How do I check the quality of aluminum coils?

To check the quality of aluminum coils, you should inspect for surface defects such as scratches, dents, or discoloration. Measure the thickness and width to ensure they meet specifications. Test the hardness and tensile strength to verify mechanical properties. Conduct a chemical analysis to confirm the alloy composition. Check for internal defects using non-destructive testing methods like ultrasonic testing. Assess the coil's flatness and straightness to prevent issues in further processing. Finally, ensure proper packaging and storage conditions to maintain coil quality.