JLA Vol:24 Iss:5 (<em>Quo vadis</em>, laser additive manufacturing?)

Authors:
Ingomar Kelbassa
Fraunhofer Institute for Laser Technology ILT, Steinbachstrasse 15, 52074 Aachen, Germany and Chair for Laser Technology LLT, RWTH Aachen University, Steinbachstrasse 15, 52074 Aachen, Germany

Terry Wohlers
Tim Caffrey
Wohlers Associates, Inc., OakRidge Business Park, 1511 River Oak Drive, Fort Collins, Colorado 80525

JLA Vol:24 Iss:5 (A comparative study of cut front profiles and absorptivity behavior for disk and CO₂ laser beam inert gas fusion cutting)

Authors:
Leonardo Daniele Scintilla
Luigi Tricarico
Dipartimento di Meccanica, Matematica e Management (DMMM), Politecnico di Bari, Viale Japigia, 182–70126 Bari, Italy

Achim Mahrle
Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

Andreas Wetzig
Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

Eckhard Beyer
Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dres...

JLA Vol:24 Iss:5 (Development of new processes for welding of thermal Al&ndash;Cu solar absorbers using diode lasers)

Authors:
Andre Springer
Peter Kallage
Michael Hustedt
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Stephan Barcikowski
University of Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 5–7, 45141 Essen, Germany

Volker Wesling
Heinz Haferkamp
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Flat-plate solar collectors are favorable devices to generate heat from the energy of the Sun. The central part of a collector, the solar absorber, is a front-coated aluminum sheet with a copper tube fixed on the back side in order to transport heated liquid. ...

JLA Vol:24 Iss:5 (Flexible and efficient laser remote welding of ultra-thin metal foils)

Authors:
Andreas Patschger
Jens Bliedtner
University of Applied Science Jena, Carl-Zeiss-Promenade 2, Jena 07745, Germany

Matthias Hild
JENOPTIK Automatisierungstechnik GmbH, Konrad-Zuse-Straße 6, Jena 07745, Germany

Jean Pierre Bergmann
University of Technology Ilmenau, Neuhaus 1, Ilmenau 98693, Germany

This paper discusses investigations regarding flexible and efficient strategies of laser remote welding of ultra-thin metal foils (≤50 μm) which are applied in the fields of electronics, packaging, and construction. A single-mode fiber laser was used, equipped with a scanner head and diverse objectives. Thus...

JLA Vol:24 Iss:5 (Laser cladding using scanning optics)

Authors:
I. J. Pekkarinen
V. Kujanpa¨a¨
A. Salminen
Laboratory of Laser Processing, Department of Mechanical Engineering, Lappeenranta University of Technology, Tuotantokatu 2, 53850 Lappeenranta, Finland

Laser cladding using scanning optics is a relatively little studied matter. Scanning optics makes the adjustment of laser beam interaction zone numerically possible and it is, therefore, a more flexible optical tool than the conventional static optics. A series of cladding test were conducted using a 5 kW fiber laser and an oscillating linear scanner with dynamic powder feeding to determine the process characteristics and their possibilities and limi...

JLA Vol:24 Iss:5 (Laser metal deposition of Inconel 625: Microstructure and mechanical properties)

Authors:
Marleen Rombouts
Gert Maes
Myrjam Mertens
Willy Hendrix
VITO, Vlaamse Instelling voor Technologisch Onderzoek, Department of Materials Technology, Boeretang 200, 2400 Mol, Belgium

Laser metal deposition (LMD) is used in industry to coat, additive manufacture, and/or repair high value metal components through deposition and laser induced melting of powder delivered in a gas stream. This study relates to the production of three-dimensional Inconel 625 components by LMD. After LMD, a dense cellular – dendritic structure containing carbides of the type MC, M₂₃C₆, and M₆C has been detected by x-ray diffr...

JLA Vol:24 Iss:5 (Technical safety measures for the safe use of hand-held laser processing devices)

Authors:
Thomas Puester
Juergen Walter
Michael Hustedt
Volker Wesling
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany

From an occupational safety point of view, the market launch of hand-held laser processing devices (HLDs) should be closely connected to machine safety qualification. In order to meet demands concerning a safe design of HLDs, research was performed to both develop and evaluate safety concepts for HLDs and to qualify technical measures for HLD laser safety. The work focused on the risk of injury especially for the skin arising from laser beam hazards by continuous-wave high-power laser systems typically use...

JLA Vol:24 Iss:5 (The numerical analysis and measurements of temperature profile in fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation for laser-assisted lipolysis)

Authors:
Jong-In Youn
Department of Biomedical Engineering, College of Medical Science, Catholic University of Daegu, Hayangeup, Gyongsansi, Gyongbuk 712-702, South Korea

The purpose of the study is to investigate the temperature profile of fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation (1064, 1320, and 1444 nm wavelengths) for laser-assisted lipolysis. The numerical analysis was performed to assess the wavelength dependence of the temperature distribution in fat tissue. For the internal temperature profile measurements, a cannula was placed in the middle of fat tissue for laser irradiation, and two hypodermic thermocouple needles were placed at 2 and 5 mm...

JLA Vol:25 Iss:1 (Fatigue crack propagation in laser alloyed ductile cast iron surface)

Authors:
Zheng-yang Li
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China and Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

Hai-yan Zhao
Yu Gu
Min-lin Zhong
Bin Zhang
Hong-jun Zhang
Wen-jin Liu
Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

Zhi-yuan Ren
Ming-jiang Yang

JLA Vol:25 Iss:1 (Implementation of a novel scan localization system for wireless sensor networks)

Authors:
K. Sun
W. Huang
Sachula Meng
Y. Xiao
M. T. Wang
Z. Xiao
Inner Mongolia University, Hohhot 010021, China

A novel localization scheme called laser beam scan localization by combining grid and light (laser) with mobile localization policy for wireless sensor networks is designed. The scheme utilizes a moving location assistant (LA) with a laser beam, through which the deployed area is scanned. The LA sends identities to unknown nodes to obtain the locations of sensor nodes. High localization accuracy can be achieved without the aid of expensive hardware on the sensor nodes, as required by other localization systems...