Get your tools ready. First, make sure you have the right tools for cutting square tubes. These may include angle grinders, cutting saws, or special square tube cutters. Choose tools that are right for the material and thickness of the tube. Measure and mark. Measure the length and angle of the tube before cutting. Mark a 22.5-degree angle on the square tube with a measuring tool. Make sure the markings are clear for reference during cutting. Fixed square tube: Secure the square tube during cutting to prevent movement. Use clamps on fixtures or workbenches to secure square tubes. Cutting: Cut according to your tool. When using an angle grinder or cutting saw, cut along the marked angle line at the right speed and force to avoid overheating or inaccurate cutting. Safety measures: Wear safety goggles, gloves, and earplugs during cutting to protect yourself from splashes and noise. Check the cutting quality. If necessary, you can use a file or sandpaper to trim the cutting surface.

By following the above steps and techniques, you can safely and accurately cut 22.5 degree square tubes.