JLA Vol:22 Iss:4 (Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel)

Authors:
Elin M. Westin
Outokumpu Stainless AB, Avesta Research Center, P.O. Box 74, 774 22 Avesta, Sweden

Anna Fellman
Laser Processing Laboratory, Lappeenranta University of Technology, Tuotantokatu 2, 53850 Lappeenranta, Finland

The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101^® (EN 1.4162, UNS S32101) has a low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without fille...

JLA Vol:22 Iss:4 (Erratum: “Weld strength improvement for Al alloy by using laser weaving method” [J. Laser Appl. 22(3), 116 (2010)])

Authors:
Kwang-Deok Choi
Young-Nam Ahn
Cheolhee Kim
Advanced Welding & Joining Technology Research Team, Korea Institute of Industrial Technology, 7-47 Songdo-Dong, Yeonsu-Gu, Incheon 406-840, Korea

JLA Vol:22 Iss:4 (Experimental study on edge effects in laser bending)

Authors:
Jun Hu
Qianqian Cao
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Hong Shen
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China and State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China

The phenomenon of edge effects in the laser bending process influences the accuracy of the bending metal sheet and limits the applications of laser bending in the field of high precision. In this paper, the experimental study of effects of the laser power, beam diameter, and scanning velocity on edge effects using Taguchi method is carried out. The results ...

JLA Vol:22 Iss:4 (Image-based creation and positioning of welds for accelerated prototyping)

Authors:
N. C. Stache
J. Dieckelmann
Institute of Imaging and Computer Vision, RWTH Aachen University, 52056 Aachen, Germany

J. Gedicke
A. Olowinsky
Fraunhofer Institute for Laser Technology, Steinbachstr. 15, 52074 Aachen, Germany

T. Aach
Institute of Imaging and Computer Vision, RWTH Aachen University, 52056 Aachen, Germany

In most laser welding applications the welding result is highly sensitive to the weld position. The initial determination of process parameters therefore requires time-consuming adjustments to be made. When manufacturing individual parts with low quantities, this is a significant cost driver. S...

JLA Vol:22 Iss:4 (Laser alloying of Al with mixed Ni, Ti and SiC powders)

Authors:
L. Mabhali
Council for Scientific and Industrial Research, National Laser Centre, P.O. Box 375, Building 46F, Pretoria 0001, South Africa and School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa

S. Pityana
Council for Scientific and Industrial Research, National Laser Centre, P.O. Box 375, Building 46F, Pretoria 0001, South Africa

N. Sacks
School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa

Laser alloying of aluminum AA1200 was performed with a 4.4 kW Rofin Sinar Nd:YAG laser to improve the surfa...

JLA Vol:22 Iss:4 (Two methods for measuring laser beam diameter)

Authors:
Wesley J. Marshall
USAPHC, Aberdeen Proving Ground, Maryland 21010-5403, USA

Two methods for measuring beam diameter are described with the derivation of the equations that make them valid. These methods are the aperture method and the knife edge technique. These methods have been used for decades; however, many do not have a firm grasp of the basic equations that make the methods valid and therefore cannot use and modify the methods with confidence to produce the desired results. The text derives the equations from basic science and mathematics to clarify the underlying concepts of the methods.

JLA Vol:23 Iss:1 (A practical use of humping effect in laser beam welding)

Authors:
Hongping Gu
Boris Shulkin
Stronach Centre for Innovation Magna International Inc., Aurora, Ontario, Canada L4G 7L6

The humping effect in laser beam welding has long been recognized as an adverse effect that limits the achievable welding speed in high power laser beam welding applications. By nature, this effect results in a rough weld bead in laser beam welding and affects the weld integrity. In the past, efforts have been made to suppress the humping effect in laser welding. However, it has been found that the humping effect can have a practical use during the preprocess stage for generating “dimples” for laser beam lap welding of zinc coated sheet m...

JLA Vol:23 Iss:1 (Behavior of basalt under laser-induced shock-wave application to the planetary hypervelocity impact effect)

Authors:
Laurent Berthe
Laboratoire PIMM, UPR CNRS 8006/ARTS et METIERS PARIS TECH, 151 Boulevard de l’Hoˆpital, 75013 Paris, France

Natalia S. Bezaeva
CEREGE, UMR CNRS/Aix-Marseille Universite´, BP 80, 13545 Aix-en-Provence Cedex 4, France; Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Earth Physics Department, Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie gory, 119991 Moscow, Russia

Jeroˆme Gattaceca
CEREGE, UMR CNRS/Aix-Marseille Universite´, BP 80, 13545 Aix-en-Provence Cedex 4, France

Michel Boustie

JLA Vol:23 Iss:1 (Editorial)

Authors:
Reinhart Poprawe

JLA Vol:23 Iss:1 (Mechanical and microstructural characteristics of the dissimilar materials butt joints by hybrid CO₂ laser-gas metal arc welding)

Authors:
HeeSeon Bang
HanSur Bang
Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 501-759, Republic of Korea

YouChul Kim
Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan

IkHyun Oh
Automotive Components Center, Korea Institute of Industrial Technology, Gwangju 500-480, Republic of Korea

BackSub Sung
Eco-friendly Components and Materials Education Center for Automobile, Gwangju 501-759, Republic of Korea

This paper intends to present the applicability of hybrid [CO₂ laser+gas metal arc (GMA)] welding process to dissimilar materials A...