Molds & Tooling
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Extremely low strength at weld lines
Problem Phenomenon
Obvious line marks appear at melt merging points of multi-gate products, and tensile tests all break there
Cause Analysis
The merging melt temperature is too low to achieve sufficient molecular diffusion and entanglement; vent groove design is insufficient, causing trapped air; dispersed phase particles enrich at the weld interface
Solution
Increase melt temperature by 10-20°C and mold temperature; optimize gate position to reduce the number of weld lines; add vent grooves (depth 0.02-0.05mm)
Key Takeaway
Weld lines are structural stress concentration points, and their strength depends on the degree of interfacial molecular diffusion
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