Hot Mandrel Bending or „The Hamburg“ is a process for forming seamless pipe elbows with nearly constant wall thickness, commonly used for the Oil and Gas Industry. To create these pipe elbows a pipe section is heated inductively and a hydraulic press is used to force the pipe sections over the horn shaped mandrel. The geometry of these tools is currently still determined by the experience of the engineer. As the mandrels are the main cost driver, an insufficient design of the tool, which leads to deviating elbow shapes and varying wall thickness, has to be avoided. Therefore, a prediction of the effects of varying process parameters like mandrel geometry, pipe geometry and temperature on the final product would be beneficial. Thus, a finite element model of “The Hamburg” is established in this thesis and the influence of process variations on wall thickness and effective strain is analysed.