A5058923653- Welding Techniques and Residual Stresses
- Additive Manufacturing Materials and Processes
- Laser Material Processing Techniques
- Laser and Thermal Forming Techniques
- Metal and Thin Film Mechanics
- Advanced Welding Techniques Analysis
- GNSS positioning and interference
- Orbital Angular Momentum in Optics
- Non-Destructive Testing Techniques
- Digital Holography and Microscopy
- Mobile Agent-Based Network Management
- Solidification and crystal growth phenomena
- Microfluidic and Bio-sensing Technologies
- Heat Transfer and Optimization
- Ionosphere and magnetosphere dynamics
- Surface Roughness and Optical Measurements
- Sports Dynamics and Biomechanics
- Tribology and Lubrication Engineering
- Calibration and Measurement Techniques
- Advanced machining processes and optimization
- Metal Alloys Wear and Properties
- High Entropy Alloys Studies
- Advanced Surface Polishing Techniques
- Electronic Packaging and Soldering Technologies
- Particle Dynamics in Fluid Flows
RWTH Aachen University
2017-2021
University of Münster
2015
Laser micro welding is specified with geometries below 1 mm and used increasing demand for contacting electronic components such as battery fuel cells. Fiber lasers a wavelength in the near infrared range (IR, λ ≈ µm) have established themselves this purpose. The laser process allows processing of parts micron but reduces surface quality processed at same time. Furthermore, weld defects can occur due to instabilities caused by low absorptivity (<5%) copper radiation. Therefore, alternative...
Generation of micro- and nanostructured complex light beams attains increasing impact in photonics laser applications. In this contribution, we demonstrate the implementation experimental realization relatively unknown, but highly versatile class complex-valued Elegant Hermite- Laguerre-Gaussian beams. These create higher trapping forces compared to standard Gaussian fields due their propagation changing properties. We optical alignment functional particles as nanocontainers with will...
Laser welding of copper is gaining more and importance to create electrical contacts due the high temperature resistance achievable mechanical loads. However, laser in past was always associated with low process stability. By using brightness fiber sources, small spots can be generated which allows keyhole-based deep penetration even quality. Unfortunately, a spot size keyhole lead connection area between two joining partners. To avoid this, spatial power modulation—a linear feed superposed...
Laser metal deposition (LMD) process has been widely used in many industrial applications such as automotive, defense, aerospace, and so on. Modeling to address physical phenomena like laser-powder interaction, heat transfer, fusion, solidification, track formation. LMD induces a complex thermal stress field that results residual distributions. Depending on its magnitude nature (i.e., whether tensile or compressive), the stresses can cause unpredicted in-service failures. Therefore,...
Abstract In laser deep penetration welding, the knowledge on temperature history of material is great interest for assessment quality properties weld. For this purpose a hybrid process model that enables fast calculation distributions as function parameters applied. The interaction between and taken into account by reduced keyhole model, which exploits hierarchy in spatial dimensions occurring at high feed rates. resulting shape stationary introduced Dirichlet boundary thermal finite element...
Abstract Due to the change in grain size during laser processing heat‐affected zone and solidifying material, potential of cracking, surface hardening, decrease weldability, corrosion resistance fatigue life may result. It is shown that through combining state‐of‐the‐art temperature simulation processes with thermo‐mechanical volume averaging formation simulation, resulting density can be predicted within order magnitude found two experiments carried out for fusion cutting spot welding A356....
Within the topical field of three-dimensional holographic beam shaping, modulation complex light fields in amplitude, phase and polarization is demonstrated. Different kinds higher order modes will be discussed applied optical micro-manipulation.