Material Analysis
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Linear low-density polyethylene PPR pipe welding joint leakage
Fenómeno del problema
After hot-melt welding of PPR/PP-R pipes, the joint leaks in pressure testing, and weld strength is insufficient.
Welding joint leakage is a common failure point in pipeline systems, affecting the safety of water supply systems.
Análisis de la causa
(1) Improper welding temperature, not reaching the material melting temperature or too high causing degradation
(2) Insufficient welding time; the surface molten layer depth is not enough
(3) The pipe and fitting are not concentric during welding
(4) The welding surface is contaminated by oil, water or dust
(5) Pipe wall thickness is uneven or the fitting diameter does not match
Solución
(1) Control hot-melt welding temperature at 260-280°C (PPR/PP-R), and strictly calibrate the heating plate temperature
(2) Strictly implement welding time standards: 5s for DN20 pipe, 7s for DN25 pipe, etc.
(3) Use special clamping tools to ensure concentric alignment of pipe and fitting
(4) Clean the welding surfaces of pipe and fitting before welding to remove oil and dust
(5) Use pipes and fittings of the same brand and series to ensure dimensional matching
Conclusión clave
PPR welding joint leakage is caused by improper welding parameters or welding surface contamination; welding temperature, time and cleanliness need to be strictly controlled.
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