DEVICE AND METHOD OF MELTING AND JOINING CONNECTING END SECTION OF PIPING SYSTEM PART

摘要

PURPOSE: To join two thermoplastic pipes without crack or undesired bead by holding wider area than the heated controlled area of the pipes to press the inside of pipes to outer direction using an inflatable bag. CONSTITUTION: Two pieces of plastic pipe including an inflatable bag 60 are abutted in their ends 201, 203 held by a U-shape binder 70 set with a heat- controllable mandrel 50. The central heating groove 67 and cooling grooves 87, 95 are formed on the mandrel 50 to heat the both end of the pipes over the melting temperature and keep the portion adjacent to the end under the melting temperature in order to prevent undesired deformation of pipes.