Questions and answers about problems that often occur during hot-melt welding of PE pipes
When PE pipes are hot-melt welded, it often looks like they are well welded. There is no problem if you put it down gently or drag it slowly. However, there are countless cases where it will break if you use force or bend it. Today I will answer your questions, under what circumstances will false welding occur during welding?
1. The hot melt temperature is too high
Under normal circumstances, the production temperature of PE pipes is actually between 195-210 degrees. During the hot-melt welding process, the temperature can be slightly higher. The temperature needs to be controlled between 210-230 degrees for hot-melt welding. In many cases, due to the hot melt plate being used for too long, the debugging temperature cannot be accurate, and even reaches above 300°C, directly carbonizing the PE pipe, resulting in false welding during the welding of the PE pipe.
2. The interface is seriously wrong.
During the butt welding process of PE pipes, the wall thickness deviation of the butt joints is not allowed to be greater than 10% of the pipe wall thickness. Many welding masters with insufficient skills did not meet the standard for pipe stacking, resulting in flat pipes and deviations in the butt joints of the welds. The welding surface connection with low kilogram pressure cannot even reach 60%, resulting in false welding of the pipe.
3. The pipes were not cleaned during welding
There are also many irresponsible welders who often weld without cleaning the stains or other foreign objects on the surface of the pipe. Trachoma and unadhesive fissures often occur.
