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1. (WO1979001000) METHOD AND APPARATUS FOR CONNECTING THERMOPLASTIC CONDUCTOR ELEMENTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/001000 International Application No.: PCT/CH1979/000059
Publication Date: 29.11.1979 International Filing Date: 26.04.1979
IPC:
B29C 65/00 (2006.01) ,B29C 65/34 (2006.01) ,F16L 47/03 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
65
Joining of preformed parts; Apparatus therefor
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
65
Joining of preformed parts; Apparatus therefor
02
by heating, with or without pressure
34
using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
47
Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
02
Welded joints; Adhesive joints
03
Welded joints with an electrical resistance incorporated in the joint
Applicants:
Inventors:
Priority Data:
4696/7828.04.1978CH
Title (EN) METHOD AND APPARATUS FOR CONNECTING THERMOPLASTIC CONDUCTOR ELEMENTS
(FR) PROCEDE ET APPAREIL POUR RACCORDER DES ELEMENTS CONDUCTEURS THERMOPLASTIQUES
Abstract:
(EN) The electrically welded junctions, which are used first of all for large diameter pipes, have, because of the contraction of junction body, a heating wire winding subjected to compression stress. Said compression stress and expansion consecutive to the welding operation may cause a lateral overflow and a contact with neighbouring spirals. The apparatus for welding such junctions avoids these inconveniences by dividing the total welding time of the junction (15) into a preheating time and into a welding time. During the preheating time, only a part of the power is used and during the welding time the total power is used. The welding power is drawn from an A.C. network thus, by arranging a diode (8) on the welding circuit (2), the welding operation may start with half of the power and, after the preheating time has elapsed, the diode is bridged by a switch stud (10).
(FR) Les raccords soudes electriquement, qui sont utilises avant tout pour des tubes de gros diametres, presentent a cause de la contraction du corps du raccord, un bobinage de fil de chauffe soumis a une contrainte de compression. Cette contrainte de compression et la dilatation consecutives a l"operation de soudage peuvent provoquer un deversement lateral et un contact avec les spires avoisinantes. L"appareil pour souder de tels raccords evite ces inconvenients en subdivisant le temps total de soudage du raccord (15) en un temps de prechauffage et en un temps de soudage. Pendant le temps de prechauffage, on travaille avec une partie de la puissance, et pendant le temps de soudage avec la puissance totale. La puissance de soudage est prelevee sur un reseau de courant alternatif, ainsi en disposant une diode (8) sur le circuit de soudage (2) l"operation de soudage peut debuter avec la moitie de la puissance, puis apres prechauffage, la diode est pontee avec un plot de commutation (10).
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)
Also published as:
US4334146