Friction welding on a drill press. 4:10 video:
https://www.youtube.com/watch?v=ZIZhDoNOeJk
Previously:
https://www.homemadetools.net/forum/...085#post149502
https://www.homemadetools.net/forum/...787#post159855
https://www.homemadetools.net/forum/...221#post134789
https://www.homemadetools.net/forum/...2814#post97209
https://www.homemadetools.net/forum/...968#post100346
https://www.homemadetools.net/forum/...7862#post86386