Material Analysis
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Welding Joint Leakage of Polypropylene PPR Pipe
Fenómeno do problema
After hot-melt welding of PPR/PP-R pipes, the joints leak in the pressure test, and the weld strength is insufficient.
Welding joint leakage is a common failure point of pipeline systems and affects the safety of water supply systems.
Análise das causas
(1) The welding temperature is improper, not reaching the melting temperature of the material or too high, causing degradation
(2) The welding time is insufficient, and the depth of the surface molten layer is not enough
(3) The pipe and the fitting are not concentric during welding
(4) The welding surface is contaminated by oil, water, or dust
(5) The pipe wall thickness is uneven or the fitting diameter does not match
Solução
(1) Control the hot-melt welding temperature at 260-280°C (PPR/PP-R), and strictly calibrate the heating plate temperature
(2) Strictly follow the standard for welding time: DN20 pipe 5s, DN25 pipe 7s, etc.
(3) Use special clamping tools to ensure the pipe and the fitting are concentrically aligned
(4) Clean the welding surfaces of the pipe and the fitting before welding to remove oil and dust
(5) Use pipes and fittings of the same brand and series to ensure dimensional matching
Conclusão principal
PPR welding joint leakage is caused by improper welding parameters or contamination of the welding surface; the welding temperature, time, and cleanliness need to be strictly controlled.
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