| 摘要 |
A conduction welding apparatus, a mandrel, and method for bonding abutted thermal plastic tubular end portions (A,B) particularly suitable for welding PFA wherein a preferred embodiment, a folding weld head (224) embraces the abutted tubular end portions (A,B) to be welded, each tubular end portion including a flange spaced from the surfaces to be joined, the weld head including means for securing the flanges within the weld head (224) and further include bias means, the bias means providing an inward axial bias on the adjoined tubular end portions when the tubular end portions are displaced axially outward from the weld head due to the expansion of the plastic during the weld process, the bias means in a preferred embodiment being substantially inoperative prior to the weld and providing bias, or a substantial increase in bias, when the flanges are displaced due to the expansion of the molten PFA during the weld process, the mandrel comprising a first core portion (320) and a second tubing contact portion (322), the first core portion and the second tubing contact portion being longitudinally movable relative to each other between a first conjoining configuration and a second removal configuration. <IMAGE> |
