Abstract: Abstract: Resistance butt welding is a highly efficient and low-cost solid-state bonding technology suitable for joining conductive materials. To achieve high-value utilization of cemented carbide recycled materials, this study systematically investigated, for the first time, the resistance butt welding process between WC-Co cemented carbide recycled materials and virgin materials. By comparing the joint morphology and composition of two typical recycled materials (A and B) with virgin material (C), the enrichment of Co and Ti elements in the weld zone was revealed, along with their positive effects on ensuring joint flexural strength and fracture toughness. To address the issue of molten zone formation during the welding of recycled material A, single-factor experiments using bending force as the evaluation criterion were designed to systematically investigate the influence of welding current and welding time on welding quality. The results showed that increasing welding current enhances joint strength but tends to induce molten defects, while appropriately extending welding time can achieve sound bonding while avoiding molten zones. The optimal process parameters were finally determined as follows: preheating current A_p=0.75kA, preheating time T_p=710ms, welding current A_w=2.05kA, welding time T_w=1150ms, and welding pressure P=0.4MPa. Under these parameters, the welded joint exhibited no surface defects, achieved a bending force of 296kgf, and could withstand a radial load of approximately 2960N, meeting the requirements for cutting tool applications. This study provides a reliable and efficient joining solution for the recycling and reuse of cemented carbide materials.