The third step is to remove the milling cutter, close the fixture, and check the gap at both ends of the pipe (the gap should not be greater than 0.3mm). When removing the milling cutter from the frame, avoid collision between the milling cutter and the end face. If it has happened, it needs to be re-milled; the milled end face should not be touched by hand or polluted by oil.

The fourth step is to remove the heating plate, quickly let the two hot-melt end faces stick together and pressurize. In order to ensure the quality of fusion butt joint, the shorter the switching cycle, the better.