| 摘要 |
PURPOSE:To obtain a uniform welded state at the time of welding to a synthetic resin pipe, by a method wherein a heating element is arranged on a fixed part of an inner circumferential part of a joint body and a part of an inner circumferential surface of an end part where the heating element is not arranged is formed into almost the same diameter as the inside diameter of the heating part. CONSTITUTION:An end pert of a synthetic resin pipe P is inserted inside a joint body 1. Then a heating element 3 is heated and thermoplastic resin of the circumference of the heating element, that is, an inner circumferential part of the joint body 1 and an outer circumferential part of the synthetic resin pipe P are melted. In this instance, since the heating element 3 is not arranged, both end parts 16 of the joint body are not melted. Moreover, since at least a part of the inner circumferential surface of its end part is formed into almost the same diameter as the inside diameter of a heating part 1a, even if resin of the circumferential part of the heating element is melted, shifting of the heating element is prevented by the same diametral part by becoming a stopper. Therefore, uniform arrangement state of the heating element can be held even after the melting. |
