Difficulties in Aluminum Alloy Processing and Their Solutions - Casting Defects (Cracks)

• Characteristics: There are linear or wavy patterns on the surface of the casting, narrow and long, showing a tendency under external force; the metal at the location of cold cracks has not been oxidized; the metal at the location of hot cracks has been oxidized. 

• Causes: Excessive iron content or silicon content in the alloy; Excessive harmful impurities in the alloy reduce its plasticity; Excessive zinc content or insufficient copper content in the aluminum-silicon-copper alloy; Mold, especially the mold