Material Analysis
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Heat-resistant polyethylene PPR pipe welded joint leakage
Problem Phenomenon
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.
Cause Analysis
(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
Solution
(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
Key Takeaway
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.
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