Abstract: Objective Dissimilar metals connection structure between alloy iron and copper alloy can simultaneously utilize excellent properties of both metals, which has a wide range of application prospects. This paper aimed to obtain iron/copper welded-brazed joints with excellent performance and provide data support for their application. Methods DT4 electrical pure iron and QCr0.5 chromium bronze were selected as base material in this paper, furnace vacuum welding-brazing was used to connect DT4 electrical pure iron and QCr0.5 chromium bronze. Microstructure and element diffusion at the connection interface were analyzed by optical microscopy and scanning electron microscopy, and mechanical properties of welded-brazed joints were evaluated through hardness and shear strength of welded-brazed joints. Results The results showed that iron/copper welded-brazed joints could be obtained by furnace vacuum welding-brazing process. A clear diffusion layer with a width of about 30 μm was formed at the interface of welded-brazed joints, which was composed of uniform diffusion of Cr and non-uniform diffusion of Cu. Diffusion of Cr had a strengthening effect on DT4, which increased strength and hardness of ferrite. Hardness of diffusion layer at the interface was significantly higher than that of base material on both sides, and it had the highest hardness and further enhanced metallurgical bonding at the interface. Conclusion Average shear strength of welded-brazed joints was 146.2 MPa. Fracture occurred in QCr0.5 base material, which was a ductile fracture mode. Metallurgical bonding quality of welded-brazed joints was good.