The combined metallic yielding device (CMD) is a passive yielding damping device with stable hysteresis, high stiffness, ductility, and energy dissipation capacity. CMD is commonly used in the seismic retrofitting of structures to reduce the seismic response and improve structural performance. The working principle of CMD is the combination of flexural and shear mechanisms under lateral loading. The primary components of CMD are two base plates, two flexural plates, one shear plate, and two shear tabs. The shear plate is attached to the base plate through shear tabs. The connection between the shear plate and shear tab could be welding or bolting. Both types of connection show a different mode of hysteresis response. Welding connection shows high initial stiffness with limited ductility due to premature tearing of the plate. In contrast, bolt connection shows lower initial stiffness and higher ductility and energy dissipation due to its tendency to delay the failure of thin web (shear) plates through bearing/tearing under in-plane lateral loading and distribute the bearing stresses at sufficient locations. Considering these facts, in this study, two different types of CMDs are taken into account, where the shear plates and shear tabs are connected by bolts and welding. To investigate the hysteretic response, load carrying capacity, and drift capacity, numerical models are created using Finite Element software. The numerical findings are compared with the experimental findings. This comparison indicates that connections between the shear plate and shear tab influence the performance of CMD. Overall, the study demonstrates the effectiveness of CMD and provides valuable insights into the design of CMDs.