Deformability of WC–Co sinters and 17-4 PH steel brazed joints

Tests of the vacuum brazing joints of WC–Co sinters and age-hardened steels of the 17-4 PH using the Cu solder were carried out. Stresses and strains of the joints have been analysed. The joints have been used in large dimension spinning nozzles of a die for polyethylene granulation, in that considerable strength and ductility of the joints are required. Shearing tests of the joints have been executed on specimens done in the spinning nozzle brazed joint model. The results of mechanical properties of the joint tests were a base for the fooling them numerical investigations. 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 an essential influence on the values of the local stress and the significant influence on the joint rigidity. In a case of the considered joints the values of the local stress differences have been considerable (a few hundred percent) in dependence of a fixed load manner.