| 摘要 |
A conduction weld apparatus and method for bonding abutted thermoplastic tubular end portions (55, 76) provides quick cycle time and is particularly suitable for welding PFA. A folding weld head embraces the abutted end portions (55, 76), and an insert (136) placed in the interior of the tubular end portions (55, 76) to prevent formation of an internal bead. In a preferred embodiment a layered heater portion (32) provides a narrow melt zone. In a preferred embodiment a wrap over the abutted end portions facilitates a smooth weld and isolates the heater portion (32) from the weld. In another preferred embodiment, the weld head includes plastic clamps (50, 52) to secure the tubular end portions (55, 76). Such preferred embodiments operated synergistically to provide a highly efficient means for welding PFA tubular end portions (55, 76). |
