JLA Vol:23 Iss:3 (X-ray investigation of melt flow behavior under magnetic stirring regime in laser beam welding of aluminum)
Authors:
M. Gatzen
Z. Tang
F. Vollertsen
BIAS-Bremer Institut fu¨r angewandte Strahltechnik GmbH, Klagenfurter Str. 2, D-28359 Bremen, Germany
M. Mizutani
S. Katayama
JWRI Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, JapanThe use of magnetic fields to influence weld bead shape and dilution in laser welding of aluminum alloys was recently suggested. It was already demonstrated for the case of laser welding of hot-cracking sensitive aluminum alloys with silicon-containing filler wire that applying alternating magnetic fields has an impact on the dilution of silicon in ...
$25.00
JLA Vol:23 Iss:4 (Direct manufacturing of net-shape functional components/test-pieces for aerospace, automotive, and other applications)
Authors:
Lijue Xue
Yangsheng Li
Shaodong WangLaser consolidation (LC) is a novel computer-aided manufacturing process being developed by the Industrial Materials Institute of National Research Council of Canada (NRC-IMI). This rapid manufacturing process produces net-shape functional metallic parts layer-by-layer directly from a computer-aided design (CAD) model by using a laser beam to melt the injected powder and resolidifying it on the substrate or previous layer. As an alternative to the conventional machining process, this novel manufacturing process builds net-shape functional parts or features on an existing part by adding instead of removing materia...
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JLA Vol:23 Iss:4 (Evaluation of the bone repair in defects grafted with hydroxyapatite and collagen membrane combined with laser therapy in rats)
Authors:
Marcelo Rodrigues da Cunha
Luanda de Abreu Figueira
Joa˜o Paulo Mardegan Issa
Ricardo Alexandre Junqueira Calzzani
Daniele Cristina do Prado Ribeiro
Amilton Iatecola
Mariane Silva Pettian
ArrayBone regeneration is the result of cellular events such as osteogenesis and neovascularization. However, implantation of autogenous grafts may be necessary in cases of bone mass loss due to high impact trauma. The disadvantages of the latter approach include morbidity of the donor area. Biomaterials represent an alternative for bone restoration. The most widely used compounds are collagen or hydroxyapat...
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JLA Vol:23 Iss:4 (Femtosecond laser machined microfluidic devices for imaging of cells during chemotaxis)
Authors:
L. Costa
A. Terekhov
D. Rajput
W. Hofmeister
Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388
D. Jowhar
G. Wright
Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37240
C. Janetopoulos
Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37240 and Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee 37240Microfluidic devices designed for chemotaxis assays were fabricated on fused silica substrates using femtosecond laser micromachining. These devices hav...
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JLA Vol:23 Iss:4 (Heat affected zones and oxidation marks in fiber laser–oxygen cutting of mild steel)
Authors:
S. O. Al-Mashikhi
Salalah College of Technology, Engineering Department, Salalah, Oman and Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
J. Powell
A. Kaplan
Lulea University of Technology, Department of Applied Physics and Mechanical Engineering, SE 971 87 Lulea, Sweden
K. T. Voisey
Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United KingdomThe effect of cutting speed and sheet thickness on surface oxidation and heat affected zones (HAZs) has been investigated for laser–oxygen cutting of mild steel sheet with a fiber laser. Optical and scanning ele...
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JLA Vol:23 Iss:4 (Influence of the beam profile formulation when modeling fiber-guided laser welding)
Authors:
Alexander F. H. Kaplan
Department of Engineering Sciences and Mathematics, Luleå University of Technology,SE-971 87 Luleå, SwedenDuring deep penetration laser welding, the focused laser beam determines the vapor capillary, called keyhole, and in turn the whole process physics. Beside spot diameter and Rayleigh length, the beam profile is another important but hardly explored part of the focused laser beam. The focusing of fiber-guided Yb:fiber, Nd:YAG or diode laser beams creates the complex situation that the beam has a top-hat profile in the focal plane but toward the far field transforms to a Gaussian beam. Such power density distribution was measured for a fo...
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JLA Vol:23 Iss:4 (Investigation of the effect of irradiance and pulse duration in industrial percussion laser-drilling of Waspaloy)
Authors:
Robin Bright
Harris L. Marcus
Institute of Materials Science and the Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269-3136As the use of pulsed lasers in the manufacture of cooling holes in high-temperature gas-turbine engine components continues to increase, understanding the material behavior during laser-material interaction and the subsequent effects on hole quality becomes critical. In this study, atomic emission spectroscopy is used to monitor the optical characteristics of ejected material during percussion laser-drilling of Waspaloy over irradiance and pulse duration values in the ranges...
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JLA Vol:23 Iss:4 (Thermal diffusivity measurement of silver nanofluid by thermal lens technique)
Authors:
Reza Zamiri
Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
B. Z. Azmi
Department of Physics,Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia and Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
E. Shahriari
Kazim Naghavi
E. Saion
Zahid Rizwan
M. S. Husin
Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, MalaysiaThe thermal lens technique was utilized in silver nanofluid containing silver nanopartic...
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JLA Vol:24 Iss:1 (Fabrication of microtransmittance grating using laser induced backside dry etching)
Authors:
He Chao
Liu Furong
Zhou Weiping
Chen Jimin
Institute of Laser Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, ChinaLaser induced backside dry etching (LIBDE) is a novel technique, which applied in the micromachining and nanomachining of transparent dielectric materials used for optical elements by direct laser irradiation with the assistance of solid mediums as an absorbed layer. On the basis of exploring two different solid mediums, i.e. Al2O3 powder and alumina ceramic wafer as absorbers, LIBDE with 1064 nm central wavelength pulsed ytterbium doped fiber laser as the irradiation ...
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JLA Vol:24 Iss:1 (Hazard class downscaling of a class 4 retina safe laser)
Authors:
Jed A. Simmons
Alan B. Marchant
Energy Dynamics Laboratory, North Logan, Utah 84341A class 4 pulsed laser can be operated in a safe regime without reducing instantaneous irradiance or pulse energy by shortening its dwell time through duty cycle reduction or scanning. A conservative relationship for hazard distance as a function of scan rate is derived for the case of a scanning, retina safe laser.
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