Salminen
V. P. Kujanpa¨a¨
Lappeenranta University of Technology, Laser Processing Centre, Tuotantokatur 2, FIN 53850 Lappeenranta, FinlandThe utilization of the laser welding process with filler wire addition is often considered a complicated and difficult process which has too high accuracy demands for a work shop floor. This study shows the effect of some of the most important welding variables to the quality and efficiency of laser welding when welding with filler wire. The material used was a common structural steel St52/37 of 6 mm in thickness. The joint type used was a butt joint. Acceptable weld quality was achieved with most of the tested p...
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JLA Vol:19 Iss:1 (Combining high-speed laser perforation and cold roll forming for the production of biomedical microfiltration membranes)
Authors:
M. Baumeister
K. Dickmann
Laser Center University of Applied Sciences Muenster (LFM), Stegerwaldstrasse 39, 48565 Steinfurt, Germany
A. P. Hoult
SPI, 3 Wellington Park, Tollbar Way Hedge End, Southampton SO30 2QU, United KingdomA novel high speed two-step technique capable of performing large matrices of very small pores with micron dimensions in large sheets of thin stainless steel foils has been developed. This process combination is initiated by high-speed “on-the-fly” laser perforation. A 100 W fiber laser is capable of a very high drilling rate making it an attractive option for the creation of large drilling matrices ...
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JLA Vol:8 Iss:4 (Some aspects of laser heating of engineering materials)
Authors:
B. S. Yilbas
A. Z. Al‐Garni
Mechanical Eng. Dept., KFUPM, P.O. Box 1913, Dhahran, Saudi ArabiaLaser induced heating processes are important when a laser is used as a machine tool in industry, since the quality of the machining process strongly depends on the heating mechanism. The present study examines a heat transfer model that provides useful information on the laser induced interaction mechanism. Steady state and time dependent heating models are introduced and temperature profiles inside the materials are predicted. Using appropriate assumptions, the time for the surface temperature to reach 90% of its steady state value is estimated. To valid...
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JLA Vol:2 Iss:2 (Laser Induced Photochromic Flow Visualization)
Authors:
Thomas McWaid
Ekkehard Marschall
Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106The photochromic flow visualization technique has been utilized to study several different liquid flows. The technique utilizes radiachromic dyes that can be dissolved in a number of liquids. The resulting dye‐solvent solutions remain colorless in the absence of ultraviolet radiation; however, the solutions turn dark blue when exposed to ultraviolet light. A nitrogen pulse laser has been constructed for use as source of ultraviolet radiation. When sharply focused, the emitted beam of ultraviolet light produces a very narrow, well define...
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JLA Vol:17 Iss:3 (Experimental study of CO<sub>2</sub> laser welding inside a groove— Application to high thickness laser welding)
Authors:
M. Hamadou
R. Fabbro
F. Coste
S. Slimani
GIP GERAILP/LALP (CNRS) 16 bis, Av. Prieur de la Coˆte d’Or 94114 Arcueil, FranceLaser welding inside a groove has to be considered when a high thickness material is welded. The use of a groove shape allows the access of the laser beam to the lower part of the groove. The choice of the groove geometry (groove width, depth, or aperture angle), as well as the assist gas setup (leading, trailing or backside protection) are then significant operating parameters for the process control. In this study, U- and V-shaped groove welding with a CO2 laser was investigated. The U-shaped ...
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JLA Vol:22 Iss:1 (Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy)
Authors:
Hitoshi Ozaki
Muneharu Kutsuna
Graduate School of Engineering, Nagoya University, 1, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Shigeyuki Nakagawa
Kenji Miyamoto
Research Center, Nissan Motor Co., Ltd., 1, Natsushima-cho, Yokosuka-shi, Kanagawa 237-8523, JapanThere is a subject to reduce the weight of car body by replacing steel to aluminum alloys as some structural body parts for improving fuel consumption and suppressing CO2 generation. As one of the solutions, the hybrid body structure concept using aluminum alloys and high strength steels is proposed recently. However, it is well known that fusion welding of st...
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JLA Vol:25 Iss:5 (Crack-free laser dicing of glass in the microelectronics industry)
Authors:
Guillaume Savriama
GREMI-UMR 7344, CNRS/Universite´ d'Orle´ans, 14 rue d'Issoudun, BP 6744, F-45067 Orle´ans cedex 2, France and STMicroelectronics, 10 rue de Thalès de Milet, CS 97155, 37071 Tours Cedex 2, France
Jose´ Mendez
Laurent Barreau
STMicroelectronics, 16 rue Pierre et Marie Curie, BP 7155, F-37071 Tours Cedex2, France
Chantal Boulmer-Leborgne
Nadjib Semmar
GREMI-UMR 7344, CNRS/Universite´ d'Orle´ans, 14 rue d'Issoudun, BP 6744, F-45067 Orle´ans cedex 2, FranceThis paper investigates laser dicing of glass (commercial Borofloat
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JLA Vol:24 Iss:4 (Direct laser writing-mediated generation of standardized topographies for dental implant surface optimization)
Authors:
Rainer Wittig
Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany
Erik Waller
Georg von Freymann
Arbeitsgruppe Optische Technologien und Photonik und Forschungszentrum OPTIMAS, Fachbereich Physik, Technische Universita¨t Kaiserslautern, 67663 Kaiserslautern, Germany
Rudolf Steiner
Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, GermanyThe functionalization of dental implants, aiming at the improvement of long-term acceptance, is of pivotal interest in dental research. Bone, connectiv...
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JLA Vol:5 Iss:1 (Tutorial Guide: Laser Measurement Techniques Guide For Hazard Evaluation. Part 1)
Authors:
Terry Lyon
Laser Microwave Division, U.S. Army Environmental Hygiene AgencyA tutorial guide is presented to provide uniform guidance when performing radiometric measurements upon laser systems to perform a hazard evaluation. This guide was requested by and presented to the Department of Defense (DOD) Laser System Safety Working Group (LSSWG) to serve as a standardized method when performing hazard evaluations primarily upon tactical and training military laser systems including laser rangefinders and designators. Technical information is provided in detail to select a suitable detector, preform radiometric measurements, assess laser system pointing errors, calculate laser pr...
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