JLA Vol:25 Iss:3 (Random testing reveals excessive power in commercial laser pointers)
Authors:
Joshua Hadler
Quantum Electronics and Photonics Division, NIST, Boulder, Colorado 80305
Edna Tobares
Office of Safety, Health and Environment, NIST, Gaithersburg, Maryland 20899
Marla Dowell
Quantum Electronics and Photonics Division, NIST, Boulder, Colorado 80305In random testing of 122 commercial laser pointers, the authors observed that 90% of green pointers and 44% of red pointers were not in compliance with the Code of Federal Regulations (CFR), producing laser power in excess of the CFR-allowed limit at one or more laser wavelengths. The measurement results are presented and the authors describe the inexpensive test bed they ...
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JLA Vol:25 Iss:3 (Surface pore initiated fatigue failure in laser clad components)
Authors:
M. M. Alam
J. Powell
A. F. H. Kaplan
Department of Engineering Science and Mathematics, Luleå University of Technology, SE-971 87 Luleå, Sweden
J. Tuominen
P. Vuoristo
Department of Materials Science, Tampere University of Technology, FI-33101 Tampere, Finland
J. Miettinen
J. Poutala
Department of Mechanics and Design, Tampere University of Technology, FI-33101 Tampere, Finland
J. Na¨kki
Department of Materials Science, Tampere University of Technology, FI-33101 Tampere, Finland and Technology Centre KETEK Ltd, FI-67100 Kokkola, Finland
J. Junkala$25.00
JLA Vol:25 Iss:3 (Surface tension stabilized laser welding (donut laser welding)—A new laser welding technique)
Authors:
Peter Haglund
Department of Engineering Sciences and Mathematics, Luleå University of Technology and Westinghouse Electric Sweden AB, SE-721 63 Va¨sterås, Sweden
Ingemar Eriksson
John Powell
Alexander Kaplan
Department of Engineering Sciences and Mathematics, Luleå University of TechnologyA new laser welding process is presented which delivers a porosity free, spatter free weld. The process involves a donut shaped melt with a central hole of the same order of magnitude as the material thickness. The laser illuminates only the leading section of this melt. The hole is kept open by the melt surface tension.
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JLA Vol:25 Iss:3 (The effect of fit-up geometry on melt flow and weld quality in laser hybrid welding)
Authors:
J. Lamas
Centro Tecnolo´xico do Naval Galego, Ferrol 15590 (A Corun˜a), Spain and Department of TVM, Luleå University of Technology, S-971 87 Luleå, Sweden
J. Karlsson
P. Norman
J. Powell
A. F. H. Kaplan
Department of TVM, Luleå University of Technology, S-971 87 Luleå, Sweden
A. Yan˜ez
Centro de Investigacio´ns Tecnolo´xicas, Universidade da Corun˜a, Ferrol 15403 (A Corun˜a), SpainHybrid laser-arc welding has a good tolerance to poor fit up as compared to simple laser welding. For a butt joint, the joint fit-up variations can b...
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JLA Vol:25 Iss:3 (The influence of position in overlap joints of Mg and Al alloys on microstructure and hardness of laser welds)
Authors:
S. Bannour
Unite´ de Thermique et Thermodynamique des Proce´de´s Industriels, Ecole Nationale d'Inge´nieurs de Monastir, Avenue Ibn Jazzar, 5019 Monastir, Tunisia and Institut de Me´canique de Marseille, Laboratoire IUSTI, UMR CNRS 6595, Universite´ de la Me´diterrane´e—Aix-Marseille Universite´, Technopoˆle de Chaˆteau- Gombert, 60 rue Joliot Curie, 13453 Marseille Cedex 13, France
K. Abderrazak
Unite´ de Thermique et Thermodynamique des Proce´de´s Industriels, Ecole Nationale d'Inge´nieurs de Monastir, Avenue Ibn Jazzar, 5019 Monastir, Tunisia
S. Mattei$25.00
JLA Vol:25 Iss:3 (Weldability and keyhole behavior of Zn-coated steel in remote welding using disk laser with scanner head)
Authors:
Su-Jin Lee
Seiji Katayama
Yousuke Kawahito
Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
Keisuke Kinoshita
Vehicle Production Engineering Division, Nissan Motor Co., Ltd., 560-2 Okatsukoku, Atsugi-shi, Kanagawa 243-0192, Japan
Jong-Do Kim
Division of Marine Engineering, Korea Maritime University, Yeongdo-gu, Busan 606-791, South KoreaZinc-coated steels are widely used in automobile bodies. Laser welding, which offers a lot of advantages over the conventional welding with metal active gas welding, CO2 arc, etc. in terms of improved weld q...
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