Pipe friction welding.
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Previously:
https://www.homemadetools.net/forum/...601#post182333
https://www.homemadetools.net/forum/...7862#post86386
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
