693.932 PEOPLE
| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kaierle, Stefan
Leibniz University Hannover
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (58/58 displayed)
- 2024Optimization of process parameters for TMPS lattice structures
- 2023Intermixing behavior of 1.4430 stainless steel and 1.4718 valve steel in <i>in situ</i> alloying using coaxial laser double-wire laser directed energy depositioncitations
- 2023Finite Element Simulation and Experimental Assessment of Laser Cutting Unidirectional CFRP at Cutting Angles of 45° and 90°
- 2023Application of the ABA cladding technique to a wire based laser cladding processcitations
- 2023Investigations on laser beam welding of thin aluminum foils with additional filler wirecitations
- 2023Laser beam welding of brass with combined core and ring beamcitations
- 2022Laser beam brazing of aluminum alloys in XHV-adequate atmosphere with surface deoxidation by ns-pulsed laser radiationcitations
- 2022Investigations on microstructure and mechanical properties of laser beam-submerged arc hybrid welded butt joints of duplex stainless steel S31083 (t =16 mm) depending on the energy per unit lengthcitations
- 2022Investigations on laser beam welding of thin foils of copper and aluminum regarding weld seam quality using different laser beam sourcescitations
- 2022Development of an empirical process model for adjusted porosity in laser-based powder bed fusion of Ti-6Al-4Vcitations
- 2022Discoloration of AISI 420 stainless steel in dependence of inter layer time during Laser-based Powder Bed Fusion
- 2022Large-scale CO2 laser-based sol-gel annealing of titanium dioxide on borosilicate glass
- 2022Residual oxygen content and powder recycling: effects on microstructure and mechanical properties of additively manufactured Ti-6Al-4V partscitations
- 2022Investigations on the effect of standing ultrasonic waves on the microstructure and hardness of laser beam welded butt joints of stainless steel and nickel base alloycitations
- 2022Laser-based powder bed fusion of Ti-6Al-4V powder modified with SiO2 nanoparticlescitations
- 2022Investigations on the Specifics of Laser Power Modulation in Laser Beam Welding of Round Barscitations
- 2022CO2 laser based welding of borosilicate glass by Laser Glass Deposition
- 2022Macroscopic simulation model for laser cutting of carbon fibre reinforced plastics
- 2022Influence of an oxygen-free atmosphere on laser beam brazing of aluminium with prior surface deoxidation by pulsed laser radiation
- 2022Advances in powder bed based Additive Manufacturing of metal-glass-hybrid-components
- 2022Investigations on laser beam welding of thick steel plates using a high-power diode laser beam sourcecitations
- 2022High deposition rate welding with a laser line optics with the laser-assisted double-wire deposition welding process with nontransferred arccitations
- 2022Deep Learning-Based Weld Contour and Defect Detection from Micrographs of Laser Beam Welded Semi-Finished Productscitations
- 2022Design of additively manufacturable injection molds with conformal cooling
- 2021Laser-based powder bed fusion of niobium with different build-up ratescitations
- 2021Individualized and controlled laser beam pretreatment process for adhesive bonding of fiber-reinforced plastics. II. Automatic laser process control by spectrometrycitations
- 2021Influence of degree of deformation on welding pore reduction in high-carbon steelscitations
- 2021Influence of process-related heat accumulation of laser beam welded 1.7035 round bars on weld pool shape and weld defectscitations
- 2021Investigations on laser welding of dissimilar joints of stainless steel and copper for hot crack preventioncitations
- 2021Hyperspectral imaging for prediction of surface roughness in laser powder bed fusioncitations
- 2020Influence of ultrasound on pore and crack formation in laser beam welding of nickel-base alloy round bars
- 2020Additive manufacturing of metal-bonded grinding toolscitations
- 2020Numerical simulation and experimental validation of the cladding material distribution of hybrid semi-finished products produced by deposition welding and cross-wedge rollingcitations
- 2020Laser powder bed fusion of WE43 in hydrogen-argon-gas atmosphere
- 2020Influence of Ultrasound on Pore and Crack Formation in Laser Beam Welding of Nickel-Base Alloy Round Barscitations
- 2019Surface integrity of laser beam welded steel– aluminium alloy hybrid shafts after turning
- 2019Manipulating the melt propagation of short arc gas metal arc welding with diode lasers &lt;1 kW for improvement in flexibility and process robustnesscitations
- 2019Surface Integrity of Laser Beam Welded Steel–Aluminium Alloy Hybrid Shafts after Turningcitations
- 2018Additive manufacturing of glass: CO2-Laser glass deposition printing
- 2018Investigation of the composite strength of hybrid steel-steel semi-finished products manufactured by laser beam welding and friction welding
- 2018Optical coherence tomography for laser transmission joining processes in polymers and semiconductors
- 2018Advanced high pressure turbine blade repair technologies
- 2018Robot based remote laser cutting of three-dimensional automotive composite parts with thicknesses up to 5mm
- 2018Tribological study on tailored-formed axial bearing washerscitations
- 2017Chip bonding of low-melting eutectic alloys by transmitted laser radiation
- 2017Investigations on remote laser beam welding of dissimilar joints of aluminum alloys and steel with varying sheet thicknesses for car body constructioncitations
- 2016Laser soldering and brazing of steel-aluminum sheets for tailored hybrid tubescitations
- 2016High-power laser welding of thick steel-aluminum dissimilar joints
- 2016Laser processing of carbon fiber reinforced plastics - Release of carbon fiber segments during short-pulsed laser processing of CFRP
- 2016Investigations on laser beam welding of different dissimilar joints of steel and aluminum alloys for automotive lightweight construction
- 2016Significance of the resonance condition for controlling the seam position in laser-assisted TIG welding
- 2015Design, processing, and characterization of nickel titanium micro-actuators for medical implantscitations
- 2014Investigations on laser beam welding dissimilar material combinations of austenitic high manganese (FeMn) and ferrite steels
- 2014Laser-GMA hybrid welding of API 5L X70 with 23 mm plate thickness using 16 kW disk laser and two GMA welding power sourcescitations
- 2014Crack repair of single crystal turbine blades using laser cladding technology
- 2014Laser cutting of carbon fiber reinforced plastics-investigation of hazardous process emissions
- 2013Adaptable orthopedic shape memory implants
- 2009Seam-tracking for high precision laser welding applications—Methods, restrictions and enhanced conceptscitations
Places of action
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article
Investigations on the effect of standing ultrasonic waves on the microstructure and hardness of laser beam welded butt joints of stainless steel and nickel base alloy
Abstract
<jats:p>Joining dissimilar metals with superior quality is important to provide tailored, lightweight, and cost-efficient components. Expensive and durable materials are exceptionally used where the cheaper material would not withstand the requirements. With laser beam welding, dissimilar metals can already be joined with high precision, low heat input, and a customizable mixing degree. Introducing ultrasonic excitation into the weld pool is a promising approach for further improvements like customizing the solidification morphology and avoiding weld defects. The experiments are carried out with round bars of 30 mm diameter made of 1.4301 steel alloy and 2.4856 nickel base alloy. Ultrasonic-assisted laser beam butt welding is conducted on rotating specimens with a laser beam power of 7.75 kW and a welding speed of 0.95 m/min. The specimens are evaluated by metallographic cross sections, hardness measurements, and energy-dispersive x-ray spectroscopy (EDX). The ultrasound is used to excite an eigenmode of the sample and the weld position is varied at stress- and displacement-nodes. Two different mechanisms of acoustic grain refinement are revealed. Heterogeneous nucleation is fostered in weld seams that are positioned in stress-nodes, and the fragmentation of dendrites is fostered in displacement-nodes. The welds' chemical compositions correspond to the change of solidification morphology.</jats:p>