Tensions and deformations of WC–Co cermets and 17-4 PH steel vacuum brazed joints

Analysis of the properties of WC–Co cermets and precipitation hardening stainless steel of 17-4 PH type vacuum brazed joints has been presented. The joints are used in a large-dimension-spinning nozzle for polyethylene granulation in that considerable strength and ductility of the joints is required. The results of mechanical properties of the joint tests were a base for further numerical investigation. Shearing tests of the joints have been done on specimens based on the spinning nozzle brazed joint model. They have been executed using a special shearing test device. Numerical calculation of tensions and deformations of the joints have been made by means of the finite element method of the ADINA system. Influence of the geometrical parameters of the joints like the connection thickness as well as a fixed load on stresses and displacements of the joints have been analysed. Results of the experimental test were the base for identification and verification of the theoretical model parameters. The thickness of the joints has essential influence on the values of local stress and the significant influence on the joint rigidity. In case of the considered joints, the local stress differences have been even a few hundred percent, depending on a fixed load manner.