The BCF fusion machine guarantees high reproducibility of fusion weld quality, even for on-site fusion. An external heating unit causes the material to flow into the fusion zone without changing the material property. A bladder positioned in the fusion zone produces a bead and crevice-free fusion weld. The machine covers the PVDF (SYGEF) and PP-n (PROGEF Natural) material in the dimension range of d20 mm up to d110 mm.