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:3 (Laser cladding with scanning optics: Effect of power adjustment)

Authors:
Joonas Pekkarinen
Veli Kujanpa¨a¨
Antti Salminen
Laboratory of Laser Processing, Department of Mechanical Engineering, Lappeenranta University of Technology, Tuotantokatu 2, 53850 Lappeenranta, Finland

Laser cladding with fiber laser using scanning optics is a relatively new way of laser cladding. Modern oscillating scanners enable laser power adjustment according to scanning direction. This is a versatile tool for making process more stable as well as modifying the shape of clad bead. Laser cladding was made using 5 kW IPG fiber laser with ILV-oscillating scanner, using 316L powder as clad material and S355 mild steel plate as substrate mate...

JLA Vol:24 Iss:3 (Laser cladding for railway repair and preventative maintenance)

Authors:
Adam Clare
Olusola Oyelola
Janet Folkes
Peter Farayibi
Innovative Manufacturing Processes Group, Manufacturing Division, Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom

Rolling contact fatigue, amongst other mechanisms of wear, between railway track and train wheel ensures that periodic replacement of worn track and other key components such as switches must be undertaken. The cost associated with repairing/replacing track is significant. This places a financial burden upon the rail network provider, creates a significant carbon footprint associated with remanufacture of track, an...

JLA Vol:24 Iss:3 (Contributing factors to fires in clinical settings during medical laser applications)

Authors:
J. Pierce
S. Lacey
R. Lopez
J. Lippert
J. Franke
Environmental and Occupational Health Sciences, University of Illinois at Chicago, 2121 W. Taylor Street—MC 922, Chicago, Illinois 60612

An estimated 650 fires occur in the surgical environment annually in the U.S.; a figure which may be severely underreported. Any fire in the surgical environment can have devastating implications for patient safety and is clearly an occupational risk to healthcare personnel. Literature searches of the PubMed and Rockwell Laser Industries Laser Accident Databases were performed in order to (1) identify factors and sources affecting the r...

JLA Vol:24 Iss:3 (Quality detection and control during laser cutting progress with coaxial visual monitoring)

Authors:
Peng Wen
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China

Yongqiang Zhang
Shougang Research Institute of Technology, Beijing 100043, People’s Republic of China

Wuzhu Chen
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China

A system of coaxial visual detection and closed-loop control is developed in laser cutting to automatically optimize cutting speed to obtain best cutting quality. The sparks behavior is observed under different cutting speeds by side visual monitoring. It is proved that the maximum number of pix...

JLA Vol:24 Iss:3 (Trepanning drilling of microholes on cemented tungsten carbide using femtosecond laser pulses)

Authors:
Khai Xuan Pham
Rie Tanabe
Yoshiro Ito
Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan

Microholes of 100–300 µm diameters were trepanned on cemented tungsten carbide plates of 0.5 and 1 mm thicknesses by means of femtosecond laser pulses using a galvano-scanner with an f-θ lens of 80 mm focal length. It was found that the focus position of the laser beam relative to the sample surface affects the drilled hole shape and drilling speed. Focus on the surface produced a less tapered hole and a higher machining speed than focus 0.5 mm away from the surfa...

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...

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:4 (EDITORIAL)

Authors:
Andreas Ostendorf