JLA Vol:16 Iss:3 (A procedure for the estimation of intrabeam hazard distances and optical density requirements under the ANSI Z136.1-2000 Standard)
Authors:
Robert J. Thomas
Benjamin A. Rockwell
Air Force Research Laboratory, Brooks AFB, Texas 78235-5215
Wesley J. Marshall
USACHPPM, Aberdeen Proving Ground, Maryland 21010-5422
Robert C. Aldrich
Mary F. Gorschboth
Sheldon A. Zimmerman
Dahlgren Division, Naval Surface Warfare Center, Dahlgren, Virginia 22448-5100
R. James Rockwell
Rockwell Laser Industries, Cincinnati, Ohio 45243Over the past few years, a comprehensive rewrite of the American National Standard for Safe Use of Lasers (ANSI Z136.1) has been conducted [American National Standards Institute, Z136.1-2000 America...
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JLA Vol:21 Iss:1 (Enhancing dual phase steel formability by diode laser heat treatment)
Authors:
Edoardo Capello
Barbara Previtali
Politecnico di Milano, Dipartimento di Meccanica Via La Masa 1, I-20156 Milan, ItalyThis paper studies the effect of different typologies of surface treatment by diode laser on the local formability of dual phase steel. An analytical thermal model allowed the temperature and cooling rate curves to be predicted and used to select the process parameter conditions. Microhardness measurements, microstructure observations, mechanical tensile test, and Erichsen cup test allowed the positive effect of the heat treatment on dual phase steel formability to be quantified.
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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: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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