Processing Machinery
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PA66 weld line strength
Problem Phenomenon
PA66 structural parts break along weld lines, with strength only half of the base material
Cause Analysis
The two melt flow fronts have low temperature and entrap gas, and molecular entanglement at the convergence is poor; PA66's rapid solidification aggravates weld line weakening; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Raise melt temperature and mold temperature; open venting and overflow wells at weld lines; adjust gates to avoid stressed areas; change load-bearing parts to single-point gating; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Weld lines rely on process strengthening plus structural avoidance, load-bearing parts are solved from the gating scheme; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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