Rührreibschweißen - Herausforderungen bei Anwendungen für die Elektromobilität. - In: DVS Congress 2020, (2020), S. 849-854
Einfluss des Verhältnisses aus Drehrichtung und Geschwindigkeit am FSW-Werkzeug auf die Ermüdungsfestigkeit von Al-Legierungen. - In: DVS Congress 2020, (2020), S. 608-615
Tragfähigkeit von Stumpfnahtverbindungen höherfester Stähle im Stahlbau. - In: DVS Congress 2020, (2020), S. 557-563
Laserstrahlauftragschweißen - Steigern der Produktivität beim gepulsten Schweißen von Nickelbasis-Superlegierungen. - In: DVS Congress 2020, (2020), S. 517-523
Influencing microstructure of vanadium carbide reinforced FeCrVC hardfacing during gas metal arc welding. - In: Metals, ISSN 2075-4701, Bd. 10 (2020), 10, 1345, insges. 11 S.
Vanadium carbide (VC) reinforced FeCrVC hardfacings have become important to improve the lifetime of tools suffering abrasive and impact loads. This is because the microstructural properties of such hardfacings enable the primary VCs to act as obstacles against the penetrating abrasive. Because dilution is supposed to be the key issue influencing the precipitation behaviour of primary carbides during surfacing, the development of deposit welding processes exhibiting a reduced thermal impact, and hence lower dilution to the base material, is the primary focus of the current research. By inserting an additional hot wire in the melt, an approach was developed to separate the material and energy input during gas metal arc welding (GMAW), and hence realised low dilution claddings. The carbide content could be increased, and a grain refinement was observed compared with conventional GMAW. These effects could be attributed to both the reduced dilution and heterogeneous nucleation.
https://doi.org/10.3390/met10101345
Fatigue behavior of conventional and stationary shoulder friction stir welded EN AW-5754 aluminum alloy using load increase method. - In: Metals, ISSN 2075-4701, Bd. 10 (2020), 11, 1510, insges. 11 S.
https://doi.org/10.3390/met10111510
Thermal efficiency in laser-assisted joining of polymer-metal composites. - In: Materials, ISSN 1996-1944, Bd. 13 (2020), 21, 4875, insges. 16 S.
https://doi.org/10.3390/ma13214875
Statistical analysis of pulsed laser beam welding repair strategies of nickel-base superalloys. - In: 11th CIRP Conference on Photonic Technologies [LANE 2020], (2020), S. 638-643
Pulse shaping is a suitable option to adapt energy input and temperature gradients in the base material during filler wire assisted laser beam welding, although the influence on the temperature-depended microstructure and γ-precipitation strengthening of Nickel-base superalloys as well as the process windows are not sufficiently understood so far. Therefore, the influence of pulse parameters, preheating temperature, hot-wire heating power and wire feeding rate on the deposition process and the resulting macro- and microstructure of similar Nickel-base superalloy joints of Inconel 738 low carbon (IN 738 LC) with Haynes (HS 282) filler are investigated. The statistical analysis of the multidimensional parameter space with respect to the geometric properties of the weld seams (dilution, aspect ratio and wetting angle) and hot-crack formation revealed high reliability and predictability concerning individual choice of suitable parameters in field repair application.
https://doi.org/10.1016/j.procir.2020.09.099
Effect of reduced ambient pressure and atmospheric composition on material removal mechanisms of steel and aluminum by means of high-speed laser processing. - In: 11th CIRP Conference on Photonic Technologies [LANE 2020], (2020), S. 487-492
Balancing processes require highly precise mass corrections especially in case of high-speed turning rotors. Material removal by means of cw-mode laser radiation represents a novel approach for industrial balancing applications in order to achieve sufficient removal rates. Thereby, spatter formation was identified as primary removal mechanism. In this study, the effect of reduced ambient pressures and atmospheres with varying concentrations of argon, nitrogen and oxygen on spatter formation and loss of mass were investigated for AISI304 (1.4301, X5CrNi18-10) and EN AW-2618 (DIN 3.1924) under the use of a 400W single mode-fiber laser.
https://doi.org/10.1016/j.procir.2020.09.169
Acoustic process monitoring in laser beam welding. - In: 11th CIRP Conference on Photonic Technologies [LANE 2020], (2020), S. 763-768
Structure-borne acoustic emission (AE) measurement shows major advantages regarding quality assurance and process control in industrial applications. In this paper, laser beam welding of steel and aluminum was carried out under varying process parameters (welding speed, focal position) in order to provide data by means of structure-borne AE and simultaneously high-speed video recordings. The analysis is based on conventionally (e.g. filtering, autocorrelation, spectrograms) as well as machine learning methods (convolutional neural nets) and showed promising results with respect to the use of structure-borne AE for process monitoring using the example of spatter formation.
https://doi.org/10.1016/j.procir.2020.09.139