[Science Stickers] Introduction to the welding process of PPH pipes

PPH tube is β-modified for ordinary PP material, so that it has a uniform and fine β crystal structure, and has excellent chemical resistance, abrasion resistance, high temperature resistance, corrosion resistance, aging resistance and good insulation.量产品。 Volume products.

1. Cutting

Use a special cutter to cut the pipe to the required size. When cutting the pipe, be careful not to run the line, slowly screw in the blade, do not go too fast, otherwise the blade will be damaged. When the cutter is difficult to rotate, rotate the cutter in the opposite direction, take out the blade, and re-run the thread.

2. Warm up

Adjust the preheating pressure to the welding pressure with a hydraulic control valve. Adjustment method: lock the heating pressure relief valve, push the hydraulic operating lever forward, and watch the pressure gauge display pressure. When the required pressure is not reached, loosen the heating pressure relief valve, make the pressure gauge display down to zero, readjust the hydraulic regulating valve, and then lock the heating pressure relief valve until the pressure reaches the required pressure. Use the temperature setting panel on the welding machine control platform to set the temperature of hot melt welding and control the temperature of the heating plate to match the melting of the welding surface. Red shows the set temperature and green shows the current temperature. When the red light on the panel jumps to the green light, hot melt welding can be performed. The PPH melting temperature is generally set between 195°C and 205°C.

3. Counterpart

①Choose an appropriate mold and use a wrench to fix the welded pipe section on the operating platform. Note: When fixing, tighten the screws at both ends of the fixture one by one to avoid that the pipe section is not level; the distance between the two pipe sections when the hydraulic operating rod is retracted to the maximum should not be less than the thickness of the electric cutting machine; the welding surface of each pipe section should protrude from the fixture When the 40-50mm pipe section is long, pay attention to the overall level.

② Push the hydraulic operating lever to the maximum, and align the two pipe sections. Visually inspect the misalignment of the welding surface, and touch the lower half with your hands to make the two seams level. When the requirements are not met, adjust the fastening screws at both ends to ensure that the weld is level without misalignment;

③Visually inspect the joints of the two welding surfaces to ensure that there is no obvious gap in the joints; if any, use an electric cutting machine to grind the joints. Place the cutting machine on the operating frame, start the cutting machine, and then another person manipulates the hydraulic propulsion lever to push the pipe section against the cutting machine at a set pressure; visually observe the welding surface to be cut until the welding surface is level. Retreat the hydraulic clamp, take out the cutting machine, and put back the tool holder; Note: After retracting the hydraulic clamp, do not rush to stop the cutting machine, let the cutting machine rotate a few times before taking it out. It can make the welding surface smoother and prevent cross-section.

④ Clean the welding surface, and use a clean cloth dipped in a small amount of acetone to clean the welding surface.

4. Heating

Take out the heating plate that has reached the required temperature from the tool holder. Put it on the operating frame, leaning against the welding surface, and push the hydraulic clamp to make the pressure reach the required welding pressure. When the welding surface hot melt flanging reaches 1mm, loosen the heating pressure relief valve, remove the heating pressure, and wait for a period of time to meet the welding surface hot melt butt joint requirements. Note: The heating plate must be placed vertically.

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