HDPE Electrofusion is a method of joining PE, HDPE and other plastic pipes using special fittings that have built-in electric heating elements which are used to weld the joint together.

The pipes to be joined are cleaned, inserted into the electrofusion fitting (with a temporary clamp if required) and a voltage, normally 40V is applied for a fixed time depending on the type, and size of the fitting in use. The built in heater coils then melt the inside of the fitting and the outside of the pipe wall, which weld together to form a very strong homogeneous joint. The assembly is then left to cool for a specified time. Then it's done.

In the electro fusion process a heating wire permanently mouled into the fitting gets heated by current at a low voltage. The surrounding material around the wire gets melted and expands due to the warming. The melt starts closing the gap between pipe and fitting, leading to a heat transition to the pipe which also gets heated and melts in the welding zone. The pipe material also expands.

The increasing material expansion between pipe and fitting, which is hindered by the cold zones outside the welding zone, leads to a build up a welding pressure between pipe and fitting and a homogeneous welding connection emerges.