Material Drying
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PA66 product low welding strength
Fenómeno del problema
Ultrasonic/hot plate welding cold welds, insufficient strength.
Análisis de la causa
Inconsistent moisture, improper parameters; PA water absorption affects welding repeatability; non-uniform moisture state is a hidden danger; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solución
①Unify product moisture state (dry or condition before welding); ②optimize process parameters and do DOE verification; ③clean welding surfaces to remove release agent and oil contamination; ④verify strength after welding/assembly; ⑤standardize pre-welding treatment (drying/conditioning).
Conclusión clave
PA66 welding='state unification': moisture is the chief culprit of cold welds; nylon welding must standardize the moisture state for parameters to be meaningful; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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