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:7 Iss:2 (Fraunhofer‐Institut fu¨r Lasertechnik)

Authors:
Eckhard Beyer
Fraunhofer‐Institut fu¨r Lasertechnik, Aachen, Germany

JLA Vol:14 Iss:1 (Multiple reflection and its influence on keyhole evolution)

Authors:
Hyungson Ki
Pravansu S. Mohanty
Jyotirmoy Mazumder
Center for Laser Aided Intelligent Manufacturing, Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, Michigan 48109-2125

In laser drilling and keyhole welding, multiple reflection phenomena determine how the energy is transferred from the laser beam to the workpiece, and, most importantly, all other physics such as fluid flow, heat transfer, and the cavity shape itself depend on these phenomena. In this study, a multiple reflection model inside a self-consistent (or self-evolving) cavity has been developed based on the level set method and ray tracing t...

JLA Vol:18 Iss:2 (Laser ablation of silicon wafer with a water microdrop)

Authors:
Kouki Shimizu
Kunimitsu Takahashi
Photonics and Materials Research Department, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba 277-0861, Japan

Hiroshi Morikazu
Nobumori Ogoshi
Koichi Takeyama
DISCO Corporation, 13-11 Omori-Kita 2-chome, Ota-ku, Tokyo 143-8580, Japan

Yoji Wakayama
LINTEC Corporation, 5-14-42 Nishiki-cho, Warabi-shi, Saitama 335-0005, Japan

Tetsuro Obara
Saitama University, 255-Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan

We have developed a new laser ablation process using a water-microdrop with a diameter of 70 μm....

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:9 Iss:4 (Dual wavelength laser beam alloying of aluminum alloy for enhanced corrosion resistance)

Authors:
Z. Liu
K. G. Watkins
W. M. Steen
R. Vilar
M. G. Ferreira

Aluminum alloys are known for their poor resistance to localized attack and, in particular, for pitting in chloride‐containing electrolytes. In this paper, improvement of the pitting corrosion resistance of 2014‐T6 aluminum alloy has been investigated by means of laser surface alloying of Cr into the substrate. Since aluminum is a highly reflective and thermally conductive material, it is often difficult to process with laser beams. Oxide films on the surface can prevent surface alloying as with the case of Cr alloying into aluminum by in‐situ...

JLA Vol:4 Iss:1 (The Impact of European Standards, Directives and the CE Mark)

Authors:
A. Roy Henderson
Bioptica, St. John's Innovation Park, Cambridge U.K.

JLA Vol:16 Iss:3 (Laser microspot welding of copper)

Authors:
S. Amorosi
Th. Sidler
R. P. Salathe´
Advanced Photonics Laboratory, Ecole Polytechnique Fe´de´rale de Lausanne, Switzerland

H. P. Schwob
J. Hertzberg
LASAG AG, Thun, Switzerland

We describe a novel procedure for highly reliable microspot welding of copper based on a calibrated on-line reflectivity measurement. This parameter is used to control the laser power slope and the weld spot diameter. Reliable welds are obtained without the need of other active control mechanisms. The new technique allows realizing welds with a diameter close to the laser beam waist and leads to a reduction in the relative ...

JLA Vol:20 Iss:4 (Tailored hybrid blank production—New joining concepts using different solders)

Authors:
C. von der Haar
L. Engelbrecht
O. Meier
A. Ostendorf
H. Haferkamp
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

A consistent lightweight concept necessitates the combination of different lightweight materials. Because of the significant weight reduction, multimaterial design is becoming more and more interesting for the transportation industry. Mixed material concepts are partially limited because of the insufficient deformation behavior of the joining seams. To overcome this limitation, a brazing process has been developed in which aluminium and steel can be joined, with an enhanced deformation beha...

JLA Vol:23 Iss:4 (Investigation of the effect of irradiance and pulse duration in industrial percussion laser-drilling of Waspaloy)

Authors:
Robin Bright
Harris L. Marcus
Institute of Materials Science and the Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269-3136

As the use of pulsed lasers in the manufacture of cooling holes in high-temperature gas-turbine engine components continues to increase, understanding the material behavior during laser-material interaction and the subsequent effects on hole quality becomes critical. In this study, atomic emission spectroscopy is used to monitor the optical characteristics of ejected material during percussion laser-drilling of Waspaloy over irradiance and pulse duration values in the ranges...