COMPLETE SET OF CONNECTING PARTS FOR WELDING OF PIPES MADE OF STRUCTURED (CROSS-LINKED) POLYETHYLENE AND METHOD OF THERMAL RESISTANCE WELDING OF PIPES OF STRUCTURED (CROSS-LINKED) POLYETHYLENE

摘要

The invention relates to the branch of building and repair of the conduits of networks of cold and hot water and heating, which transport water at a temperature from 5 DEGREE C to 95 DEGREE C. A complete set of connecting parts contains internal and external adapters, which are made of pipes of structured (cross-linked) polyethylene. Washers of polyethylene unstructured pipes are installed on processed annular end segments of internal connecting part. In the internal part of external connecting part an annular deepening is made by cutting, which ends from both sides with annular end lugs of the profile of mentioned component. Into the deepening by continuous winding is installed the article, which consists of metallic wire with high specific resistance and isolation made of unstructured compound of polyethylene. After assembling of complete set, before beginning welding, the bandage between two sections is installed, which are brought out to the external surface of external connecting part of said article, then is conducted thermal resistance welding of pipes of structured (cross-linked) polyethylene. The welding method consists in that the voltage is supplied on two plugs. Due to heating of metallic wire the isolation and washers made of polyethylene unstructured pipes pass into viscous-flow state and their fusions are mixed upbetween them, and also they interact with combinable components and parts of pipes made of structured (cross-linked) polyethylene to be welded. Then the bandage on external connecting part is maintained, moreover the time of holding of bandage is equal to the time of heating the mentioned article and time of cooling the complete set of connecting parts and sections of pipes made of structured (cross-linked) polyethylene, which are welded. The time of cooling of mentioned complete set ten times exceeds the time of heating of mentioned article. The complete set of connecting parts for welding the pipes of structured (cross-linked) polyethylene and method of thermal resistance welding of pipes of structured (cross-linked) polyethylene ensures uniform strength of welded joint with the pipes of structured (cross-linked) polyethylene, including with the pipes, which are made by different manufacturing methods of their cross-linking.