Material Analysis
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Leakage of low density polyethylene PPR pipe welding joints
Problem Phenomenon
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 water supply system safety.
Cause Analysis
(1) Improper welding temperature; not reaching material melting temperature or too high causing degradation
(2) Insufficient welding time; insufficient depth of surface molten layer
(3) Pipe and fitting not concentric during welding
(4) Welding surfaces contaminated with oil, water, or dust
(5) Uneven pipe wall thickness or mismatched fitting diameter
Solution
(1) Control hot-melt welding temperature at 260-280°C (PPR/PP-R), strictly calibrate heating plate temperature
(2) Strictly follow standards for welding time: DN20 pipe 5s, DN25 pipe 7s, etc.
(3) Use dedicated clamping tools to ensure concentric alignment of pipe and fitting
(4) Clean welding surfaces of pipe and fitting before welding, remove oil and dust
(5) Use pipes and fittings of the same brand and series to ensure dimensional matching
Key Takeaway
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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