Welding equipment for welding of polyethylene and polypropylene pipes

For welding of polyethylene and polypropylene pipes the set of welding machines is used: from manual devices for bell-shaped welding to semiautomatic devices and automatic machines with the hydraulic drive, for butt welding.

Three main ways of welding of plastic pipes - butt, elektromuftovy and bell-shaped welding are known.

At butt welding end faces of pipes are melted off and interfaced under pressure. Then the thermoelement is cleaned, densely pressing to each other pipe end faces until they cool down. Devices for butt welding of pipes allow to receive a strong and qualitative welded seam therefore this way of welding remains demanded in Russia and abroad. By the way, by means of special tools the seam can be removed. Quality of the welding depends on the applied equipment and qualification of experts which serve cars for butt welding.

By means of butt welding pipelines of big diameters are under construction: beginning from 63 mm, finishing with diameters of 1600 mm., which are used for oil, gas supply, water disposal, water supply and other purposes.

As practice shows, the best quality of welding is reached when using the European devices for butt welding of pipes. In particular, our company delivers the German Hürner equipment which deserved the excellent job a set of positive responses worldwide on the territory of Siberia and the Far East. This equipment can easily be used in the conditions of a building site. For example, to weld plastic pipes on the Earth's surface, and then to lay them in the prepared trench, or to carry out welding directly to trenches. Also the equipment for work in shop did not remain unaddressed. So-called shop cars for production of welded shaped parts (fitting). By means of such equipment, a welding method at an angle, it is possible to make welded polyethylene branches, tees, crosspieces, etc.

simple, technically, mechanical devices for butt welding polyethylene serve, generally for welding of pipes of small diameters. Devices for butt welding with the hydraulic drive are more technological, can have manual, semi-automatic and automatic control. Semiautomatic devices and automatic machines exercise control over welding process, conduct it according to the special program put in the device.

To mount pipelines from polypropylene and polyethylene in hard-to-reach spots, for example in wells, most often apply elektromuftovy (elektrofuzionny) welding. Devices of elektromuftovy welding differ in small weight and can be used in the conditions of the squeezed space. Welding is carried out by heating of a spiral of a fitting (coupling) therefore the inside is melted off and pressurizes a joint. The fitting for the device of elektromuftovy welding is defined proceeding from diameter of a pipe and pressure in system. There is a kind of these devices: devices of elektromuftovy welding with recording and devices of elektromuftovy welding without recording. Recording of welding processes is necessary for welding of gas pipelines.

Bell-shaped welding is widely used method for assembly of plastic pipelines, generally polypropylene, systems with use of a cast fitting, with a diameter up to 125 mm. The principle of a welding cycle, is similar to butt welding, but there is a difference in the field of welding.

Phase of heating of external part of a pipe and internal part of a fitting, and then their data - the main difference of bell-shaped welding from butt.

The fitting and pipe are heated a special "soldering iron for polypropylene pipes" during the determined time then the heated nest/plug of the tool is removed, and the pipe is inserted into a fitting. The pipe and a fitting are left during certain time to cool down.

Depending on diameter of a pipe, welding can be carried out or manually, or to carry out on mechanical devices of bell-shaped welding.