Characterizing the strength of support-model connection in the case of laser powder bed fusion technology by torsion test

•Support and model connectivity is characterised in additive manufacturing.•Torsion test is developed for 3D printed metal samples.•316L and Ti6Al4V materials were investigated and characterised.•Support and teeth parameters affect the connectivity strength. Additive manufacturing of metal parts was investigated in this research work, which connects to the models' supports. The connection between the support and the model has a high impact on the mechanical fixturing, the heat conduction, the removability of the support and the success of printing. In this research work, some support and tooth parameters such as the top length, the hatch distance, and Z offset were investigated to create a model-support connection strength map. This knowledge makes it possible to select the most appropriate connection type between the support and the model by the requirements specified in different cases. The strength of the support-model connection was characterized by the shearing properties using the torsion test. The results are illustrated and compared by different support parameters and materials. The 316L stainless steel and Ti6Al4V alloy were investigated. Different failure modes were determined depending on the chosen parameters.