Generation of optimized intensity profile by diffractive elements for high power laser welding applications. - In: EOS Topical Meeting on Diffractive Optics 2017, (2017), S. 43-44
Übertragbarkeit der Prozessgrößen beim Diffusionsschweißen in Abhängigkeit von der Bauteilgeometrie und den Erwärmungsbedingungen. - In: Schweissen und Schneiden, ISSN 0036-7184, Bd. 69 (2017), 11, S. 758-764
Wirtschaftliches Auftragschweißen von Verschleißschutzschichten durch den Einsatz von Zusatzheißdraht. - In: Schweissen und Schneiden, ISSN 0036-7184, Bd. 69 (2017), 11, S. 766-772
Effizientes MSG-Fülldraht-Auftragschweißen mit magnetisch beeinflusstem Lichtbogen. - In: Schweissen und Schneiden, ISSN 0036-7184, Bd. 69 (2017), 10, S. 706-711
Additive Fertigung von temperierten Großwerkzeugen mittels Lichtbogen- und Diffusionsschweißtechnik. - In: VDWF im Dialog, ISSN 1860-4935, (2017), 2, S. 31-33
Additive Fertigung von temperierten Großwerkzeugen mittels Lichtbogen- und Diffusionsschweißtechnik. - In: Technomer 2017, (2017), S. 105
Prevention of solidification cracking during pulsed laser beam welding. - In: Proceedings in applied mathematics and mechanics, ISSN 1617-7061, Bd. 17 (2017), 1, S. 405-406
https://doi.org/10.1002/pamm.201710172
Reparatur von Bauteilen aus Nickellegierungen. - In: Schweissen und Schneiden, ISSN 0036-7184, Bd. 69 (2017), 10, S. 712-718
Im Rahmen dieses Beitrags werden experimentelle Untersuchungen zur laserbasierten Reparatur von Turbinenschaufeln aus Nickelbasis-Superlegierungen mit drahtförmigen und γ'-ausscheidungshärtenden Schweißzusatzwerkstoffen vorgestellt. Durch den Einsatz einer pulsmodulierbaren Laserstrahlquelle kann die artgleiche Reparatur bei Raumtemperatur ohne das Auftreten von Heißrissen ausgeführt werden.
Reduction of the spatter formation due to the use of superposition of two laser intensities. - In: Lasers in Manufacturing 2017, (2017), insges. 4 S.
New developments of laser system technology result in an increased power output at better beam quality. However, available laser power cannot always be transferred to increase the processing speed since imperfections such as the formation of spatter occurs, especially in the range of 5 m/min to 20 m/min for fiber and disk lasers. The appearance of spatter is strongly connected to the conditions in and around the capillary. This paper shows an experimental approach to reduce the spatter formation by using two laser spots. The experimental trails were executed with austenitic steel (1.4301) sheets using a high power disk laser and a diode laser. The modification of the resulting intensity reduces the loss of mass. High speed camera footage shows a different behavior of the weld pool due to the additional laser spot. Moreover, metallurgical cross-sections demonstrate the influence of the approach on the shape of the melt pool and the resulting weld seam.
Repair of nickel-based superalloys by pulsed Nd:YAG welding with wire feeding. - In: Lasers in Manufacturing 2017, (2017), insges. 5 S.
In this paper deposition of IN 625 filler wire on γ-hardened IN 738 superalloy with pulsed laser beam welding was investigated. High-speed observation was performed to examine the influence of the spatial and temporal alignment between the pulsed laser beam and the wire feeder on the material transition from the solid wire onto the substrate. The deposition process has shown to be extremely sensitive to the wire position and orientation relative to the melt pool. To obtain stable and repeatable welding conditions influence of the significant parameters, such as the wire feed rate, the energy input, and the traverse speed should be attentively considered. Significant improvements of the process stability could be achieved with the adjustment of the wire position in the negative z-direction. The preliminary results showed the potential of this approach as an alternative automated or partially automated repairing method for worn turbine components made of nickel-based superalloys.