Электросварка VS термосварка полиэтиленовых труб: всестороннее сравнение

ПЭ трубы are indispensable in municipal engineering applications, but different connection methods lead to significant differences in their functionality. If you’re still unsure which connection method to use for your PE pipes, read this article to understand the differences between electrofusion and hot-melt fusion, which may offer some insights.

Now let’s delve deeper.

Electrofusion welding is a process that uses the heat generated by electricity to melt the connecting pipe fittings. It involves installing the connecting material between electrodes, and then passing an electric current through a resistance wire in the pipe fitting to generate resistance heat. This resistance heat raises the internal temperature of the material until it reaches its melting point, at which point the pipe fitting and the pipe material fuse together, completing the electrofusion connection of the pipeline.

Thermal Fusion Welding are divided into two types: socket welding and butt welding. Both methods utilize a heater to heat heating elements installed at both ends of the heater (generally, the heating elements have the same diameter as the pipe or fitting to be hot-melted). Once the heating elements are heated, the pipe or fitting is placed close to them to melt it. After melting for a period of time, the pipe or fitting is removed.

Hot-melt socket joints are commonly used for small-diameter pipes (DN63), with a maximum diameter typically of DN110. Because butt joints require external force, the diameter of pipes that can be connected is limited. Furthermore, during pressure testing, molten material can easily seep from the pipe joint, affecting the appearance of the finished pipe. Molten material may also adhere to the inner wall of the pipe, reducing the inner diameter and affecting water flow.

Butt fusion welding is mainly used for larger diameter PE pipes. Conventional pipe diameters are DN75 and above. Butt fusion pipes are generally made of thick-walled materials, and fittings are typically not required. During the welding process, a welding machine is used to melt the pipe, which is fixed to a frame. After melting, pressure is applied using the frame, and the butt fusion is completed under natural cooling.

Electrofusion connections are primarily used on pipes with a diameter of DN50 and above. Electrofusion fittings require specialized equipment for connection. The installation site needs a basic power supply. Because electrofusion fittings have embedded resistance heating wires, the installation cost is relatively high. However, due to its advantages such as minimal space constraints during installation, high connection strength, and good sealing, it is widely used in pipe installations in space-constrained areas and in emergency repairs of buried pipes.

Electrofusion and thermofusion are both relatively mature pipe connection methods, each with its own advantages and disadvantages in terms of connection method, cost, and manpower investment. The specific connection solution needs to be evaluated and adopted based on the actual use to reduce project costs while ensuring project quality.