Molding Process
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PA6 Weld Line Strength
Problem Phenomenon
Strength at the weld line is obviously insufficient, and snap-fits and tensile parts break along the weld line
Cause Analysis
When PA6 melt fronts meet, the surface solidified film hinders molecular chain entanglement, making the weld line a weak strength zone; glass fibers orient perpendicularly at the weld line, further weakening the bonding strength
Solution
①Raise melt and mold temperatures to improve the meeting quality; ②Arrange gates so the weld line avoids load-bearing areas; ③Set overflow wells at the weld line to discharge the cold material front; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The PA6 weld line is a required question of structural design; position transfer takes priority over process remedy, and load-bearing areas must stay away from weld lines; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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