초록 ▼

An inner-less electrically weldable pipe joint has a hollow cylindrical pipe joint body of a thermoplastic material and a resistance heating wire coil surrounded by the pipe joint body. The wire is partly exposed to an hollow interior of the pipe joint body and partly embedded in an inner surface of

An inner-less electrically weldable pipe joint has a hollow cylindrical pipe joint body of a thermoplastic material and a resistance heating wire coil surrounded by the pipe joint body. The wire is partly exposed to an hollow interior of the pipe joint body and partly embedded in an inner surface of the pipe joint body. During the welding operation, the material of the welding zone of the pipe joint and the pipes being connected is readily and selectively heated by the heat from the exposed wire, there by enhancing the welding strength and shortening the welding time. Also, described are methods of producing such an inner-less electrically weldable pipe joint.

대표청구항 ▼

[ What is claimed is:] [1.] An inner-less electrially weldable pie joint comprising a hollow cylindrical pipe joint body of a thermoplastic material and a resistance heating wire surrounded by said pipe joint body, wherein said wire is partly exposed to a hollow interior of said pipe joint body and

[ What is claimed is:] [1.] An inner-less electrially weldable pie joint comprising a hollow cylindrical pipe joint body of a thermoplastic material and a resistance heating wire surrounded by said pipe joint body, wherein said wire is partly exposed to a hollow interior of said pipe joint body and partly embedded in an inner surface of said pipe joint body, wherein a portion where said wire is partly exposed to said hollow interior and a portion where said wire is partly embedded in the inner surface occur alternately along a circumferential direction on the inner surface of said pipe joint body.