What is the reason for the leakage of the hot melt joint of the PE pipe?

In the use of PE pipes, hot melt joint leakage is a common and difficult problem. Whether it is municipal water supply pipelines or drainage and sewage pipelines, once the PE pipe joint leakage occurs, it will not only cause water waste, but also may cause a series of problems such as damage to the surrounding environment. So, what is the cause of the hot melt joint leakage of PE pipes? How to remedy it?

The source of water leakage at the hot melt joint of PE pipes is the unqualified quality of hot melt welding. Hot melt welding is a key process of PE pipe connection, and there are many factors affecting the quality of this process, mainly involving the temperature of the heating plate, the cleanliness of the pipe end face, the pressure control during welding and the cooling and hardening process. Any deviation in one process may bury the hidden danger of water leakage.

heating plate temperature plays a decisive role in the effect of hot melt welding. If the temperature is too low, the contact surface of the pipe and the pipe fittings cannot be fully melted, resulting in weak welding; if the temperature is too high, the material will decompose and carbonize, which will also reduce the welding strength. Only by precisely controlling the temperature of the heating plate within the appropriate range (usually 21010 ° C) can the contact surface of the pipe and the pipe be uniformly melted to form a high-quality welded joint.

The cleanliness of the end face of the pipe is also a factor that cannot be ignored. If the end face remains soil, oil, water stains and other impurities, during hot melt welding, these impurities will hinder the fusion of the material, resulting in gaps or delamination on the welding surface, thereby reducing the sealing performance and causing water leakage. Therefore, it is necessary to use a clean rag or special tools to thoroughly clean the end face of the pipe before welding to ensure that no impurities remain.

pressure control during the welding process is also critical. During welding, if the pressure is too small, the pipe and the pipe fittings cannot be fully fitted, resulting in indense welding; if the pressure is too large, the molten material may be over-extruded, resulting in thinning of the welding surface and decrease in strength. The correct approach is to reasonably control the welding pressure according to the pipe specifications and welding process requirements, and keep the pressure stable, so that the material is fully integrated and not excessive loss.

Among many influencing factors, the cooling and hardening process is most easily ignored. After the PE pipe is welded, it takes a certain amount of time to cool and harden, so that the welded part can reach a stable strength. If the cooling down is insufficient to handle or apply pressure, the seam will have a weak point, and in the subsequent use process, it is very easy to leak when it is under working pressure. Generally speaking, the cooling down depends on the wall thickness of the pipe. The thicker the wall thickness, the longer the cooling down is required. It must strictly follow the relevant specifications and wait patiently for the pipe to be completely cooled and hardened.

When it is found that there is a leak at the PE pipe interface, the weld or the PE pipe joint of the water pipe, how to deal with it? If there is a slight water leakage, you can turn off the water source first, clean up the leaking part, and use a special PE pipe repair glue or quick repair joint for temporary plugging; if the water leakage is more serious, the leaking welding part should be removed and the standardized hot melt welding should be re-performed. In order to ensure the welding quality, it is recommended to operate by professionals and strictly follow the welding process standards.

As a professional PE pipe manufacturer, Hubei Aoyuan Building Materials Co., Ltd. has been cultivating in Wuhan and Hubei for many years, providing high-quality and reliable PE pipe products for many projects. Hubei PE pipe and Wuhan PE pipe produced by the company are made of high-quality raw materials. Through advanced production technology and strict quality inspection, each pipe has good performance and welding quality. If you encounter any problems during the use of PE pipe, please call Hubei Aoyuan Building Materials Co., Ltd. for consultation, and the professional team will provide you with detailed solutions and technical support.