For PE hot-melt pipe fittings, there are two ways of hot-melt butt joint and hot melt socket. For the hot-melt pipe fittings with diameter less than 63mm, the pipe fittings need to be connected by hot-melt socket, while for the hot-melt pipe with diameter greater than 63mm, the pipe can be directly butt welded, and the caliber requirements for the above-mentioned hot-melt connection are in addition to flange connection.

These matters should be paid attention to when welding large caliber PE hot melt pipe fittings: it is necessary to ensure the end face alignment between the pipe and the pipe, milling cutter to cut the oxide layer, and the temperature and time of the heating plate should be controlled within the range of process requirements. In addition, it is also necessary to ensure that the heating time and cooling time of the pipe are just suitable. Because the heating time and cooling time are very important when the pipe is hot-melt welding, and the time control is not good, it will affect the hot melt effect of the whole pipe.

It is also important to note that when PE hot-melt pipe fittings are hot-melt welded, if the welding area has been fully cooled, it is forbidden to impact external forces, and no forced cooling method is allowed. When cooling, it is necessary to keep the natural condition and ensure the cooling of zhiailing is the most important.