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), Spain

Hybrid 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...

JLA Vol:24 Iss:2 (Energetic efficiency of remote cutting in comparison to conventional fusion cutting)

Authors:
M. Lu¨tke
J. Hauptmann
A. Wetzig
Fraunhofer IWS, Winterbergstraße 28, 01277 Dresden, Germany

E. Beyer
Fraunhofer IWS, Winterbergstraße 28, 01277 Dresden, Germany and University of Technology Dresden, 01062 Dresden, Germany

The remote cutting technique provides an enormous potential in terms of cutting speeds when working on thin sheets. Even on contour cutting speeds about 100 m/min are realizable. Working without any cutting gas, the material of the cutting kerf must be vaporized partially. It is evident that the energy input must be higher than for pure melting of the cutting kerf’s material. In order to ...

JLA Vol:6 Iss:4 (Hazardous chemicals produced by laser materials processing)

Authors:
John M. Kokosa
GMI Engineering & Management Institute, Flint, MI, U.S.A.

Despite evidence to the contrary, until recently many laser operators believed, or at least stated, that the only chemical by‐products of laser processing of any consequence were water and CO₂. During the last eight years, especially, several investigations have shown that hazardous materials are produced when cutting or welding nearly all substrates. In the following paper, the major chemical hazards associated with processing metals, inorganics, biomaterials, and polymers are outlined.

JLA Vol:16 Iss:1 (Laser-assisted chemical cleaning for oxide-scale removal from carbon steel surfaces)

Authors:
Hyunkyu Lim
Dongsik Kim
Department of Mechanical Engineering, POSTECH, Pohang 790-784, Korea

The article introduces a novel laser chemical processing technique for removing thin oxide layers on low-carbon steel surfaces by combining laser-induced shock waves and the chemical cleaning technique that is currently utilized in the conventional oxide-scale removal. A Q-switched Nd:yttritium–aluminum–garnet laser (wavelength 1064 nm, full width at half maximum 6 ns) induces optical breakdown in the acid solution, producing intense pressure waves which act as a noncontact scale breaker. It has been demonstrated that the novel process leads to substa...

JLA Vol:20 Iss:2 (<em>In vivo</em> and <em>in vitro</em> evaluation of the corneal damage induced by 1573&ensp;nm laser radiation)

Authors:
Daniel Courant
Catherine Chapel
Ce´line Billy
Service de Radiobiologie et d’Oncologie, IRCM-DSV, Commissariat à l’Energie Atomique, BP 6, Fontenay aux roses, 92265, France

Nicole Salès
Service d’Immuno-Virologie, IMETI-DSV, Commissariat à l’Energie Atomique, BP 6, Fontenay aux roses, 92265, France

Jean-Claude Pe´rot
Christophe Pothier
Lasers Optique et Thermique, CEP, Direction des Centres d’Essai et d’Expertise, 16bis avenue Prieur de la Cŏte d’Or, 94114, Arcueil, France

This study involved the corneal effects of t...

JLA Vol:8 Iss:5 (Taking advantage of laser properties to enhance demonstrations and student laboratories)

Authors:
Michele L. Brill
Camden County College — Physics/Lasers, Box 200, Blackwood, NJ 08012, U.S.A.

This paper reflects the proceedings of a workshop for local educators provided by Camden County College Laser Curriculum faculty which addressed the question: ‘How can the teacher take advantage of laser properties to improve or enhance demonstrations and student labs?’ Explored here are illustrative ways in which to utilize, for educational purposes, the three well&hyphen;known characteristics of lasers: directionality, monochromaticity, and coherence. There is a faculty overlap between the Physics Department and the Laser Curriculum faculty at the college. The use...

JLA Vol:2 Iss:1 (Laser Laparoscopy Contamination)

Authors:
Douglas E. Ott
420 Charter Blvd. Macon, Georgia 31210

JLA Vol:14 Iss:2 (Thermomechanical effects in laser microprocessing for dieless metal wire drawing)

Authors:
Yonggang Li
School of Optic/CREOL (Center for Research and Education of Optics and Lasers), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida, 32816-2700

Nathaniel R. Quick
USF Filtration and Separations Group, Inc., 1750 Filter Drive, DeLand, Florida 32724-2045

Aravinda Kar
School of Optic/CREOL (Center for Research and Education of Optics and Lasers), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida, 32816-2700

A new dieless metal fiber drawing process is developed in which a high-precision laser is used to heat the...

JLA Vol:18 Iss:3 (Thermal and microstructural aspects of the laser direct metal deposition of waspaloy)

Authors:
Andrew J. Pinkerton
Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom

Mallikarjun Karadge
Manchester Materials Science Centre, School of Materials, The University of Manchester, Grosvenor Street, Manchester M1 7HS, United Kingdom

Waheed Ul Haq Syed
Lin Li
Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom

A potential problem in applying the laser direct metal deposition (LDMD) technique to the f...

JLA Vol:26 Iss:1 (Periodic antireflection surface structure fabricated on silicon by four-beam laser interference lithography)

Authors:
Z. Zhang
CNM and JR3CN, Changchun University of Science and Technology, Changchun 130022, China and CHO, Changchun Observatory, National Astronomical Observatory, CAS, Changchun 130117, China

Z. Wang
D. Wang
CNM and JR3CN, Changchun University of Science and Technology, Changchun 130022, China and JR3CN, University of Bedfordshire, Luton LU1 3JU, United Kingdom

Y. Ding
CNM and JR3CN, Changchun University of Science and Technology, Changchun 130022, China

Silicon surface structures with excellent antireflection property arouse wide interest. Chemical and physical methods such as femtosecond, nanosecond, and picosecond la...