Many people who have just come into contact with PE construction often ask questions about the operation of electrofusion welders. Although there are detailed instructions in the manual, many users still cannot grasp it. The connection interface of the electric fusion welding machine for thermal fusion butt is flat. The method is to heat the two identical connection interfaces with a hot plate to a viscous fluid state, remove the hot plate, and then apply a certain pressure to the connection interface. Cool and solidify in the state to form a firm connection.
Before heating, it is necessary to mill the two ports of the pipe to be welded, so that one is to make the welding surface more flat, and the other is to remove the plastic oxide layer on the surface of the port to make the same molecule melt more thoroughly. The main processes of the entire welding process are adjustment, heating, switching, seam pressure and cooling.
The materials in the viscous flow state at the interface flow and diffuse during the butt joint. Too much flow is not conducive to diffusion and entanglement. Therefore, the flow must be limited to a certain range to achieve "welding after melting" in the limited flow. Therefore, the key to the docking process is to adjust the three parameters of temperature, time, and pressure during the docking process, and to consider the properties, stress conditions, geometric shapes and environmental conditions of the connection interface materials to achieve reliable welding.
Tests should be carried out according to general rules and the characteristics of the respective materials used to evaluate the welding quality. After reaching the system standards, the process specifications of various specifications should be determined, and the production and on-site installation of welded pipe fittings should be carried out according to the specified process parameters, methods and procedures.
Regardless of whether it is manual or hydraulic type, heating plate and milling cutter are necessary. The difference is that the former relies on manual control, while the latter is powered by a hydraulic system to achieve semi-automatic control, especially for larger diameter pipes. , Milling, heating and cooling require a lot of pressure, which is generally difficult to achieve by manpower.
