FG Verfahren und Technologien für hochbeanspruchte Schweißverbindungen

6 Items

Recent Submissions
Experimental Determination of the Emissivity of Powder Layers and Bulk Material in Laser Powder Bed Fusion Using Infrared Thermography and Thermocouples

Mohr, Gunther ; Nowakowski, Susanna ; Altenburg, Simon J. ; Maierhofer, Christiane ; Hilgenberg, Kai (2020-11-20)

Recording the temperature distribution of the layer under construction during laser powder bed fusion (L-PBF) is of utmost interest for a deep process understanding as well as for quality assurance and in situ monitoring means. While having a notable number of thermal monitoring approaches in additive manufacturing (AM), attempts at temperature calibration and emissivity determination are relat...

Numerical and Experimental Investigation of Controlled Weld Pool Displacement by Electromagnetic Forces for Joining Dissimilar Materials

Heßmann, Jennifer ; Bachmann, Marcel ; Hilgenberg, Kai (2020-10-29)

In order to reduce CO2 emissions, an increasing interest in lightweight construction exists in the automotive industry, especially the multi-material-design approach. The main construction materials here are steels and aluminium alloys. Due to their different physical material properties and limited mutual solubility, these two materials cannot be joined thermally without difficulty. This paper...

Separation of the Formation Mechanisms of Residual Stresses in LPBF 316L

Ulbricht, Alexander ; Altenburg, Simon J. ; Sprengel, Maximilian ; Sommer, Konstantin ; Mohr, Gunther ; Fritsch, Tobias ; Mishurova, Tatiana ; Serrano-Munoz, Itziar ; Evans, Alexander ; Hofmann, Michael ; Bruno, Giovanni (2020-09-14)

Rapid cooling rates and steep temperature gradients are characteristic of additively manufactured parts and important factors for the residual stress formation. This study examined the influence of heat accumulation on the distribution of residual stress in two prisms produced by Laser Powder Bed Fusion (LPBF) of austenitic stainless steel 316L. The layers of the prisms were exposed using two d...

In-Situ Defect Detection in Laser Powder Bed Fusion by Using Thermography and Optical Tomography—Comparison to Computed Tomography

Mohr, Gunther ; Altenburg, Simon J. ; Ulbricht, Alexander ; Heinrich, Philipp ; Baum, Daniel ; Maierhofer, Christiane ; Hilgenberg, Kai (2020-01-09)

Among additive manufacturing (AM) technologies, the laser powder bed fusion (L-PBF) is one of the most important technologies to produce metallic components. The layer-wise build-up of components and the complex process conditions increase the probability of the occurrence of defects. However, due to the iterative nature of its manufacturing process and in contrast to conventional manufacturing...

Simulationsgestützte Einflussanalyse der Eigenspannungs- und Verzugsausbildung beim Schweißen mit artgleichen und nichtartgleichen Zusatzwerkstoffen

Neubert, Sebastian (2018)

Die Hauptanliegen dieser Arbeit bestehen darin, den Einsatz der Schweißstruktursimulation durch eine Reduzierung des werkstoffbezogenen Modellierungsaufwandes zu fördern und einen Beitrag zum Verständnis der Anwendung von hochfesten hochlegierten Zusatzwerkstoffen beim Verschweißen hochfester, niedriglegierter Feinkornbaustähle zu liefern. Im Fokus stehen dabei numerische Einflussanalysen zur A...

High Power Laser Beam Welding of Thick-walled Ferromagnetic Steels with Electromagnetic Weld Pool Support

Fritzsche, André ; Avilov, Vjaceslav ; Gumenyuk, Andrey ; Hilgenberg, Kai ; Rethmeier, Michael (2016)

The development of modern high power laser systems allows single pass welding of thick-walled components with minimal distortion. Besides the high demands on the joint preparation, the hydrostatic pressure in the melt pool increases with higher plate thicknesses. Reaching or exceeding the Laplace pressure, drop-out or melt sagging are caused. A contactless electromagnetic weld support system wa...