Molds & Tooling
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PC/ABS Weak Weld Lines
Problem Phenomenon
PC/ABS structural parts have insufficient strength at weld lines, and drop tests crack along the weld line.
Cause Analysis
Poor venting or insufficient melt temperature makes the fusion at the meeting point weak; the weld line position of structural parts is more critical than appearance, and PC/ABS's weld strength depends on temperature and venting.
Solution
①Increase melt temperature and injection speed; ②Improve venting at the weld line; ③Adjust the gate so the weld line avoids stress-bearing areas; ④Set an overflow well at the meeting point to lead the cold front out of the cavity; ⑤Reduce the number of gates.
Key Takeaway
For PC/ABS structural parts, 'weld line position takes priority over appearance': design it into a non-stress-bearing area, then raise temperature and vent to strengthen; the weld line of structural parts is a mechanical problem and must be planned in advance.
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