Processing Machinery
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Polyolefin plastomer PPR pipe welded joint leakage (Variant: strengthened measures)
Fenómeno del problema
After hot-melt welding of PPR/PP-R pipes, the joint leaks in the pressure test and the weld strength is insufficient.
Welded joint leakage is a common failure point of pipeline systems and affects the safety of water supply systems.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(1) Welding temperature improper, not reaching material melting temperature or too high causing degradation
(2) Welding time insufficient, surface molten layer depth not enough
(3) Pipe and fitting not concentric during welding
(4) Welding surface contaminated with oil, water or dust
(5) Pipe wall thickness uneven or fitting diameter not matched
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Control hot-melt welding temperature at 260-280°C (PPR/PP-R), strictly calibrate the heating plate temperature
(2) Strictly implement welding time standards: DN20 pipe 5s, DN25 pipe 7s, etc.
(3) Use special clamping tools to ensure concentric alignment of pipes and fittings
(4) Clean the welding surfaces of pipes and fittings before welding to remove oil and dust
(5) Use pipes and fittings of the same brand and series to ensure dimensional matching
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
PPR welded joint leakage is caused by improper welding parameters or contamination of the welding surface, and welding temperature, time and cleanliness need to be strictly controlled.
Targeted preventive measures need to be taken in different production scenarios.
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