Georg Fischer Rohrleitungssysteme Ag

Georg Fischer Aktiengesellschaft

Hans-Werner Steinmetz

Dirk Alexander Petry

Fritz Reich

Helmut Hilger

In a process for the connecting of plastic tubes the wall of which has a corrugated cross section by electro-thermal welding, filling cores of plastic are inserted in the corrugation troughs of the tubes to be connected on both sides of a welding joint in order to form a resting surface on the outer circumference of the tubes and an electric heating mat which surrounds the resting surface of all filling cores is placed on the resting surface.

Process and means for welding corrugated tubes and/or compound tubes and

A molded part has welding sleeve portions (2) which are each provided with a heating coil (3a, 3b) for joining to tubular parts. A cylindrical sleeve end part (7) can be tensioned by at least one tensioning system against the inserted tubular part, thus providing fixing and holding of the parts before welding and during welding.

Molded part made of thermoplastic material

An adapting piece of thermoplastic material includes at least one welding sleeve portion with an electrical heating device formed by two heating mats arranged next to each other in circumferential direction. The welding sleeve portion has at least one radial incision extending in axial direction. By means of a clamping nut, the welding sleeve portion can be braced together with the heating elements against a tubular piece inserted in the welding sleeve portion. As a result, the pieces are fixed and supported before and during welding.

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Hans-Werner Steinmetz