In the case of welding with electrofusion fittings, the parameters used are temperature and time. The parameters are written on the product label and read automatically by the electrofusion device. Although it is an even simpler procedure than butt welding, several important factors must considered, including:
- correct cutting of the pipe ends and marking on them the insertion length in the fitting;
- scraping the outer surfaces of the elements to be joined to remove the oxidized surface layer;
- cleaning the joint surfaces of foreign bodies and especially lubricants, using special solvents;
- cooling must be done naturally according to the time marked on the fitting label.
Electrofusion welding uses automatic welding machines with barcode reader, and the realization of these welds requires well-qualified personnel.
Injection moulded fittings for butt welding
Joining with butt fittings is the most common permanent joint technology used. Injection moulded fittings for butt welding depend on the base material of the pipe (fittings) and the standard dimensional ratio (SDR), and are made available by the manufacturers of welding equipment.
The principle of this method is based on the phenomenon of fusion. Basically, this involved heating the surfaces to be joined for a certain period of time. Then, the two surfaces are pressed onto each other at a set pressure and for a well-defined period of time, so that the molten material fuses to form a single structure. This phase is followed by a cooling phase.
Welding parameters are therefore time, pressure and temperature..
Injection moulded fittings for butt welding depend on the base material of the pipe (fittings) and the standard dimensional ratio (SDR), and are made available by the manufacturers of welding equipment. See also HDPE water pressure pipes and fittings.
PE compression fittings
Compression fittings offered by TeraPlast are manufactured within the dimensional range 20 - 110mm, with a relatively wide field of use.
The most common field of use of compression fittings is the water network repairs. Their use is possible even for indoor installations and technological pipes. They are most often used in the area between the network connection and the building.
We recommend paying special attention to the fittings used to make the connections (see the presentation of the components of this range).
Compression fitting is the simplest of the polyethylene pipe joining technologies. This technique allows the joining of hundreds of meters of pipe network with an increased and very economical efficiency, especially the one delivered in coils.