How do I prevent aluminum sheets from warping or curling?

To prevent aluminum sheets from warping or curling, ensure proper storage by keeping them flat and avoiding stacking them under heavy loads. Maintain a controlled environment with consistent temperature and humidity to prevent expansion and contraction. When cutting, use sharp tools to minimize heat generation and stress. Apply a stress-relieving process after fabrication to reduce internal stresses. Use appropriate jigs and fixtures during fabrication to maintain flatness. Finally, consider the thickness and alloy of the aluminum sheet, as some are more prone to warping than others.