Material Analysis
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Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe welded joint leakage
Problem Phenomenon
After hot-melt welding of PPR/PP-R pipes, the joints leak in pressure tests, and the weld strength is insufficient.
Welded joint leakage is a common failure point in piping systems and affects water supply system safety.
Cause Analysis
（1）Welding temperature improper, not reaching the material melting temperature or too high causing degradation\
（2）Welding time insufficient, the surface molten layer depth not enough\
（3）The pipe and fitting are not concentric during welding\
（4）The welding surface is contaminated with oil, water or dust\
（5）Pipe wall thickness uneven or fitting diameter not matching
Solution
（1）Control the hot-melt welding temperature at 260-280°C (PPR/PP-R), strictly calibrate the heating plate temperature\
（2）Strictly follow the standard for welding time: DN20 pipe 5s, DN25 pipe 7s, etc.\
（3）Use dedicated clamping tools to ensure the pipe and fitting are concentric and aligned\
（4）Clean the welding surfaces of the pipe and fitting before welding, remove oil and dust\
（5）Use pipes and fittings of the same brand and series, ensure dimensional matching
Key Takeaway
PPR welded joint leakage is caused by improper welding parameters or welding surface contamination, requiring strict control of welding temperature, time and cleanliness.
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