A5058292120- Laser Material Processing Techniques
- Welding Techniques and Residual Stresses
- Laser and Thermal Forming Techniques
- Additive Manufacturing Materials and Processes
- Electronic Packaging and Soldering Technologies
- Advanced Welding Techniques Analysis
- Semiconductor Lasers and Optical Devices
- Advanced Surface Polishing Techniques
- 3D IC and TSV technologies
- Surface Roughness and Optical Measurements
- Advanced machining processes and optimization
- Adhesion, Friction, and Surface Interactions
- Ocular and Laser Science Research
- Structural Analysis of Composite Materials
- Additive Manufacturing and 3D Printing Technologies
- Metal and Thin Film Mechanics
- Advanced Measurement and Metrology Techniques
- Manufacturing Process and Optimization
- Material Properties and Applications
- Non-Destructive Testing Techniques
- Laser-induced spectroscopy and plasma
- Optical measurement and interference techniques
- Sensor Technology and Measurement Systems
- Silicon and Solar Cell Technologies
- Metallurgical and Alloy Processes
Fraunhofer Institute for Laser Technology
2016-2025
Helmholtz-Zentrum Hereon
2022
Robert Bosch (Germany)
2019
Carl Zeiss (Germany)
2019
RWTH Aachen University
2007-2018
Fraunhofer Institute for Reliability and Microintegration
2017
Heinrich Heine University Düsseldorf
2016
Fraunhofer Society
2000-2015
VTT Technical Research Centre of Finland
2013
Nitto (Japan)
2008-2010
Hybrid components combine the contradictory characteristics of plastics and metal thus can lead to advantageous construction part properties. As a result light concomitantly stiff be produced. Therefore, need for joining these dissimilar materials is central challenge. A new approach overcome problems state-of-the-art technologies using laser radiation ablate surface in order create microstructures with undercut grooves. When above placed plastic melted or induction joining, material expands...
Laser welding of copper is being used with increasing demand for contacting applications in electric components such as batteries, power electronics, and drives. With its local, non-contact energy input high automation capability enabling reproducible weld quality, this joining technology represents a key enabler future mobility systems. However, major challenge process design the combination efficiency precise guidance terms seam depth defect prevention (i.e., spatter melt ejections) due to...
Known as challenging material combination, the welding of aluminium and copper, both with strongly different thermophysical properties, causes joining failures such pores, cracks or intermetallic phases in solidified area. To investigate mixing materials occurrence laser process is observed synchrotron radiation which visualizes phase boundaries between solid, liquid gaseous phases. This allows visualization pore formation density differences inside melt pool. In this investigation, front...
Bipolar plates are structured thin metal sheets and are, next to the membrane electrode assembly (MEA), one of main components polymer electrolyte fuel cells. One production steps such bipolar is joining process its two halves. Laser welding a suitable method for an application since it fast, non-contact, automatable, scalable. Particularly important aspects weld seam width depth. In this paper, stainless-steel material analogous materials used in examined. For purpose, newly developed quasi...
Abstract In laser transmission welding of thermoplastics the optical properties joining parts determine quality result. Especially, scattering radiation in transparent part has an impact on weld seam properties. This is caused by additives. For polycarbonate (PC) with different additives transmittance, reflectance and collimated transmittance are measured a UV‐VIS‐NIR spectrometer. From this data, properties, such as coefficient, absorption anisotropy factor calculated. The calculations made...
Abstract The rising demand for high power battery systems the electric mobility requires connection of a large number cells. Due to functionality cell chemistry, combination copper and aluminium is necessary. differing material properties like thermal conductivity as well formation intermetallic phases are challenging welding processes. This study contains results overlap joints using laser beam process with spatial modulation. With parameter variation, cross-sectional shape weld seams...
Abstract The electrification of the automobile industry leads to an increasing demand for high-performance energy storage systems. more complex battery pack, electronic components will become. Very high currents have be transported in a short time and very fast electrical switching processes made possible. These requirements effect on required quality connection. Furthermore, joining process is that offers cycle times degree automation. Laser micro welding with fibre lasers (1070 nm) meets...
Laser glass frit sealing is a joining method predestined in electronics for the of engineered materials housings dimensions some 1 mm2 to several 10 mm2. The application field ranges from encapsulation display panels sensor housings. enables hermetical closure excluding humidity and gas penetration. But seam quality also interesting other applications requiring sealing. One vacuum insulation glass. gap between two panes must be evacuated reducing thermal conductivity. Only an efficient...
Particularly in the automotive industry, combination of dissimilar materials presents manufacturing engineering with major challenges. Notably, adapted use plastic and metal opens up further potential for weight savings. Directly firmly bonding two together fails, however, on account chemical physical dissimilarity metal. Since joining plastics metals nowadays is based adhesive bonding, joint weak underlies ageing processes. A promising approach to overcome these problems a laser two-step...
Laser transmission welding is usually known to put little thermal stress on the joining partners, indicated by a small heat affected zone (HAZ). However, this only applies when partners have adapted optical properties. When it comes of optically equal thermoplastics without absorbers, main issue HAZ extending far from interface. To enable lasers emitting within polymer's intrinsic absorption bands are used. So far, different beam shaping approaches already been investigated achieve selective...
The growing electrification of vehicles and tools increases the demand for low resistance contacts. Today’s batteries electric consist large quantities single battery cells to reach desired nominal voltage energy. Each cell needs a contacting its terminals, which raises necessity an automated process with joint resistances reduce energy loss in transitions. A capable joining suitable highly electrically conductive materials like copper or aluminium is laser beam welding. This study contains...
Abstract The increasing demand for contacting applications in electric components such as batteries, power electronics and drives is boosting the use of laser-based copper processing. Laser beam welding a key an efficient high-quality vehicle production due to its local, non-contact energy input high automation capability enabling reproducible weld quality. Nevertheless, major challenge process design combination energy-efficiency precise guidance with regard seam depth defect prevention...
Abstract Laser ribbon bonding is a new field of application for laser micro welding in the electronics industry especially area power electronics. Traditional conducted by using ultrasonic to create bond between aluminum or copper and conductive surface. By adapting an bonder equipping it with fiber laser, galvanometric scanner beam focusing delivery system, technology created. The presented work includes test results ribbons thickness 300 μm DCB-substrates system design “laser bonder”. For...
Abstract The generation of low surface roughness the cut edge during laser beam cutting is a challenge. striation pattern, which determines roughness, can be distinguished into regular and interrupted striations, latter resulting in an increased roughness. In order to analyse their formation, space- time-resolved front geometry melt film thickness were captured fusion aluminium sheets with framerate 1000 Hz by means high-speed synchrotron X-ray imaging. comparison contours fronts for result...