Welding techniques



Heated tool butt-welding

With this kind of joint, also known as butt-sealing with heat reflectors, two plastic tubes are heated and joined together. This results in a homogeneous weld with a stuffed seam.

Advantages

  • Economical over long distances
  • No overmeasure on the pipe, ideal for drawing lines in
  • No additional connecting element required



Requirements

  • Assembly protected from bad weather
  • Qualified workers needed


Electrically welded sockets

The sockets are heated and welded to the surface of the pipe. Electrically welded sockets are available in sizes 20 to 400 mm. The well-designed range is rounded off with bends, tees, tapers and various transition pieces. Other system components allow outlets to be made on existing lines under pressure.

Advantage

  • Easy handling
  • Compatible with PEHD and PEMD
  • Integrated retaining device up to de 63 mm


Requirements

  • Assembly protected from bad weather
  • Qualified workers needed

 



Welding equipment
Hydraulically powered butt-welding machinery is used for heated tool butt-welding. Electrically welded sockets are processed with a multipurpose electric welding unit.


Welding courses
The Verband Kunststoffrohre und Rohrleitungsstelle (VKR) offers one-week specialist courses for welding and laying underground pipes. The courses are supported by the organisations SBV, SSIV, SVGW, VSA and a certificate is awarded to those who successfully complete the course.

Weld seam examinations
If the client demands weld seam examinations, these tests can be carried out on request in our laboratory.


Melt-flow index
The MFR (melt-flow index) indicates the viscosity of the plastic at processing temperature. For welding, the aim should be to obtain similar MFR values for the components.

Tolerance range 0.2 - 1.4 g/10 min, 190°/50N