Welding mitered corners.
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Previously:
https://www.homemadetools.net/forum/...669#post190031
https://www.homemadetools.net/forum/...941#post187155
https://www.homemadetools.net/forum/...507#post177840
https://www.homemadetools.net/forum/...300#post177085
https://www.homemadetools.net/forum/...188#post176643