Butt Welding of PVC (Fusible PVC)

While PVC connections are commonly made by a rubber seal joint, butt welding of PVC is promoted. This technique is specifically mentioned for applications such as directional drilling and slip lining. Photo 2 in the source illustrates butt welding for Fusible PVC and for PO.

Butt welding is contrasted with other jointing methods like rubber ring sockets or electro fusion couplers, with factors such as reliability based on required skills and environment, ease of handling, and the need for special equipment playing a role in their appreciation. For applications requiring tensile resistance of the joints, such as slip-lining or simply for long pipes in one piece, tensile resistant end-joints are required. This is necessary due to the Poisson effect, which causes pipes to shorten when the diameter increases under pressure. Butt welding provides the necessary tensile resistance for these applications.

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