ICALEO 2008 Paper #1003 (The Arc in Hybrid Welding Serves As a Sensor for the Process Quality)

The Arc in Hybrid Welding Serves As a Sensor for the Process Quality
Authors:
Uwe Reisgen, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Simon Olschok, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Stefan Jakobs, Rwth Aachen University, Welding and Joining Institute; Aachen Germany
Presented at ICALEO 2008

Laser GMA hybrid welding which has been invented by Bill Steen in the late Seventies of the last century is gaining in importance in the metal-working industry. For this reason, the process is also in the special focus of interest in the fields of research and development. Irregularities in the arc welding process are w...

ICALEO 2008 Paper #1002 (Assessment of Different Laser Hybrid Welding Processes)

Assessment of Different Laser Hybrid Welding Processes
Authors:
Antti Salminen, Lappeenranta University of Technology, Finland; Lappeenranta Finland
Paul Kah, Lappeenranta University of Technology, Finland; Lappeerenta Finland
Jukka Martikainen, Lappeenranta University of Technology, Finland; Lappeenranta Finland
Presented at ICALEO 2008

The hybrid welding process, which combines two welding processes together (e.g. laser and an arc), has received much consideration in recent years as a high speed, highly competent, excellent quality welding process which recompenses weaknesses of the individual welding processes. A variety of experiments in laser/MIG/MAG hybrid weldin...

ICALEO 2007 Paper #Plenary1 (Attosecond Physics)

Attosecond Physics
Authors:
Ferenc Krausz, Max Planck Institute of Quantum Optics; Garching Germany
Reinhard Kienberger, Max Planck Institute of Quantum Optics; Garching Germany
Presented at ICALEO 2007

Fundamental processes in atoms, molecules, as well as condensed matter are triggered or mediated by the motion of electrons inside or between atoms. Electronic dynamics on atomic length scales tends to unfold within tens to thousands of attoseconds (1 attosecond [as] = 10-18 s). Recent breakthroughs in laser science are now opening the door to watching and controlling these hitherto inaccessible microscopic dynamics. The key to accessing the attosecond time domain is the control of ...

ICALEO 2007 Paper #P555 (Development of a Laser-Induced Material Transfer Technique for Patterning of CNT Emitters)

Development of a Laser-Induced Material Transfer Technique for Patterning of CNT Emitters
Authors:
Chung-Wei Cheng, Industrial Technology Research Institute; Tainan County Taiwan
Shih-Chieh Liao, Industrial Technology Research Institute; Taiwan Taiwan
Hui-Ta Chen, Industrial Technology Research Institute; Tainan County Taiwan
Jeng-Rong Ho, National Chung Cheng University; Chia-Yi Taiwan
Hung-Yu Liao, National Chung Cheng University; Chia-Yi Taiwan
J-W John Cheng, National Chung Cheng University; Chia-Yi Taiwan
Presented at ICALEO 2007

A laser-induced forward transfer (LIFT) technique is developed for the patterning of carbon nanot...

ICALEO 2007 Paper #P543 (High Speed Rotation Hardening of Steel Shafts and Holes with High Power Diode Lasers)

High Speed Rotation Hardening of Steel Shafts and Holes with High Power Diode Lasers
Authors:
Guy Claus, Wtcm-Crif; Gent Belgium
Marko Seifert, Fraunhofer Iws; Dresden Germany
Presented at ICALEO 2007

Steel shafts can be hardened by laser using one continuous spiral track. This method however leads to a hardening zone which is not homogeneous in surface hardness and case depth. This is primarily due to the hemispherical shape of the hardening track as well as to tempering effects between two neighboring tracks of the spiral. A new method was developed to solve this problem for cylindrical shafts. The laser hardening was performed by rotating the shafts at a very high speed and by h...

ICALEO 2007 Paper #P542 (Laser Micro Spin Forming)

Laser Micro Spin Forming
Authors:
Danny MacCallum, Sandia National Laboratories; Albuquerque NM USA
Gustav Roman, University of Florida; Gainsfille FL USA
Jeremy Palmer, Sandia National Laboratories; Albuquerque NM USA
Presented at ICALEO 2007

Laser forming has been shown effective as a non-contact bending technique for 0.15 mm thickness cantilever beams made from Neyoro G, a high-strength, high-reflectivity, high thermal conductivity material. The current work reports on efforts to extend laser forming to miniature 3-D axisymmetric shapes from similar thickness originally flat discs.

In conventional spin forming, a rotating sheet metal disk is formed over a shape...

ICALEO 2007 Paper #P541 (Liquid Thermal Cycle during Double-track Laser Cladding of H13 Tool Steel)

Liquid Thermal Cycle during Double-track Laser Cladding of H13 Tool Steel
Authors:
Jyoti Mazumder, CLAIM, University of Michigan; Ann Arbor MI USA
Xiuli He, CLAIM, University of Michigan; Ann Arbor MI USA
Presented at ICALEO 2007

Laser cladding based Direct Metal Deposition (DMD) has received significant attention due to its diversified potential for material processing. Numerical modeling not only helps to understand the complex physical phenomena involved in this process, it can also be used in the process prediction and system control. The evolution of temperature and velocity fields, composition profile during multiple track laser cladding observed during Direct Metal Depositi...

ICALEO 2007 Paper #P539 (Tempering and Wear Resistance of Laser Cladded MMC Coating for Corrugated Rollers)

Tempering and Wear Resistance of Laser Cladded MMC Coating for Corrugated Rollers
Authors:
Minlin Zhong, Tsinghua University; Beijing Peoples Republic of China
Zhaoyong Qian, Tsinghua Univ.; Beijing Peoples Republic of China
Dongye Zhang, Tsinghua University; Beijing Peoples Republic of China
Wenjin Liu, Tsinghua University; Beijing Peoples Republic of China
Ruiquan Kang, Tsinghua University; Beijing Peoples Republic of China
Presented at ICALEO 2007

Corrugated roller is the core and expensive component in the production line of corrugated cardboard. Severe abrasion of the paper during production usually results in early failure of the roller ...

ICALEO 2007 Paper #P537 (Shear Testing of Laser Spotwelds)

Shear Testing of Laser Spotwelds
Authors:
Gerald Knorovsky, Sandia National Laboratories; Albuquerque NM USA
Jerome Norris, Sandia National Laboratories; Albuquerque NM USA
Matthew Perricone, R.J. Lee Group; Monroeville PA USA
Presented at ICALEO 2007

A shear test was used to investigate the effect of shielding gas (Argon, Nitrogen and none) on the properties of laser spot welds in Fe-28Ni-17Co alloy (Kovar). The load vs. displacement curves obtained, while superficially resembling those of a standard tensile test, were quite non-reproducible, and obscured the differences due to process conditions. Fractographic examination of the samples and analysis of the testing ...

ICALEO 2007 Paper #P536 (Rapid Fabrication of Electrical Discharge Machining (EDM) Electrodes by Laser Surface Cladding)

Rapid Fabrication of Electrical Discharge Machining (EDM) Electrodes by Laser Surface Cladding
Authors:
Fernando Lusquiños, Universidade de Vigo; Vigo Spain
Antonio Riveiro, Universidade de Vigo; Vigo Spain
Rafael Comesaña, Universidade de Vigo; Vigo Spain
Félix Quintero, Universidade de Vigo; Vigo Spain
J. del Val, Universidade de Vigo; Vigo Spain
Juan Pou, Universidade de Vigo; Vigo Spain
Presented at ICALEO 2007

Under the term rapid prototyping(RP), different production techniques dedicated to the speedy fabrication of sample parts for demonstrations, evaluation or testing can be included. The rapid prototyping based o...