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JLA Vol:15 Iss:1 (Melting characteristics of metals by combined laser beams with different wavelengths)
Authors:
Jong Hyun Moon
Graduate School of Osaka University, Suitasi, Osaka 565-0871, Japan
Masami Mizutani
Seiji Katayama
Akira Matsunawa
Joining and Welding Research Institute, Osaka University 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, JapanInfrared CO2 and yttritium–aluminum–garnet (YAG) lasers have great difficulty in melting metals such as pure aluminum and copper possessing high reflectivity and high thermal and electrical conductivity. On the other hand, the laser absorptance of such metals generally increases with the decrease in the wavelength, and thus the application of laser with higher power and shorte...
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JLA Vol:15 Iss:1 (Microstructure and corrosion behavior of high power diode laser deposited Inconel 625 coatings)
Authors:
J. Tuominen
Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland
P. Vuoristo
T. Ma¨ntyla¨
Institute of Materials Science, Tampere University of Technology, FIN-33101 Tampere, Finland
J. Latokartano
J. Vihinen
Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland
P. H. Andersson
Institute of Production Engineering, Tampere University of Technology, FIN-33101 Tampere, FinlandA series of experiments were performed to investigate the one-step laser cladding of Inconel 625 powder, injected off-axially onto m...
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JLA Vol:15 Iss:1 (Specific energy for pulsed laser rock drilling)
Authors:
Z. Xu
C. B. Reed
G. Konercki
Technology Development Division, Argonne National Laboratory, Argonne, Illinois 60540
R. A. Parker
Parker Geoscience Consulting, LLC, Arvada, Colorado 80403
B. C. Gahan
Gas Technology Institute, Des Plains, Illinois 60018
S. Batarseh
R. M. Graves
Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401
H. Figueroa
Petroleos de Venezuela INTEVEP, S.A., Caracas 1070A, Venezuela
N. Skinner
Halliburton Energy Service, Carrollton, Texas 75006Application of advanced high power ...
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JLA Vol:15 Iss:2 (Antigalling and low friction properties of a laser processed Co-based material)
Authors:
D. H. E. Persson
Duroc AB, Umeå, Sweden
S. Jacobson
S. Hogmark
The Tribomaterials Group at Ångstro¨m Laboratory, Uppsala University, SwedenThe antigalling and low friction properties of a CO2-laser processed Co-based material (Stellite 21) was investigated under high-load sliding conditions. Dry sliding tests were carried out at both room temperature and at 250 °C. The tests were performed by sliding two identical specimens against each other in a dedicated test. A low and stable friction coefficient at a level of about 0.20, and relatively independent on load and sliding speed, was obtained after a short runn...
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JLA Vol:15 Iss:2 (Automatic detection of lack of fusion defects in CO<sub>2</sub> laser gear welding)
Authors:
A. Ghasempoor
Department of Mechanical, Aerospace, and Industrial Engineering, Ryerson University, Toronto, Ontario M5B 2K3, Canada
P. Wild
M. Auger
Department of Mechanical Engineering, Queen’s University, Kingston, Ontario K7K 3N6, Canada
R. Mueller
Powerlasers Ltd., Advanced Technologies Centre, Kitchener, Ontario N2G 2Y5, CanadaLaser welding is becoming increasingly important in the automotive industry and quality of the weld is critical for a successful application. In many cases the increase in welding speed provided by laser welding has resulted in the need for an automated, on-line weld monitoring system....
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JLA Vol:15 Iss:2 (Characteristics of high-power diode–laser welds for industrial assembly)
Authors:
C. A. Walsh
H. K. D. H. Bhadeshia
Department of Materials Science and Metallurgy, University of Cambridge, United Kingdom
A. Lau
B. Matthias
R. Oesterlein
ABB Corporation Research, Ladenburg, Germany
J. Drechsel
Laserinstitut Mittelsachsen e.V., Mittweida, GermanyRecent progress in available beam power and beam quality has meant that high power diode lasers may soon become prime tools for welding in many assembly applications in industrial production. Their compact size and low weight makes them particularly suitable for use in conjunction with robotic control. The advantages of laser welding ...
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JLA Vol:15 Iss:2 (Copper vapor laser micromachining of 304 stainless steel)
Authors:
M. El-Bandrawy
K. Nagarathnam
Mool C. Gupta
Applied Research Center, College of Engineering and Technology, Old Dominion University, Newport News, Virginia 23606
C. Hamann
J. Horsting
Siemens Automotive, Newport News, Virginia 23606A copper vapor laser (CVL) of 511/578 nm wavelength, 25 ns pulse width, and 10 kHz repetition rate combined with a computer controlled galvo head was used for laser micromachining of 304 stainless steel. The objective of this study was to develop the CVL micromachining process and its optimization. We observed a significant improvement in micromachining quality with a spatially filtered ...
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JLA Vol:15 Iss:2 (Corrosion resistance of laser-fabricated metal–matrix composite layer on stainless steel 316L)
Authors:
K. H. Lo
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
C. T. Kwok
Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Taipei, Macau, China
F. T. Cheng
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
H. C. Man
Department of Manufacturing Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, ChinaLaser fabrication of ceramic-reinforced metal–matrix composite (MMC) layer on stainless steel 316L was achieved by a two-st...
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JLA Vol:15 Iss:2 (Critical parameters of light emitting diodes and their implications on the optical radiation safety limits according to IEC 60825-1 +Amendment 2)
Authors:
W. Horak
R. Neuhaus
Siemens AG, 81730 Munich, GermanyRadiation power and image size of the source on the viewer's retina (apparent source) determines the hazard for the eye. Following IEC 60825-1, the effective emission limits are dependent on the tabulated accessible emission limits and the assigned measurement conditions—both depending on the source size. In the case of a light emitting diode (LED), this emitting area is not only determined by the chip size but also by the housing—due to built-in lenses, reflectors, and scattering materials. Also the virtual source position will be distorted by the integrated lenses. Since the measurement distance ...
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JLA Vol:15 Iss:2 (Laser forming of thin foil by a newly developed sample holding method)
Authors:
Shunro Yoshioka
Toshiyuki Miyazaki
Tadashi Misu
Ryugo Oba
Masatoshi Saito
Chiba Institute of Technology, Tsudanuma, Narashino-shi, Chiba 275-0016, JapanA sample holding method is newly developed for laser forming, in which the target material is held between two transparent plates. During laser beam scanning on the target, the target foil is kept flat. After the scanning is finished, the foil is detached from the holder; the foil bends toward the beam scanned surface. Experiments are carried out with a Nd:yttrium–aluminum–garnet laser beam for a spot size of 25μm and for a traverse speed of 10 mm/s. A bending...
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