1. Pressure control is fundamental. Welding pressure must be precisely set according to pipe specifications. Insufficient pressure will lead to incomplete welds, while excessive pressure may cause the flange to be too wide, affecting strength. The hydraulic system should be checked before each welding operation to ensure there are no leaks and the pressure gauge reading is accurate; this is a prerequisite for stable pressure.
2. Time control is crucial. Heating time, heat absorption time, and cooling time must all be strictly adjusted according to pipe specifications and ambient temperature. Too short a time will result in incomplete welds, while too long a time will lead to carbonization. Operators must be certified and familiar with the equipment's operating procedures; this ensures accurate time control.
3. Temperature control is essential. The heating plate temperature must be set according to the pipe grade: 215-235℃ for PE100 and 200-220℃ for PE80. Too high a temperature will cause carbonization, while too low a temperature will result in incomplete welds. The heating plate should be calibrated regularly with a thermometer to ensure uniform temperature, with an error not exceeding ±5℃.
4. Equipment stability is fundamental. Regularly inspect components such as fixtures, milling cutters, and heating plates to ensure they function properly. Keeping the equipment clean and promptly replacing worn milling cutters and hydraulic oil can effectively extend equipment life and maintain welding accuracy. When the ambient temperature is below 5℃ or the wind speed is greater than 2m/s, preheating or windproof measures must be taken to avoid affecting welding quality.
5. Post-weld inspection of the rolled edges for uniformity and smoothness, free of bubbles and shrinkage cavities, is the most direct method for judging welding quality. Only by combining parameter control, equipment maintenance, and post-weld inspection can high-quality welded joints be consistently produced.
