Material Drying
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PA6 product welding problems
Problem Phenomenon
Ultrasonic/hot plate welding has low strength and cold welds.
Cause Analysis
Moisture-containing interface vaporizes causing cold welds, improper welding parameters; PA water absorption affects welding repeatability; inconsistent 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.
Solution
①Unify drying or conditioning before welding; ②optimize welding parameters; ③clean the welding surface; ④verify strength after welding; ⑤unify the moisture state of products (dry or condition before welding).
Key Takeaway
PA6 welding='unified moisture state': 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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