Magnetic angle fixer
A magnetic angle fixture or welding angle is used to fix two metal parts at right angles , for example to weld them together.
A rigid angle fixer can be used for various fixed angles, such as 45 degrees and 90 degrees. There are also adjustable types for any angle in a given range. There are shapes with smooth legs, e.g. for sheet metal, and there are notched special shapes for fixing round profiles and shaped tubes.