Hot-melt butt joints are either manual or hydraulic. Heating plates and milling cutters are mandatory. 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 takes a lot of pressure to mill, heat and cool, and it is generally difficult to do it. The whole docking process can be roughly divided into several steps: placing, milling, hot and cold, as follows:
The first step: preparation
Prepare the welding pe tube hot-melt butt welder, including the hydraulic power station, milling cutter, heating plate and other related power supplies, and place the docking rack smoothly;
Step 2: Place
The two sections of the PE pipe to be welded are placed in the docking frame, and the connection is disposed in the middle of the four fixtures of the docking station.
The third step: fixed
Close the upper and lower brackets of the docking station and secure the pe tube with bolts.
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 joint planes are milled, and the continuous long strip debris is milled out.
Step 5: Centering
Because the milling process may cause a deviation of the fixed pipe, it is necessary to center and adjust the wrong amount. Of course, be careful not to pollute the port, otherwise the milling must be performed again.
Step 6: Heating
Put the milling cutter back to the basket, take the heating plate out of the basket and put it into the middle of the two pe tubes, and heat it. After the two tubes start to turn over and meet the requirements, return the heating plate.
Step 7: Welding
Immediately after removing the hot plate, close the PE port to be welded at the required pressure.
Step 8: Cooling
After the docking is completed, there is a time for pressure-maintaining cooling. When the cooling time is reached, the temperature of the welding port and the ambient temperature are the same, then the pressure can be relieved to 0 and the welded pipe is removed. The welding is finished.
It can be seen that the main processes of the entire welding process are adjustment, heating, switching, joint pressurization and cooling. The material in the viscous flow state at the interface has a flow and a diffusion, and the flow is too large to be conducive to diffusion and entanglement, so the flow is limited to a certain range, and "post-fusion welding" is realized in a limited flow. Therefore, the key to the docking process is to adjust the three parameters of temperature, time and pressure in the docking process. The properties of the interface material, stress state, geometry and environmental conditions should be considered together to achieve reliable fusion welding. According to the general rules and the characteristics of the materials used, the welding quality is evaluated. After the system standard is reached, the technical specifications of each type of specification are determined, and the production and on-site installation of the welded pipe fittings are carried out according to the specified process parameters and steps.