Definition - What does Butt Fusion mean?
Butt fusion is the process by which polyethylene (PE), PVC or HDPE pipes are joined together without additional fittings by rapidly bringing their ends together under pressure to form a homogeneous bond. This type of jointing is ideal for trenchless technology installations like pipe bursting, sliplining, directional drilling, etc.
Trenchlesspedia explains Butt Fusion
Using butt fusion for joining pipes and fusing joints and fittings creates a bond that is capable of withstanding similar tensile stress and internal pressure parameters as the PVC pipe itself. The process of butt jointing involves heating the ends of two PVC pipes until a fusible bead is formed, then pressing the ends together under pressure until the joint is fused. Butt fusion is used for joining pipes with a diameter of more than 63 mm. This method is suitable for either coiled or straight pipes. However, both pipes to be fused should be of the same diameter. Butt fusion can also be used to fabricate fittings, reducers, tees, and bends. Using this method allows for the assembling of long lengths of pipe, which can also be cut, tapped, connected, or installed as any other PVC pipe.