Abstract: The dynamic fusion welding problem of switching electrical appliances caused by the rebound arc during the contact closing process directly affects the electrical life and reliability of high-power contactors. In this paper, Cu-W interpenetrating-phase composites with cube and rhombic dodecahedron W skeletons were designed and fabricated. The dynamic contact flow model and condensation cooling mathematical model of contact pool flow were established in view of the arc, molten pool, droplet sputtering and solidification phase change cooling in the process of contact dynamic fusion welding. Moreover, the melting temperature distribution, molten pool splash morphology and metal solidification process in the contact area of two studied composites were studied and compared to the commercial Cu-W composite. The fusion welding force was verified by the simulated fusion welding experimental platform. The results show that, by adjusting the three-dimensional interpenetrating ordered W skeleton, the melt pool diffusion and liquid metal splashing can be effectively suppressed, and the fusion welding force can be reduced, thereby improving the anti-fusion welding performance of Cu-W composites.