FG Füge- und Schweißtechnik
Refine
Year of publication
Document Type
- Scientific journal article peer-reviewed (81) (remove)
Way of publication
- Open Access (5)
Keywords
- mechanical properties (8)
- microstructure (6)
- Al – Mg – Si alloy (4)
- Al4043 (2)
- AlSi5 (2)
- Aluminum resistance spot welding (2)
- CO2 methanation (2)
- Ceramic (2)
- Computational welding mechanics (2)
- Distortion analysis (2)
- Electrode water-cooling (2)
- FEM (2)
- Finite element analysis (2)
- Heat transfer (2)
- Virtual manufacturing (2)
- WAAM (2)
- aluminum foam (2)
- cylinder block application (2)
- fatigue strength (2)
- four-point bending (2)
- impulse friction stir welding (2)
- inner diameter coating (2)
- laser welding (2)
- power and frequency of pulses (2)
- structure (2)
- welding (2)
- wire arc additive manufacturing (2)
- 316L (1)
- 3D-Printing (1)
- 3D-printing (1)
- AA2024 (1)
- Additive manufacturing (1)
- Al-Mg-Si alloy (1)
- Al2O3/Cu-O Composites (1)
- Al5356 (1)
- Al5356 alloy (1)
- AlMg5Cr (1)
- AlSi12 (1)
- Arc welding (1)
- Build-up strategy (1)
- CH4 selectivity (1)
- Cold Cracking (1)
- Complex shaped ceramic composites (1)
- Corrosion (1)
- Dissimilar joint (1)
- Dissimilar steel aluminum welding (1)
- EDS measurements (1)
- Elastic-plastic analysis (1)
- Experiment design (1)
- Experimental Testing (1)
- FE simulation (1)
- FE-Simulation (1)
- FE-Simulation des Schweißens (1)
- FE-simulation (1)
- Fluid guiding elements (1)
- GMAW (1)
- Heat source model (1)
- High Strength Steel (1)
- Indentation (1)
- Inherent strain method (1)
- Instrumented experiments (1)
- Kaltriss (1)
- Laser beam build-up welding (1)
- Laser metal deposition (1)
- Laser welding Dissimilar joint Heat source model Finite element analysis Thermal simulation Weld shape (1)
- MAX phases (1)
- Macro-cellular SISIC (1)
- Mechanical (1)
- Mechanical properties (1)
- Microstructure (1)
- Multi-pass weldment (1)
- NbAl3/Al2O3 Composites (1)
- Neutron diffraction (1)
- Non-ferrous metals and alloys (1)
- Physical Simulation (1)
- Pressing and three-dimensional printing (1)
- Pressureless Infiltration (1)
- Reactive Hot Pressing (1)
- Reactive Infiltration (1)
- Reverse analysis (1)
- SLM (1)
- Steel S355 (1)
- Straightening (1)
- Stress distribution (1)
- Structured catalysts (1)
- Submerged are welding (1)
- Thermal Shock Behavior (1)
- Thermal contact conductance (1)
- Thermal simulation (1)
- Thermal straightening (1)
- Thermo-mechanical properties (1)
- Three-dimensional printing (1)
- Triply periodic minimal surfaces (1)
- Wasserstoff- und Stickstoffverteilung (1)
- Weld shape (1)
- Welding simulation (1)
- acicular ferrite (1)
- adhesion strength (1)
- air bending (1)
- air bending, structured sheet metal, simulation (1)
- alumina (1)
- aluminium-steel weld (1)
- aluminum (1)
- aluminum alloy (1)
- aluminum sandwich (1)
- automotive (1)
- bending force (1)
- butt weld (1)
- butt welded joint (1)
- carbon steel (1)
- cgs (1)
- cold arc pulse (1)
- cold arc pulse (CAP) (1)
- cold cracks; finite‐element‐analysis; Kaltrisse (1)
- cold gas spray (1)
- cold gas spraying (CGS) (1)
- cold gas spraying (cgs) (1)
- composite materials (1)
- computational welding mechanics (1)
- computer modeling (1)
- cored wire (1)
- crystallography (1)
- curvilinear seam (1)
- defects formation (1)
- deformation (1)
- dissimilar joint (1)
- electron beam welding (1)
- eutectic formations (1)
- fastest descent method (1)
- fracture behavior (1)
- friction stir welding (1)
- grain structure (1)
- gyroid geometry (1)
- gyroid-3D complex (1)
- hardness (1)
- heat input (1)
- high-alloy steels (1)
- high-speed friction stir welding (HSFSW) (1)
- high-strength steel (1)
- hochfeste Stähle (1)
- hot crack susceptibility (1)
- impulse friction stir welding (IFSW) (1)
- inlayer (1)
- laser beam welding (1)
- laserstrahlgeschweißte Bauteile (1)
- liquation cracks (1)
- metallic foam sandwich (1)
- microhardness (1)
- microscopic chemical analysis (1)
- microstructural characteristics (1)
- microstructure evolution (1)
- modeling of welding and joining (1)
- morphology (1)
- multi-pass welds (1)
- neutron diffraction (1)
- nickel-based alloys (1)
- non-uniformity (1)
- numerische Schweißsimulation,Gefügeumwandlungen,Werkstoffkennwerte (1)
- optimization (1)
- particle velocity (1)
- phase evolution (1)
- physical simulation, Gleeble (1)
- precipitation (1)
- pulse friction stir welding (1)
- remnant oxide line (ROL) (1)
- residual stress (1)
- resistance spot weld (1)
- rsw (1)
- s precipitation (1)
- single-track (1)
- sources method (1)
- stress-strain state (1)
- structur sheet metals (1)
- structured panel (1)
- structured sheet metal (1)
- surfacing (1)
- temperature field (1)
- temperature rates (1)
- tensile properties (1)
- tensile strength (1)
- thermal cycle (1)
- thermal-metallurgical FE simulation (1)
- thermo-mechanical properties (1)
- wear resistance (1)
- welded joint (1)
- welded structures (1)
- welding simulation (1)
- welding temperature field (1)
Institute
This work presents a comparative study towards the development of efficient micro-reactors based on 3D-printed structures. Thus, the study evaluates the influence of the metal substrate geometry on the performance of structured catalysts for the CO2 methanation reaction. For this purpose, 0.5%Ru–15%Ni/MgAl2O4 catalyst is wash coated over two different micro-monolithic metal substrates: a conventional parallel channel honeycomb structure and a novel 3D-printed structure with a complex gyroid geometry. The effect of the metal substrate geometry is analyzed for several CO2 sources including ideal flue gas atmospheres, the presence of residual CH4 and CO in the flue gas, as well as simulated biogas sources. The advantages of the gyroid-3D complex geometries over the honeycomb structures are shown for all evaluated conditions, providing at the best-case scenario a 14% improvement of CO2 conversion. Moreover, this contribution shows that systematically tailoring geometrical features of structured catalysts becomes an effective strategy to achieve improved catalysts performances independent of the flue gas composition. By enhancing the transport processes and the gas-catalyst interactions, the employed gyroid 3D metal substrates enable boosted CO2 conversions and greater CH4 selectivity within diffusional controlled regimes.
Deposition of Ti-6Al-4V using laser and wire, part II: Hardness and dimensions of single beads
(2011)
The formation of acicular ferrite in the structure of weld deposits when welding carbon steels is often associated with the introduction of nonmetallic additives into the electrode material. Fe–alumina composite powders with alumina particles less than 1 µm were used as a filler for cored welding wire and the influence of aluminum oxide additives up to 2,5 wt.% on the structure of the welded seam was studied. It was shown that the addition of aluminum oxide to the welding wire led to the initiation of the formation of intragranular acicular ferrite in the weld deposit and to a more even distribution of hardness through the zones of weld seam.
Numerical models for thermo-mechanical simulation of the welding
residual stresses in laser beam and multi-pass arc welded joints are developed. The models describe the resulting microstructure as a function of the peak temperature, austenization time, cooling time and take into account the microstructure formed after
single or multiple thermal cycles. The results of simulations are validated by neutron diffraction experiments performed on FSD diffractometer at the IBR-2 pulsed reactor in FLNP JINR (Dubna, Russia). The elaborated numerical models are in good agreement
with obtained neutron diffraction data, which enable to study the influence of different conditions and process parameters on the distribution of residual welding stresses.
Cored wires are used in numerous welding processes with or without extern al gas or flux shielding. Submerged are welding (SAW) with eored wires, seamed or seamless, for joining mild and low alloyed steel grades is a technique that has demonstrated clear advantages during the three last decades. Ever since its invention, the SAW process has evolved with one main goal: to combine quality with produetivity. With low alloy wires, the benefits have already been clearly demonstrated and widely exploited. However, little has been written on SA Wand cladding with eored wires for eorrosion or he at resisting applieations. Its extension to high alloy eompositions brings eorresponding benefits and adds so me specific and unique features. This paper foeuses on consumable specificities and on the quality and productivity features of SAW with CRA (corrosion resistant alloy) cored wires. It deseribes the potential as weIl as the limitations ofthis technique. Cored wires are now used for submerged are welding of almost aIl stainless steels ranging from soft martensitic to super-duplex, and for aseries of nickel base compositions as weIl as for cladding cobalt base aIloys. Examples of industrial applications with austenitic, duplex, martensitic and heat resisting stainless steels are given to illustrate the potential ofthe eored wire solution.
The work deals with the elastic-plastic thermo-mechanical deformation process after spot heating of large thin plates. It promotes a new theoretical model of the process. The main target is to clarify the kinetics of the plastic strain formation during thermal straightening and to explore the main interactions. For this purpose, a simplified mechanical problem is formulated and applied. As a result, definite thermo-mechanical relations between temperature, initial strain, and accumulated plastic strain are obtained. Finally, a verification study is presented and discussed. The results contribute to extending the knowledge about the process and to establishing a theoretical background for development of applied analytical or analytical-numerical approaches for practical use in the designing and planning phases in welding production. An application to a particular case is described in an accompanying paper (part 2).
An analytical model based on a theoretical model established in the previous work (part 1) is developed. The analytical model considers the particular case of an instantaneous high-density heat source acting on a thin pre-stressed plate. It calculates the plastic strain and the area of the zone of plastic deformation. A theoretical study is performed in order to quantify the major factors that influence the plastic strain formation. Furthermore, the work presents a calculation procedure for distortion analysis of lar ge and complex structures, intended to be used for solving industrial tasks. The calculation procedure consists of a combination of the analytical solution and an elastic finite element analysis with the aid of the inherent strain approach. Various aspects of its application are also discussed. The calculation procedure is finally explained using a simple example. Its reliability and practicability are demonstrated through verification and validation studies. The work is dedicated to the thermal straightening of thin-walled welded structures; however, it can also be related to other processes.