What are the characteristics, causes and preventive measures of the longitudinal welding wire of alu
When the longitudinal welding wire is extruded by the split-combination film, a strip-like or linear defect or a defect of no complete soldering occurs on the decorative surface of the ex..........
When the longitudinal welding wire is extruded by the split-combination film, a strip-like or linear defect or a defect of no complete soldering occurs on the decorative surface of the extruded material in the joining direction of the metal sulfur in the extrusion direction. The depth of the defect is the entire thickness from the surface to the back. It can be found by corrosion or anodizing. It is similar to the streaks of the tissue when it is observed by the naked eye. The outflow shows a strip pattern or a crack, which can be distinguished by referring to the structure of the mold.
Cause: Due to the differential locking of the metal flow in the welded part and other parts of the forehead; when the extrusion, the amount of aluminum in the welding cavity is insufficient to lock;
1 Improve the bridge structure of the split-flow combined mold, such as adjusting the split ratio (the ratio of the area of the split hole to the area of the extruded product) and the depth of the welded cavity;
2 Guarantee a certain extrusion ratio, pay attention to the balance between extrusion temperature and extrusion speed, and ensure deformation under high temperature and high pressure;
3 Do not use ingots with oily surfaces to ensure that the metal and tooling surfaces are clean and that lubricants and foreign objects are not allowed to pass into the weld.