Molding Process
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PA6 Weld Line Strengthening
Problem Phenomenon
Strength at the weld line of PA6 products is insufficient, breaking along the weld line under assembly force
Cause Analysis
The two melt fronts cool down and entrap air, with insufficient molecular entanglement at the meeting point; PA6 crystallization is unfavorably oriented at the weld line, with strength only 60-80% of the bulk
Solution
Raise melt and mold temperatures to improve the meeting quality; set vents and overflow wells at the weld line; adjust the gate so the weld line avoids load-bearing areas; change the feeding scheme if necessary
Key Takeaway
Weld lines cannot be eliminated, only strengthened and avoided, and venting plus overflow are the key measures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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