| 摘要 |
PURPOSE: To heat and melt not only the inner surface of an electric heating socket and the adjacent surfaces of pipe parts but also the pipe parts along a butt joint by heating the length range of the specific magnification of the outer diameter of a pipe measured from the butt joint by the electric heating socket and intensively heating a relatively narrow range as compared with a relatively wide range. CONSTITUTION: In welding plastic pipes, pipe parts 1, 2 to be welded are butted mutually and the relatively wide range 6 of which the length is about 0.2-1.0 times the outer diameter of the pipes measured from a butt joint 15 is heated by an electric heating socket 3 comprising plastic to weld both pipe parts. At this time, a relatively narrow range 5 is more intensively heated than the relatively wide range 6 and not only the inner surface of the socket 3 and the adjacent surfaces of the pipe parts 1, 2 but also the pipe parts 1, 2 along the butt joint 15 are heated and melted. By this constitution, the pipe parts along a gap can be welded and an electric heating element is exposed to the gap between the pipes to be prevented from corrosion. |
