ICALEO 2009 Paper #708 (Optical Properties of Laser-Induced Plume During High Power Laser Welding)

Optical Properties of Laser-Induced Plume During High Power Laser Welding
Authors:
Shinpei Oiwa, Jwri, Osaka University; Osaka Japan
Yousuke Kawahito, Jwri, Osaka University; Osaka Japan
Seiji Katayama, Jwri, Osaka University; Osaka Japan
Presented at ICALEO 2009

During laser welding, laser-induced plume ejecting from a keyhole affects welding results greatly, and therefore this plume is generally removed with a shielding gas. In remote/scanning welding, however, a tall plume is generated in the case of a long focal length lens and no shielding gas, and the weld penetration is greatly reduced. This result is attributed to the Rayleigh scattering due to ultrafine partic...

ICALEO 2009 Paper #706 (Welding Head for 'Self-Guided' Laser Welding)

Welding Head for 'Self-Guided' Laser Welding
Authors:
Boris Regaard, Fraunhofer USA Center for Laser Technology; Plymouth MI USA
Stefan Kaierle, Fraunhofer ILT; Aachen Germany
Stefan Heinemann, Fraunhofer CLT; Plymouth MI USA
Rahul Patwa, Fraunhofer CLT; Plymouth MI USA
Jens-Peter Steinbrecher, Fraunhofer CLT; Plymouth MI USA
Presented at ICALEO 2009

Precise positioning of the laser beam on the work piece is crucial for high quality laser welds; e.g. for butt welding the focal point of the laser beam with respect to the joint must be maintained within an accuracy better than 20 - 150 µm, depending on the focused beam radius. These stringent a...

ICALEO 2009 Paper #705 (An Image-Based "Click & Weld" - Method for Laser Beam Positioning in Micro Welding Applications)

An Image-Based "Click & Weld" - Method for Laser Beam Positioning in Micro Welding Applications
Authors:
Nicolaj C. Stache, Institute of Imaging & Computer Vision, RWTH Aachen Univ.; Aachen Germany
Jonas Dieckelmann, Institute of Imaging & Computer Vision, RWTH Aachen University; Aachen Germany
Jens Gedicke, Fraunhofer Institute for Laser Technology; Aachen Germany
Alexander Olowinsky, Fraunhofer Institute for Laser Technology; Aachen Germany
Til Aach, Institute of Imaging & Computer Vision, RWTH Aachen University; Aachen Germany
Presented at ICALEO 2009

In most laser welding applications the welding result is highly sensitive to the weld posi...

ICALEO 2009 Paper #704 (Spatter Formation and Keyhole Observation with High Speed Cameras - Better Understanding of the Keyhole Formation)

Spatter Formation and Keyhole Observation with High Speed Cameras – Better Understanding of the Keyhole Formation
Authors:
Philipp Gärtner, Forschungsgesellschaft für Strahlwerkzeuge; Stuttgart Germany
Rudolf Weber, -; -
Presented at ICALEO 2009

Pores and spatters are a severe issue in high-brightness laser keyhole welding. An improved understanding of the process is necessary to develop means to prevent these effects. A key to understand the spatter behaviour and the keyhole formation is to observe the welding process with high speed cameras around the workpiece. Different views of the process, from above (in different angle), from below and also from the side through a glas...

ICALEO 2009 Paper #703 (Trudiode: Highest Efficiency and Brilliance for Keyhole Welding)

Trudiode: Highest Efficiency and Brilliance for Keyhole Welding
Authors:
Stephan Strohmaier, TRUMPF Laser GmbH + Co. Kg; Schramberg Germany
Christoph Til Korn, Trumpf Laser Gmbh + Co. Kg; Schramberg Germany
Klaus Loeffler, Presenter not Author; -
Ruediger Brockmann, Trumpf Laser Gmbh + Co. Kg; Schramberg Germany
Klaus Wallmeroth, -; -
John L. Hostetler, TRUMPF Photonics, Inc.; - USA
Christian Schmitz, Trumpf Inc.; Farmington USA
Presented at ICALEO 2009

Diode lasers have already become the most important source for applications in material processing where a limited beam quality is sufficient as they are very reliab...

ICALEO 2009 Paper #702 (The Influence of Parameters on Characteristic of the Molten Pool During Laser Welding of TA15)

The Influence of Parameters on Characteristic of the Molten Pool During Laser Welding of TA15
Authors:
Aiqin Duan, Bamtri; Beijing Peoples Republic of China
Chen Li, BAMTRI; - Peoples Republic of China
Presented at ICALEO 2009

In this paper, the characteristics of molten pool and moving behavior during laser welding of TA15 have been studied through measuring of images. The results show that a molten pool can be roughly divided into three areas: (a)vapor/plasma area ,which fluctuates at frequency of more than 1kHz. (b) liquid area , which temperature is more than 2000K.(c) liquid-solid area ,which is main part of the pool and has small temperature gradient. The further study shows ...

ICALEO 2009 Paper #701 (Design of a Sensor-assisted Control of the Weld Filling Degree for the Manufacturing of Segments for Steam Turbine Cooling)

Design of a Sensor-assisted Control of the Weld Filling Degree for the Manufacturing of Segments for Steam Turbine Cooling
Authors:
Uwe Reisgen, Rwth Aachen University; Aachen Germany
Simon Olschok, Rwth Aachen University, Isf; Aachen Germany
Stefan Longerich, Rwth Aachen University; Aachen Germany
Presented at ICALEO 2009

In order to increase the efficiency of combined cycle power plants up to 65%, special structures consisting of nickel base materials are joined with and without filler materi-als using the laser beam welding method. The particular joining geometry of these structures requires bridging of the air gap during welding. For this purpose, a closed-loop co...

ICALEO 2009 Paper #610 (Macro and Micro Applications for Fibre Lasers in Laser Material Processing of Aerospace Composite Material)

Macro and Micro Applications for Fibre Lasers in Laser Material Processing of Aerospace Composite Material
Authors:
Paul French, Liverpool John Moores University; Liverpool Great Britain
Mo Naeem, Gsi Group; Rugby Great Britain
Emily Leach, Wirral Grammer School for Girls; Wirral Great Britain
John Clowes, Fianium Ltd; Southampton Great Britain
Martin Sharp, Liverpool John Moores University; Liverpool Great Britain
Presented at ICALEO 2009

The aerospace industry is showing an increased interest in composite materials. The A380, A350XWB and the Boeing 787 are using or plan to use a large percentage of composite material in their construction. ...

ICALEO 2009 Paper #609 (Advanced Remote Cutting of Non-Metal Webs and Sheets)

Advanced Remote Cutting of Non-Metal Webs and Sheets
Authors:
Annett Klotzbach, Fraunhofer Institute Material and Beam Technology Dresden; Dresden Germany
Matthias Lutke, Technical University Dresden; Dresden Germany
Andreas Wetzig, Fraunhofer Institute Material and Beam Technology Dresden; Dresden Germany
Eckhard Beyer, Technical University Dresden; Dresden Germany
Presented at ICALEO 2009

Remote processing is known as a new trend to increase productivity of manufacturing processes. Even cutting of non - metals is a large area of potential Remote laser applications. The advantages of high speed and accurate cutting without any proccessing gas enable the c...

ICALEO 2009 Paper #608 (Opportunities to Enlarge the Application Area of Remote - Cutting)

Opportunities to Enlarge the Application Area of Remote - Cutting
Authors:
Matthias Lutke, University of Technology Dresden; Dresden Germany
Thomas Himmer, Fraunhofer Iws; Dresden Germany
Andreas Wetzig, Fraunhofer Iws; Dresden Germany
Eckhard Beyer, Fraunhofer Iws; Dresden Germany
Presented at ICALEO 2009

Remote-cutting is an alternative method to conventional laser cutting processes when working on thin sheets. Going without any cutting gas the inertia can be reduced significantly. Deflected by two mirrors the laser beam becomes more flexible in the working envelope of the scanner. Depending on the sheet thickness cutting speeds of about 100 m/min in con...