ICALEO 2011 Paper #309 (Laser Beam Welding with High-Frequency Beam Oscillation: Welding of Dissimilar Materials with Brilliant Fiber Lasers)

Laser Beam Welding with High-Frequency Beam Oscillation: Welding of Dissimilar Materials with Brilliant Fiber Lasers
Authors:
Mathias Kraetzsch, Fraunhofer Institute for Material and Beam Technology (IWS); Dresden Germany
Jens Standfuss, Fraunhofer Institute for Material and Beam Technology (IWS); - USA
Annett Klotzbach, Fraunhofer Institute for Material and Beam Technology (IWS); -
Joerg Kaspar, Fraunhofer Institute for Material and Beam Technology (IWS); -
Berndt Brenner, Fraunhofer Institute for Material and Beam Technology (IWS); Dresden Germany
Eckhard Beyer, Fraunhofer Institute for Material and Beam Technology (IWS), Dresden University of ...

ICALEO 2011 Paper #308 (Understanding the Influence of the Focal Position in Laser Welding on Spatter Reduction)

Understanding the Influence of the Focal Position in Laser Welding on Spatter Reduction
Authors:
Jan-Philipp Weberpals, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Philipp Krueger, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Peter Berger, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Thomas Graf, Institut fuer Strahlwerkzeuge (IFSW); Stuttgart Germany
Presented at ICALEO 2011

Particularly the automation and industrialization of thermal material processing with lasers of 1 micrometer-radiation makes high demands on the resulting welding quality. Indeed, current laser systems with strong focusability exhibit a high innovatio...

ICALEO 2011 Paper #307 (Comparison of Spatter Characteristics in Fiber and CO2 Laser Beam Welding of Aluminum Alloy)

Comparison of Spatter Characteristics in Fiber and CO2 Laser Beam Welding of Aluminum Alloy
Authors:
Hua Cai, Beijing University of Technology; Beijing Peoples Republic of China
Rongshi Xiao, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2011

Spatters in laser penetration welding of aluminum alloys will pollute the focusing system, which would affect the processing stability and welding quality. Furthermore, the spatter characteristics can reflect the laser welding process in some degree. In this paper, the spatter characteristics in fiber and CO2 laser welding of 6061-T6 aluminum alloy are investigated. Dynamic behavior of spatters is reco...

ICALEO 2011 Paper #305 (Laser Narrow Gap Welding of Thick Carbon Steels Using High Brightness Laser with Beam Oscillation)

Laser Narrow Gap Welding of Thick Carbon Steels Using High Brightness Laser with Beam Oscillation
Authors:
Takeshi Tsukamoto, Hitachi, Ltd.; Hitachi-Shi Japan
Hirotsugu Kawanaka, Hitachi, Ltd.; Hitachi-Shi Japan
Yoshihisa Maeda, Hitachi Plant Technologies, Ltd.; Tsuchiura-Shi Japan
Presented at ICALEO 2011

Laser narrow gap welding with beam oscillation was developed to prevent lack of fusion and hot cracking in the welding of thick steel plates. The weld qualities of carbon steel joints of 60 and 150mm thickness were examined in this work. The results show that beam oscillation condition, especially oscillation amplitude affects soundness of the weld, and must be adjus...

ICALEO 2011 Paper #303 (Resistance Spot Welding Gun Meets Fiber Laser - An Alternative to Remote Welding?)

Resistance Spot Welding Gun Meets Fiber Laser – An Alternative to Remote Welding?
Authors:
Klaus Krastel, IPG Laser GmbH; Burbach Germany
Presented at ICALEO 2011

For today's high volume production in the automotive industry, resistance spot welding and laser remote welding, while well established, present pro's and con's. For laser remote welding the main advantage is the significant cycle time reduction due to almost complete elimination of idle times and the advantages of laser welded seams. For resistance spot welding an advantage is the integrated clamping technology, which comes nearly for free. IPG Laser GmbH has combined these advantages in a new technology, offering the resistance sp...

ICALEO 2011 Paper #302 (New Type of Laser Welded Wall Panel of Train Coach)

New Type of Laser Welded Wall Panel of Train Coach
Authors:
Jukka Siltanen, Rautaruukki Oyj, Harvialantie 420; Hämeenlinna Finland
Ilpo Maaranen, Rautaruukki Oyj, Telakkatie 5; Uusikaupunki Finland
Ville-Matti Nurmela, Rautaruukki Oyj, Telakkatie; Uusikaupunki Finland
Presented at ICALEO 2011

The use of laser technology is assumed to be quite common in heavy industry. However, it requires extra effort to find a success story of an industrial application based on the use of the technology. Reasons for this include confidentiality and the fact that the amount of applications is still limited. This paper presents one of the success stories, a new type of laser-welded wal...

ICALEO 2011 Paper #208 (A Beam Monitoring System for Large and Scanned Laser Spots - Lasmon)

A Beam Monitoring System for Large and Scanned Laser Spots - Lasmon
Authors:
Jan Hannweber, Fraunhofer IWS; Dresden Germany
Presented at ICALEO 2011

A novel monitoring system for large, formed and scanned high power laser beams is presented, how they are particular used for industrial laser hardening processes. The system design is very simple, inexpensive and easily adaptable. The software offers the possibility to identify all standard beam parameters as the beam parameter product, power density distribution, Rayleigh length and FWHM. In addition, functions specifically for laser beam hardening are provided. Significant applications are in the area of quality and process control, such as the ...

ICALEO 2011 Paper #207 (A Rapid Image Processing Algorithm for Structured Light Stripe Welding Seam Tracking in Laser Welding)

A Rapid Image Processing Algorithm for Structured Light Stripe Welding Seam Tracking in Laser Welding
Authors:
Xian-feng Shen, Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics; Mianyang Peoples Republic of China
Wenhua Teng, Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics; Mianyang, Sichuan Peoples Republic of China
Presented at ICALEO 2011

Welding seam tracking plays an important role in improving welding quality, reducing rejection rate and repair rate in which accurately and real-time image processing is one of the most important objectives. Butt weld without groove in laser welding increases the difficul...

ICALEO 2011 Paper #206 (Online Measurement and Closed Loop Control of Penetration Depth in Laser Welding Processes)

Online Measurement and Closed Loop Control of Penetration Depth in Laser Welding Processes
Authors:
Felix Abt, IFSW, Institut fuer Strahlwerkzeuge; Stuttgart Germany
Harald Woelfelschneider, Fraunhofer Institute for Physical Measurement Techniques IPM; Freiburg Im Breisgau Germany
Claudia Baulig, Fraunhofer Institute for Physical Measurement Techniques IPM; Freiburg Im Breisgau Germany
Heinrich Hoefler, Fraunhofer Institute for Physical Measurement Techniques IPM; Freiburg Im Breisgau Germany
Rudolf Weber, IFSW, Institut fuer Strahlwerkzeuge; Stuttgart Germany
Thomas Graf, IFSW, Institut fuer Strahlwerkzeuge; Stuttgart Germany
Presented at...

ICALEO 2011 Paper #205 (Real-Time Process Control by Machine Vision)

Real-Time Process Control by Machine Vision
Authors:
Christoph Franz, Fraunhofer ILT; Aachen Germany
Peter Abels, Fraunhofer ILT; Aachen Germany
Michael Merz, Fraunhofer ILT; Aachen Germany
Holger Singpiel, Silicon Software GmbH; Mannheim Germany
Johannes Trein, Silicon Software GmbH; Mannheim Germany
Presented at ICALEO 2011

Quality assurance in laser processing is often provided by post process inspections with machine vision solutions. When process stability gain is needed, one-dimensional signals like diodes or pyrometers which measure the emitted radiation of the laser process may be applied for closed-loop control of e.g. the laser power...