Pipe welding machine.
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Previously:
https://www.homemadetools.net/forum/...864#post186870
https://www.homemadetools.net/forum/...247#post184873
https://www.homemadetools.net/forum/...025#post176119
https://www.homemadetools.net/forum/...578#post166813
https://www.homemadetools.net/forum/...907#post152752
https://www.homemadetools.net/forum/...574#post151547
