Fillet
Command - Prb_Fillet
     
This command will work on almost all edges of plates and profiles.
But it will also work on the axis of a profile if you use it on a profile with at least 2 axis line segments.
At the command line prompt:
- Enter the fillet radius
 - Select the first line
 - Select the second line
 

The result after applying a fillet on a plate

Before and after applying a fillet on the axis of a profile