Molds & Tooling
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PA12 Weld Line Position and Strength
Problem Phenomenon
【Problem phenomenon】PA12 multi-gate products had obvious weld lines and cracked along the lines under stress
Cause Analysis
Rapid cooling of the melt after filling and improper gate position jointly cause weak weld lines; when a weld line appears at a stressed location, it becomes the starting point of fracture; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Increase injection pressure and speed, barrel and mold temperature to improve welding; change the gate position so that the weld line is located at an unstressed or inconspicuous place; open a cold slug well to discharge the cold front material
Key Takeaway
Weld lines rely on raising temperature to promote welding plus relocating to avoid them, with the cold slug well assisting in discharging cold material; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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