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Item-typ:Veröffentlichung, Hybrid additive manufacturing with titanium powder and aluminum substrates via laser powder bed fusion(BIAS Verlag, 2022-11); ; ; ; For the thermal joining of aluminum and titanium, the approach of solely melting the aluminum joining partner, while the titanium partner stays in the solid form, has been commonplace since 1996. This is done to limit the formation of a brittle intermetallic compound layer in the interface. In case of additive manufacturing with titanium powder and aluminum substrates, this approach is not transferrable because the titanium powder has to be melted to create the part. In this study, titanium samples were additively manufactured onto aluminum substrates using a commercial laser powder bed fusion (LPBF) machine. The influences of the energy density during the process on the sample porosity, the characteristics of the interface between sample and substrate, as well as the interfacial tensile strength are analyzed. Despite the melting of both materials, a great potential for high interfacial tensile strength has been found.Wissenschaftlicher Artikel341 462 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Prevention of coating-induced agglomerations within the weld seam during laser beam deep penetration welding of aluminum-silicon coated press-hardened steel(BIAS Verlag, 2022-11); ; ; ; Press-hardened steels like 22MnB5 (1.5528) have great potential in terms of their use in the field of lightweight construction. However, due to the aluminum-silicon coating, applied for press-hardening, strength-reducing agglomerations can occur within the seam after laser deep penetration welding of already hardened material. To investigate the hypothesis that the agglomeration formation can be reduced by beam modulation strategies, laser deep penetration welding experiments with changing beam modulation strategies such as “transversal”, “circular” and “vertical eight” shaped patterns were carried out using constant welding speed and laser power. After comparing the resulting cross-sections to coated and decoated samples welded without beam modulation, the hypothesis was found to be true in case of all modulation strategies examined as no agglomerations could be detected within the samples. In addition, in case of the beam modulation strategies “circle” and “vertical eight”, the fracture type could be changed from a separation fracture along the melting line to a shear fracture crosswise to the seam in sheet metal plane comparable to the decoated samples.Wissenschaftlicher Artikel346 147 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Eigenschaften laserstrahlgefügter Mischverbindungen aus Aluminium und Titan in Abhängigkeit der Kantengeometrie und Halbzeugstruktur(2017-06-23); ; ; This work deals with the laser beam joining of aluminum and titanium as well as the joining of aluminum and CFRP using a titanium laminate edge. The aim was to achieve slim, lightweight and nevertheless high strength joints between these important material groups for use in future applications. The focus hereby is on the influence of the joining zone geometry on the joint strength as well as the failure behavior. The results show that the double-sided laser beam joining process enables based on a derived predictive model the specific targeted design of the titanium edge geometry without significantly influencing the interfacial compound layer properties. Using a wedge-shaped geometry of the titanium part, the failure of the joint could be reliably moved into the heat affected zone of the aluminum. The transfer to titanium laminates and titanium laminate edges shows a high potential of the joining concept for lightweight construction by using aluminum-CFRP joints with titanium transition structures.DissertationBand:0065742 481