Based on computer numerically controlled (CNC) fusion processes, infrared (IR) fusion, conventional butt fusion and electrofusion provide consistent and repeatable fusion joints for HDPE piping.
In infrared fusion joining, the fusion areas of the components are heated without contacting the heater element, joined by pressure and verified by measuring material overlap distance.1
Conventional butt fusion also uses a heater element; however, the material is heated by direct contact with the element, and a specific and consistent computer controlled pressure is applied throughout the entire fusion process.
With electrofusion, the heating element is embedded in socket-style fittings and is heated through electrical resistance. By creating interference between spigot and socket, the heating of HDPE and the resulting material expansion work to create a homogenous bond between the socket and the spigot.
1. Georg Fischer Inc., IR Plus Infrared Butt Fusion Technology, Fi5266/4a (3.04).