Why the melting point of PPR pipes and fittings will easily occur leakage?

Why the melting point of PPR pipes and fittings will easily occur leakage?

In the process of using PPR pipe fittings, the melting point may occur leakage. What’s the reason?

First of all, it may be because of the high or low temperature of welding device. Second, in the welding process, there are the traces of water and oil in the melting point, which leads melting surface can not be melt. Third, if the mold is wore down seriously, aging and welding surface is not smooth, this phenomenon may also occur. In addition, in the process of construction, the pipes may be caused by man-made factors such as hit by heavy things or nail. Finally, if the pipe and pipe fittings are not the same brand and the raw materials are different, it can not be welded.