The specification of pe hot-melt pipe fittings is only the measurement of inner diameter and outer diameter. For example, the specifications of PE hot-melt fittings you can choose are 40, 50, 63, 75, 90, 1 10, 125, 160 and so on. Then, the inner diameter and outer diameter of the PE hot-melt pipe fittings are 40×50, 50×63, 63×75, 75×90, 90×10, 10× 125 and 125 respectively. Electrofusion welding of PE pipe fittings is usually one-time welding, that is, welding with voltage from the beginning to the end. Some pipe fittings contain multiple groups of resistance wires and need to be welded separately, such as specially designed tee and saddle-shaped pipe fittings. , with or without intermission. It is suggested that there should be no intermittence to prevent the welding surface from being contaminated. Electrofusion connection method of pe water supply pipe: the process of insert link (also called socket connection). Before melting, cut the connecting end vertically to ensure sufficient hot-melt area. Commonly used cutting tools are rotary cutting tools, saw bows and plastic pipe scissors. Secondly, clean up the dirt at the joint of pe pipe and pipe fittings, and mark the insertion depth line: wipe off the oxide layer on the surface of pe pipe with fine sandpaper and scraper, and wipe the pipe and pipe fittings with clean cotton cloth. Insert the melted pipe fitting into the entrance of pe pipe fitting to a certain depth, and connect the welding machine with the pipe fitting.