What is butt fusion (hdpe welding) ?
Butt fusion is a thermofusion process which involves the simultaneous heating of the ends of two pipe/fitting components which are to be joined, until a molten state is attained on each contact surface.
The two surfaces are then brought together under controlled pressure for a specific cooling time and a homogeneous fusion joint is formed. The resultant joint is fully resistant to end loads and has comparable performance under pressure to the pipe itself.
An electrical heater plate is used to raise the temperature of the pipe ends to the required fusion temperature.
Butt-fusion can be used to join both PE80 and PE100 materials for pipe sizes of 90mm and above of the same SDR.
The butt welding machines used to weld PE pipes have controls to ensure the welding parameters are strictly adhered to. The following parameters are controlled:
- heater plate temperature
- ovality and alignment
- interface pressure
- bead width
- heat soak time
- changeover time
Control of these is necessary to ensure premature failure of the weld does not occur. The field conditions under which PE pipe is welded have a considerable effect on the strength of the joint. In order to achieve an acceptable weld three elements are essential:
- Cleanliness: because contamination will ruin joints
- Technique: Most owners of PE pipe systems require that people performing butt welding of PE pipes are qualified by completing a recognised training course
- Correctly designed equipment with proper maintenance: Correct welding temperatures, welding procedures and pipe facing tools must be maintained in tolerance and in good condition.
The resulting joint, if it has been properly made, is as strong as the original pipe and can withstand all the loads applied during routine installation and operation.
During the fusion process internal and external ‘weld beads' are formed. Techniques have been developed to minimise the size of the beads, however as they do not add anything to the overall strength they may be safely removed if required. The removed weld beads can be inspected as part of a quality control programme.
ISO 12176-1:2006 Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems - Part 1: Butt fusion
Related keywords : hdpe pipe sizes, hdpe welding, what is butt, hdpe pipe fusion,butt fusion, butt fusion machine, hdpe pipe welding, how to fuse hdpe pipe, pe fusion machine, welding poly pipe, polyethylene fusion machines, hdpe pipe fusion specifications, plastic pipe fusion welding machine, polyethylene welding temperature, butt welding procedure, poly pipe welding course, hdpe fusion welding machine, butt pipe, weld polyethylene, welding hdpe pipe, hdpe pipe welder, pe welding machine, pipe fusion tools, hdpe fusion welding, hdpe welding machine, hdpe butt fusion, poly welding machines, hdpe pipe jointing method, hdpe welding procedure, hdpe pipe welding machine, fusion welding hdpe, hdpe pipe fusion welding machine, hdpe fusion, hdpe butt fusion welding machine, poly pipe welding machines, pe welding, hdpe pipe fusion machine, how to weld hdpe pipe, how to weld water pipe, butt fusion welding, fusion welding plastic pipe, how to join hdpe pipe, hdpe butt welding machine, how to weld hdpe