The specific workflow of HDPE water supply pipe hot melt docking process

is as follows: 1. Check the pipe according to the design requirements and inspect the appearance

2. Connect the lines of each component of the welding machine, clean the heating plate and set the heating temperature. When the temperature of the heating plate reaches 220 ° C plus or minus 10 ° C, keep it warm for another 10 minutes. Fix the pipe fittings to be welded, and use a milling cutter to mill the end faces of the pipe fittings.

3, when removing the milling cutter from the frame, the milling cutter should be avoided from colliding with the end surface, remove the milling cutter, check the hot melt surface clearance, the clearance shall not be greater than 0.3 mm, the milled end face should not be touched by hand or polluted by oil

4, the pipe and the heating plate collide, the pipe is flanged around, the pressure will be zero, start to absorb heat, the heat absorption time is 10 to 12 times the wall thickness, take out the heating plate, directly pipe and pipe butt to maintain pressure for 15 minutes, until the pipe cools down.

5, check the coaxiality of the pipe, the maximum amount of misalignment is 10% of the pipe wall thickness, when this requirement is not met, the weldment should be treated for re-clamping, milling, qualified before the next operation, hot melt welding process reference chart. Quality inspection of the joint, the joint is turned over and distributed smoothly and symmetrically along the entire circumference of the pipe. The lowest point of the flange should not be lower than the surface of the pipe. The amount of staggered edges is not greater than 10% of the wall thickness of the pipe and does not exceed 3 mm.

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