1, PE-RT pipe heat fusion socket welding, heat fusion machine temperature control at 250-260 ° C.
2, PE-RT pipe, pipe fittings socket in the die head to stay a short time, the speed should be fast Pipe and fittings and then pulled out of the pipe fittings should be quickly socket that moment. Normal operation process is to adjust the machine to 255 ° C, at the same time ready to melt the pe-rt pipe fittings, to be hot melt machine temperature to reach the set temperature, the left hand to take the pipe right hand to take the pipe fittings equalization of the relative force for the socket Until the left and right hand at the same time feel the pipe fittings have reached the depth of socket when the pipe fittings quickly pulled out of the mold head, the instantaneous and rapid insertion of pipes into the pipe fittings to maintain a certain period of time until the temperature cools down, before you can let go of your hand. Only then can you let go. This is the PE-RT pipe hot melt socket welding method.
PE-RT pipe heat fusion docking to be divided into four steps:
1, fixed to docking part of the PE-RT pipe to be welded, parts of the fusion welding machine is fixed in the fixture, after fixing the pipe, the center line of the components should be on the same level, the pipe wall overlap, avoid high and low, left and right misalignment.
2. Milling PE-RT pipe end face Before milling, clean cotton cloth should be used to wipe the inside and outside of the pipe end within 100mm, and then fix the milling cutter to push the walking part to mill the pipe end. Here need to pay attention to two problems, one is to stop before the force should be withdrawn slowly to ensure that the pipe end smooth (sudden withdrawal of the milling cutter will leave a groove shell in the end of the pipe), and the second is to prevent the end of the pipe before the heating of the secondary pollution.
3, thermal fusion docking Heating plate before melting the butt surface, to check the alignment again, such as visible gaps, wrong mouth phenomenon to be corrected by adjusting the fastening nut and other methods. First of all, the hot melt butt welding machine heating plate preheating to 210 ~ 220 ℃, and then melt PE-RT pipe end face, melting time is generally wall thickness × 10 seconds. It should be noted that the temperature of the heating plate can only be used as a reference, and its indication will sometimes be due to the ambient temperature and its own quality and other reasons with the actual discrepancies. Heat fusion to meet the design requirements also depends on the main pipe end melting crimping situation Crimp thickness shall not be less than 1/10 of the wall thickness of the pipe, to achieve the fusion of the two ends completely together to be considered to meet the standards.
4, fusion face to face two hot melt surface (PE-RT pipe and PE-RT pipe or PE-RT pipe and PE-RT pipe fittings) are to meet the fusion requirements, quickly move away from the heating plate, force to make the two ends of one. Immediately after the force to lock the latch lock, so that the interface to maintain a constant butt pressure, until the interface temperature drops to ambient temperature before the pressure is lifted, remove the fixtures, this part of the attention to the cooling process can not move the pipe, but also can not have an external force on the pipe. 5. Fixed machine devices, the appearance of the fusion joining port to check the counterparts of the heat fusion ring to the height and width of the molding should be uniform, beautiful, its Height 2 ~ 4mm, width 4 ~ 8mm is qualified.
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