The working principle of an electrofusion joint is based on the resistance heating effect. A resistance wire is pre-embedded inside the electrofusion joint. When electricity is applied to the electrofusion joint, current flows through the resistance wire. Due to the resistance, electrical energy is converted into heat energy, causing the resistance wire to heat up. As the temperature rises, the contact area between the electrofusion joint and the connecting pipe begins to melt. This melting occurs under a certain pressure, resulting in a tight fusion interface between the electrofusion joint and the pipe.
During the heating process, controlling parameters such as current and heating time is crucial. Excessive current or heating time may lead to over-melting of the material, affecting the fusion quality and even damaging the joint; while insufficient current or heating time may result in incomplete fusion, leading to insufficient joint strength. Once the appropriate heating time is reached, the power is stopped, allowing the fused area to cool and solidify under a certain pressure.
During the cooling process, molecules rearrange and form a strong bond, ultimately achieving a reliable connection between the electrofusion joint and the pipe. This connection method ensures good sealing and mechanical strength at the connection point, meeting the operational requirements of the piping system.
