JLA Vol:24 Iss:1 (Possible explanations for different surface quality in laser cutting with 1 and 10 μm beams)
Authors:
Koji Hirano
PIMM Laboratory (Arts et Me´tiers ParisTech-CNRS), 151 Boulevard de l’Hoˆpital 75013 Paris, France and Nippon Steel Corporation, Marunouchi Park Building, 2-6-1 Marunouchi, Chiyoda Ward, Tokyo 100-8071, Japan
Remy Fabbro
PIMM Laboratory (Arts et Me´tiers ParisTech-CNRS), 151 Boulevard de l’Hoˆpital 75013 Paris, FranceIn laser cutting of thick steel sheets, quality difference is observed between cut surfaces obtained with 1 and 10 μm laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength dependence. First, striation generation process is descri...
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JLA Vol:24 Iss:1 (Ultra-high speed disk laser cutting of carbon fiber reinforced plastics)
Authors:
Kwang-Woon Jung
Yousuke Kawahito
Seiji Katayama
Joining and Welding Research Institute (JWRI), Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, JapanLaser cutting of carbon fiber reinforced plastics (CFRPs) has been known to be difficult due to the thermal damage to CFRP material. Therefore, with the objectives of evaluating the cutting possibility for long- or short-fiber pellet CFRP sheets of 3 mm in thickness and obtaining narrower heat affected zone (HAZ) for better cut quality, ultra-high speed cutting was conducted by using a continuous-wave high brightness disk laser. The increase in the laser power rendered the cutting time shorter...
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JLA Vol:24 Iss:2 (Synthesis of nitrogen-doped diamond films using vibrational excitation of ammonia molecules in laser-assisted combustion flames)
Authors:
L. S. Fan
Z. Q. Xie
J. B. Park
X. N. He
Y. S. Zhou
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511
L. Jiang
Department of Mechanical and Automation Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
Y. F. Lu
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511Nitrogen-doped diamond was synthesized in open air using laser-assisted combustion flame method. A wavelength-tunable CO2 laser was used to resonantly excite the vibration mod...
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JLA Vol:24 Iss:2 (Laser dressing of metal bonded diamond blades for cutting of hard brittle materials)
Authors:
Philipp von Witzendorff
Anas Moalem
Rainer Kling
Ludger Overmeyer
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, GermanyIn this study, the authors investigate the laser dressing of metal bonded diamond blades by means of laser pulses with different pulse durations and wavelengths. Conventional dressing suffers from excessive blade wear, whereas laser dressing enables precise removal of the bonding metal to generate the required chip space of protruding diamond grains. The challenge for processing this composite material is to find appropriate level of ablation for the bonding metal without damaging the diamond grains thr...
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JLA Vol:24 Iss:2 (Laser ablation of polyetheretherketone films for reversible wafer bonding)
Authors:
Lauren E. S. Rohwer
James E. Martin
Thomas A. Friedmann
Sandia National Laboratories, P.O. Box 5800, MS1425, Albuquerque, New Mexico 87185-1425
John Heck
Intel Corporation, M/S SC9-09, 2200 Mission College Blvd., Santa Clara, California 95054A reversible wafer bonding method has been developed that enables high-temperature processing of thinned silicon wafers. The silicon wafers are bonded to Pyrex carriers using a polyetheretherketone (PEEK) film, which melts at 343 °C, and provides a very strong bond. Debonding is accomplished by UV laser ablation through the Pyrex carrier and can be facilitated by coating the Pyrex wafer...
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JLA Vol:24 Iss:2 (Weld strength of laser-welded hot-press-forming steel)
Authors:
Minjung Kang
Cheolhee Kim
Welding and Joining Research Group, Korea Institute of Industrial Technology, 7–47, Songdo-Dong, Yeonsu-Gu, Incheon 406–840, Republic of Korea
Jongsup Lee
Molding and Forming Technology R&D Group, Korea Institute of Industrial Technology, 7–47, Songdo-Dong, Yeonsu-Gu, Incheon 406–840, Republic of KoreaThere is an increasing demand for ultrahigh-strength steel in automotive industries to facilitate the manufacture of lightweight vehicles without compromising their security features. Although transformation-induced plasticity and dual phase steels have strengths of under 1 GPa, boron-alloy...
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JLA Vol:24 Iss:2 (Laser induced backside wet and dry etching of solar glass by short pulse ytterbium fiber laser irradiation)
Authors:
He Chao
Liu Furong
Wang Min
Yuan Jianwen
Chen Jimin
Institute of Laser Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, ChinaMicrostructures fabricated on the surface of solar glass have the potential to improve the performance of solar cells. In this paper, in order to overcome the high transmittance to 1064 nm center wavelength fiber laser irradiation and realize high efficiency process on transparent glass substrates, different absorber materials, including alumina powder, alumina ceramic wafers, and copper sulphate solutions, were applied for dry and wet etching under the irradiation of ...
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JLA Vol:24 Iss:2 (Temperature measurement of laser heated metals in highly oxidizing environment using 2D single-band and spectral pyrometry)
Authors:
Maryse Muller
Remy Fabbro
PIMM Laboratory (Arts et Me´tiers ParisTech—CNRS), 151 Bd.de l’Hoˆpital, 75013 Paris, France
Hazem El-Rabii
Institut Prime, CNRS-ENSMA-Universite´ de Poitiers, 1 Ave. Cle´ment Ader, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France
Koji Hirano
Nippon Steel Corporation, Marunouchi Park Building, 2-6-1 Marunouchi, Chiyoda Ward, Tokyo 100-8071, JapanCalibration and validation of two temperature measurement techniques both using optical pyrometry, usable in the framework of the study of the heated metals in highly oxidizing environments and more generally dur...
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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, GermanyThe 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 ...
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JLA Vol:24 Iss:3 (Stability limits of laser drilled hole arrays on large areas)
Authors:
Nelli Hambach
Claudia Hartmann
Jens Holtkamp
Arnold Gillner
Fraunhofer Institute for Laser Technology ILT, Steinbachstr. 15, D-52074 Aachen, GermanyLarge area microdrilling utilizing short pulsed solid state lasers is a promising manufacturing technique for filtration technology. High degree of perforation and high quality of the drilled hole arrays regarding roundness and diameter variation of holes are the main challenges. The goal is to achieve a high degree of perforation with a high number of round holes on a constant pitch. The resulting variation of hole roundness and mechanical stability limitations of the percussion drilled foi...
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