Laser Microwave Division, U.S. Army Environmental Hygiene Agency
A 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...
JLA Vol:17 Iss:3 (Experimental study of CO<sub>2</sub> laser welding inside a groove— Application to high thickness laser welding)
GIP GERAILP/LALP (CNRS) 16 bis, Av. Prieur de la Coˆte d’Or 94114 Arcueil, France
Laser 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 ...
JLA Vol:22 Iss:1 (Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy)
Graduate School of Engineering, Nagoya University, 1, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Research Center, Nissan Motor Co., Ltd., 1, Natsushima-cho, Yokosuka-shi, Kanagawa 237-8523, Japan
There 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...
JLA Vol:23 Iss:1 (Optimal process parameters for thermoplastic polyetheretherketone joints fabricated using transmission laser welding and Lumogen<sup>®</sup> IR absorptive pigment)
School of Physics, University of Sydney, New South Wales 2006, Australia and Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia
Raymax Applications, P.O. Box 958, Newport Beach, New South Wales 2106, Australia
Natalie L. James
Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia
David R. McKenzie
School of Physics, University of Sydney, New South Wales 2006, Australia
This study investigates the effects of the process parameters (laser power and irradiation time) on the bond quality of transmission laser welded polyether...
JLA Vol:7 Iss:2 (A study of polarization‐maintaining fiber characteristics with applications to force and displacement sensing)
P. V. P. Yupapin
K. T. V. Grattan
A. W. Palmer
An experimental investigation of three different types of highly birefringent fiber sensor element configured as a force and a displacement sensor is described. From the coupling of power between the two eigenmodes, the magnitude of the force and the position of the coupling point can then be determined using ‘white‐light interferometric’ techniques.
JLA Vol:15 Iss:4 (Design and performance of multilevel phase fan-out diffractive optical elements for laser materials processing)
Itami R&D Laboratories, Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, Japan
A multilevel phase fan-out diffractive optical element (DOE) has been developed and introduced into various kinds of laser materials processing such as drilling, cutting, welding, and soldering. The larger the number of arrayed spots the DOE generates on the surface of the workpiece, the more sensitive the intensity uniformity of the spots becomes to fabrication errors, which are deviations between designed and fabric...
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
STMicroelectronics, 16 rue Pierre et Marie Curie, BP 7155, F-37071 Tours Cedex2, France
GREMI-UMR 7344, CNRS/Universite´ d'Orle´ans, 14 rue d'Issoudun, BP 6744, F-45067 Orle´ans cedex 2, France
This paper investigates laser dicing of glass (commercial Borofloat
Dipartimento di Meccanica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, Italy
The present paper is a contribution to the definition of optimal laser hardening conditions with production rate as the main goal. When the part to be treated is given, the optimization problem can be expressed in terms of minimal execution time subjected to two constraints: the depth of treatment and hardness of transformed layer. When the analytical expression of the objective function and the constraints was determined, the feasibility area was described and analyzed. Finally, an optimization algorithm was applied to identify the optimal solut...
JLA Vol:9 Iss:5 (Experimental development of a machining database for the CO<sub>2</sub> laser cutting of ceramic tile)
S. A. J. Livingstone
K. L. Chua
Department of Mechanical and Chemical Engineering, Heriot‐Watt University, Riccarton, Edinburgh EH14 4AS, U.K.
This paper covers the cutting of commercially‐available ceramic tiles using a CO2 laser cutting machine, with the object of producing a laser beam machining database which contains the essential parameter information for their successful processing. Various laser cutting parameters were investigated that would generate a cut in ceramic tile which required minimal posttreatment. The effects of various shield gases, multipass cutting and underwater cutting were also examined.
Mary H. McCay
T. Dwayne McCay
Narendra B. Dahotre
C. Michael Sharp
Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388
Metal matrix composites continue to be desirable structural materials but difficulties in joining limit their usefulness. This paper describes the results of a study on the laser welding of A356‐AI/SiC particulate composites. Three separate processing regimes are identified based upon analytical model predictions and metallographic analysis of the solidification structures.
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