PURPOSE: To prevent the deformation and heat deterioration due to oxidation of a heating melting section, and conduct butt welding properly and efficiently by keeping distances among each end face in a plurality of synthetic resin pipes constant by spacers and uniformly heating and melting each end face by heating plates disposed in a noncontact manner among the end faces.
CONSTITUTION: Each end section of a pair of pipes 2, 3, which must be welded and is composed of a synthetic resin, is held by a pair of chucks 6, 7 in a butt welding apparatus 1. A spacer 11 is interposed between each chuck 6, 7, and the spacer is moved by a driving device 12, thus setting a distance between the end faces of each pipe 2, 3. A heating plate 13 is interposed between the end faces of each pipe 2, 3 while forming a clearance, and the heating plate 13 is moved by a driving device, thus heating each end face under a noncontact state. At least one of each chuck 6, 7 is shifted by the driving device 15, and each end face heated end melted is pressure-welded mutually. On the other hand, each operation of the heating plate driving device and the chuck drive 15 is controlled by controllers respectively.
KODAMA KOICHI
KASHITATE TAKESHI
