The polymer reptation concept explains the enhancement of interfacial strength in linear polymers by attributing it to chain diffusion across the filament interface. Polymer chains diffuse with a welding time dependence of tw 1/4 up to gyration radius before reaching saturation at the bulk value. To evaluate the applicability of this theory on branched polymers, we analyzed the interfacial layer thickness and welding strengths based on CGMD simulations.