Material Drying
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PA66 product drop fracture
Problem Phenomenon
Drops fracture along weld lines, test failed.
Cause Analysis
Weak weld lines + dry-state brittleness; sharp corner concentration also does; the fracture path points to the root cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Adjust the gate so weld lines avoid the stress path; ②condition before assembly to restore toughness and stabilize dimensions; ③change sharp corners to rounded transitions to eliminate stress concentration; ④strengthen drying and verify moisture content compliance by moisture determination; ⑤structurally reinforce weak parts (fillets, reinforcing ribs).
Key Takeaway
PA66 drop='path analysis': check where it breaks; weld lines, sharp corners and dry-state brittleness are the three high-incidence areas; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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