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 Korea

There 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...

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, China

Microstructures 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 ...

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, Japan

Calibration 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...

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: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, Germany

Large 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...

JLA Vol:24 Iss:3 (Optimization of the aluminum oxide properties for adhesive bonding by laser surface pretreatment)

Authors:
Rico Rechner
Institute of Surface and Manufacturing Technology, Technische Universita¨t Dresden, D-01069 Dresden, Germany

Irene Jansen
Fraunhofer Institute for Material and Beam Technology, D-01277 Dresden, Germany

Eckhard Beyer
Institute of Surface and Manufacturing Technology, Technische Universita¨t Dresden, D-01069 Dresden, Germany and Fraunhofer Institute for Material and Beam Technology, D-01277 Dresden, Germany

The laser pretreatment of AlMg3 has been conducted to investigate the influence of the fluence on the oxide properties. Therefore, the aluminum surface is pretreated by a fiber laser and subsequently analyzed b...

JLA Vol:24 Iss:4 (EDITORIAL)

Authors:
Andreas Ostendorf

JLA Vol:24 Iss:3 (Investigation of the effects of basic laser material interaction parameters in laser welding)

Authors:
W. J. Suder
S. W. Williams
Welding Engineering and Laser Processing Centre, Cranfield University, MK43 0AL, United Kingdom

The depth of penetration achieved in continuous wave (CW) laser welding results from a balance of many complicated phenomena, which are linked with the characteristics of the heat source. In this work, the laser welding process has been investigated in terms of basic laser material interaction parameters: power density and interaction time. It has been shown that these two parameters are insufficient to characterize the laser welding process. Thus, a third parameter, specific point energy, has been introduced, which along with the power densi...

JLA Vol:24 Iss:3 (Laser hole sealing of commercially pure grade 1 titanium)

Authors:
Y. D. Huang
National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, People’s Republic of China; Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L3G1, Canada; and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, People’s Republic of China

A. Pequegnat
M. I. Khan
Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L3G1, Canada

J. C. Feng
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin...

JLA Vol:24 Iss:3 (2D longitudinal modeling of heat transfer and fluid flow during multilayered direct laser metal deposition process)

Authors:
Simon Morville
Muriel Carin
LIMATB, Universite´ de Bretagne-Sud/UEB, Centre de recherche Ch. Huygens, Rue de Saint Maude´, BP 92116, 56321 Lorient cedex, France

Patrice Peyre
Myriam Gharbi
PIMM, UMR 8006 CNRS-Arts et Me´tiers Paris Tech, 151 Boulevard de l’Hoˆpital, 75013 Paris, France

Denis Carron
Philippe Le Masson
LIMATB, Universite´ de Bretagne-Sud/UEB, Centre de recherche Ch. Huygens, Rue de Saint Maude´, BP 92116, 56321 Lorient cedex, France

Re´my Fabbro
PIMM, UMR 8006 CNRS-Arts et Me´tiers Paris Tech, 151 Boulevard de l’Ho&ci...