Electrofusion welding

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Electrofusion welding of an HDPE pipe

The electrofusion (HM) is used for connecting plastic pipes made of semi-crystalline thermoplastic (for example polyethylene , polypropylene , polybutene ). It is used in accordance with the DVS 2207 Part 1 regulations .

procedure

DVS 2207-1 describes the exact workflow for the welding process. In this process, pipes are brought into the thermoplastic state by means of a sleeve made of PE (polyethylene), PP (polypropylene) or PB (polybutene) in which a heating coil wire is embedded. The material of the socket is always suitable for the pipe material, since different plastics cannot be welded. In this thermoplastic state, the pipes and the socket are now connected under pressure.

application

Electrofusion welding is used, among other things, in gas and water supply. Here, plastic pipes with a diameter of OD 32 mm to OD 1200 mm are welded (OD = Outside Diameter). The DVS 2207-1 procedure is used by the certified welder according to the German Gas and Water Association GW 330. The GW 330 course is aimed at skilled workers from pipeline construction and supply companies, as well as at employees who can already demonstrate many years of professional experience in underground pipeline construction.

Pure DVS is used in container construction, ventilation construction, geothermal energy, district heating supply and in the disposal sector. In DVS 2207-1, a further distinction is made according to DVS 2212-1 into subgroups (UG):

  • UG I-9.1 - I-9.2 HM PE-HD ( polyethylene high density )
  • UG I-10 HM PP-H; PP-R; PP-B ( polypropylene PP )
  • UG I-11 HM PB ( polybutene PB )

License

The plastic welder with the license DVS 2207-1 with the corresponding subgroup is not allowed to weld in the public gas and water network. This is reserved for the plastic welder with the GW 330 license.

The extension test according to DVGW GW 330 must be carried out after one or three years in order to continue to be authorized to weld.

The extension test according to DVS 2207 must be carried out after one or two years in order to continue to be authorized to weld.

evaluation

These HM connections are assessed in accordance with the DVS 2202 Part 1, assessment group I, II or III.

See also

literature

  • J. Wenner: Help for the production and assessment of heating element butt welds and electrofusion welds on thermoplastic pipe and pipeline parts . Dortmund 2009, ISBN 978-3-00-028380-2 ( online ).
  • J. Wenner: Help for the production and assessment of heating element butt welds and electrofusion welds on thermoplastic pipe and pipeline parts . Including training DVD. 2nd Edition. Dortmund 2012, ISBN 978-3-00-037602-3 ( online ).

Web links

Footnotes

  1. ↑ Pipeline system Fusiotherm® climatherm - pipeline systems made of Fusiolen® PP-R , p. 48ff, aquatherm GmbH.