Material Drying
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PA6 Radiator Tank
Problem Phenomenon
The radiator plastic tank cracks and leaks after long-term use in coolant
Cause Analysis
The tank contacts high-temperature antifreeze for a long time, PA6 hydrolysis and glass fiber interface erosion cause strength decay, and stress concentration at the welded rib cracks first; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Select hydrolysis-resistant glass-fiber reinforced PA6 dedicated grades; optimize the welded rib structure to avoid stress concentration; verify by long-term immersion test in 135°C coolant; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Coolant contact parts must use hydrolysis-resistant grades plus long-term medium verification; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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