In the pipeline construction process, due to construction site restrictions, PE pipe welding may be required. For example, the pipe jacking may be welded for tens of meters or hundreds of meters. If the welding is not good, it will affect the construction quality, cause water leakage, and affect the construction. Progress, here Runshuo Pipe Industry has compiled a copy of PE pipe welding methods and steps:

PE pipe counterpart
1. Fix the PE pipes and fittings to be welded on the butt jointing machine, and use clamps according to the pipe size. Use a brush and cotton cloth to remove the oxide layer, oil and dust on the nozzle.
2. The connecting ends of the two parts to be connected should extend a certain free length of the welding machine fixture, and the two corresponding parts to be connected should be straightened so that they are on the same axis. The wrong side should not be greater than 10% of the wall thickness.
3. The end face is planed with a milling cutter to make the butt end face smooth, flat, clean and vertical. Note: The milling cutter should be started first, and then the feed handwheel should be slowly turned. When continuous cutting occurs, the milling cutter head should be removed, and the two mating parts should be straightened by adjusting the tightness of the clamp (turn the pipe if necessary).
Endothermic phase
The heating plate automatically heats up until the green indicator light is on or reaches the set temperature. The pipes and pipe fittings to be welded are closed to heat the end faces. The feed handwheel stops feeding when the end faces are pressed to the corresponding flanging and keeps the heat absorption state. Separate the PE pipes and fittings from the heating plate, and then close the two heating end faces to butt, (see the heat absorption timetable) the two nozzles after heating are melted, and the heat absorption process is completed when heated to a molten state. When the ambient temperature is 20°C, the heating time is specified at 10×thickness (mm) seconds, and the flat bump height of the welding surface is required to reach the required value. Note: At this stage, only the flange that meets the specified requirements is required, and it is enough to maintain the pressure to absorb heat. Don’t continue to increase the pressure!
Remove the electric flat template
When the heat absorption process is completed, the electric heating plate is removed and the pressure is started quickly (see the docking pressure gauge), and the operation is proficient to complete within 10 seconds: especially when the ambient temperature is low, it should be shortened as much as possible, and the end face is cooled very quickly and the docking speed is slow. Directly affect the quality of welding.