The connection interface of the hot-melt butt joint is flat. The method is to heat the two identical connection interfaces to a viscous flow state with a hot plate, remove the hot plate, and then apply a constant pressure to the connection interface, and cool and solidify under this pressure state, forming a solid connection. Before heating, it is necessary to mill the two ports of the pipeline to be welded, so that the welding surface is smoother, and the plastic oxide layer on the surface of the port is removed to make the same molecule melt more thoroughly.
Whether it is a manual type or a hydraulic type, the heating plate and the milling cutter are necessary in the PE pipe welding machine. The difference is that the former relies on manual control, while the latter is powered by the hydraulic system to achieve semi-automatic control, especially for pipes with larger diameters. It requires a lot of pressure during milling, heating and cooling, and it is generally difficult to do it manually. The whole docking process can be roughly divided into several steps: placing, milling, heating, and cooling.
(1) The first step: preparation
Prepare the pe pipe welding machine, including the hydraulic station, milling cutter, heating plate and other related power sources, and place the docking frame stably.
(2) Step 2: Place
Place the two pieces of pe pipe to be welded in the docking frame, and the connection is handled in the middle of the four clamps of the docking frame.
(3) Step 3: Fix
Close the upper and lower brackets of the docking frame and fix the pe pipe with bolts.
(4) Step 4: Milling
Take the milling cutter out of the basket, place it in the middle of the two PE pipes, push the joystick of the hydraulic station, and contact the two PE pipes with the milling cutter until the two connecting planes are milled, and a continuous long strip of debris is milled out.
(5) Step 5: Alignment
Because the fixed pipe may be offset during the milling process, it is necessary to re-center and adjust the misalignment. Of course, pay attention not to contaminate the port, otherwise it must be cut again.
(6) Step 6: Heating
Put the milling cutter back into the basket, and take the heating plate out of the basket and put it in the middle of the two PE pipes for heating. After the two pipes start to flange and meet the requirements, put them back on the heating plate.
(7) Step 7: Welding
After taking out the hot plate, immediately press the pressure requirement to quickly close the PE port to be welded.
(8) Step 8: Cooling
After the docking is completed, there is a time for holding pressure and cooling. Finally, when the cooling time is up, and the temperature of the welding joint is consistent with the ambient temperature, the pressure can be relieved to 0 and the welded pipe can be removed. This welding is over.
It can be seen that the main processes of the entire pe pipe welding machine welding process are adjustment, heating, switching, joint pressurization and cooling. The material in the viscous flow state on the interface during butt joints flows and diffuses. Too much flow is not conducive to diffusion and entanglement. Therefore, the flow should be limited to a certain range to achieve "post-melt welding" in a limited flow.