Production & Quality
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HDPE pipe internal stress cracking
Fenómeno del problema
The pipe develops longitudinal cracks after storage or use for a period of time, especially at cut notches.
Análisis de la causa
Too fast cooling causes large temperature differences between the inner and outer pipe walls and inconsistent shrinkage, producing internal stress; uneven sizing cooling also freezes orientation stress, and stress concentration at cut sharp corners induces cracking.
Solución
①Optimize the cooling gradient to avoid quenching; ②ensure uniform spraying; ③make rounded transitions at cut notches; ④anneal the pipe if necessary.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Pipe internal stress cracking has a lag; uniform slow cooling is the fundamental prevention, and notch treatment and annealing can be used as remedial measures.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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