I. Pre-Operation Preparation
1. Equipment Inspection
Confirm that the machine frame, hydraulic station, milling cutter, heating plate, and other accessories are complete, and that the hydraulic oil level in the tank is at least 2/3 full.
Check the voltage, cleanliness of the heating plate, and function of the milling cutter to ensure there are no abnormalities.
2. Pipe Preparation
Clean the outer surface and ends of the PE pipe to remove any oxide layers and impurities.
Adjust the clamping jaws according to the pipe diameter, leaving enough space for the milling cutter, and tighten the screws.
II. Welding Procedures
1. Pressure and Milling Test
Turn the pressure regulating valve counterclockwise to the minimum setting. Start the hydraulic system and slowly increase pressure until the cylinder advances at a constant speed. Record the drag pressure value P.
Insert the milling cutter and secure it. Cut the pipe end flat. After removing any debris, check the misalignment (must be ≤10% of the pipe wall thickness). 2. Heating and Butt Welding
Set the heating plate temperature to 220 ± 10°C. The heating time is calculated as the pipe wall thickness x 10-13 seconds.
After the pipe ends are pressed against the heating plate to form a uniform bead, the pressure is released and heat is absorbed. After the timer expires, the pipes are immediately joined and cooled.
III. Precautions
Safety Regulations: The equipment must be reliably grounded. Avoid contact with hot components during operation.
Pressure Control: Welding pressure should be calculated based on the standard pressure Pa (actual pressure P = Pa + Pdrag).
Cooling Time: The weld must be completely cooled before pressure relief and disassembly to avoid compromising strength.
IV. Troubleshooting
Misalignment Adjustment: Adjust using the compression screw to ensure the misalignment ratio meets the specified value.
Irregular Heating: Check the temperature controller and heating plate connections, and replace the heating element if necessary.
