What are the reasons for leakage after hot melt joint and extrusion of HDPE pipes?

Possible causes for leakage after hot melt connection and pressure testing of PE pipes include:

Improper熔融temperature: Excessive or insufficient temperature during melting can affect the fusion quality of pipes and fittings, leading to loose connections and potential leaks.

2. Poor interface cleanliness: The interface has dust, oil, moisture, and other impurities, which hinder the good fusion of pipes and fittings, causing gaps and leading to leaks.

3. Insufficient bonding time: The hot melt bonding time is too short, resulting in insufficient fusion between the pipe and fittings, inadequate bonding strength, and a higher risk of leaks.

4. Insufficient Pressure Alignment: In the alignment process, inadequate pressure was applied, resulting in insufficiently tight fusion between the pipes and fittings.

5. Quality Issues with Pipes or Fittings: Pipes and fittings may have inherent quality defects, such as uneven materials or cracks, which can lead to leakage even after hot melt welding.

6. Operation Inefficiency: During the hot melt bonding process, construction personnel failed to adhere to the correct production process and standards, resulting in poor bonding quality.

7. Insufficient Cooling Time: After the hot melt joint is completed, the cooling time is not sufficient before undergoing pressure testing. At this point, the joint between the pipe and fitting has not fully solidified, which is prone to leakage.