What is weld lines defects?
When plastic flows around an obstruction (for example a hole) in a mold cavity the point where the material comes back together is called a weld line. If two more more plastics material flow together after coming together it will become a meld line. Weld lines will always have when two or more melt flows meet together. we call knit lines defects as well
Weld lines defects issues and troubleshooting skill
Weld lines defects are formed when two flow fronts are merged together. An obstruction such as a core pin or holes will split the material flow and cause a weld line issue to form on the other side. […]