Weld line defects in injection molding is a line or lines on the part surface that caused the part looking ugly or caused part lifetime, or even broken easily.
These weld lines troubleshooting occur usually around holes or at the material flow joint area in the injection molded part, some welding lines is very small, specially if the molded part made in fiber-glass material, must be very carefully in the massive production.
Several years ago a customer transferred an old single cavity mold to our facility. The part was a very simple rectangular ring. It had two sub-gates, one at each end of the part on the short side of the rectangle. The material was glass-filled and made a […]