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Old 08-28-2016, 02:29 AM
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clive clive is offline
 
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Default Bore welder

I'm curious on how a rotary bore welder used to weld up for line boring avoids twisting the wire and maintaining the arc. Has anyone here made one?
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Last edited by clive; 08-28-2016 at 02:30 AM. Reason: Missed word.
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Old 08-28-2016, 08:01 AM
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I have thought about making one, but hasn't happened as of yet. I understand that the wire does 'spin' inside the tip, and wears tips out faster than a regular tip would.

Hmmmm. Never noticed, but there must be some kind of 'rotating joint' between the tip and the hose of the welder. Gonna need to take a look at some videos etc again.

I've been slowly gathering parts to build one someday, biggest hurdle was getting an economical priced mag drill for a power unit.

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Old 08-28-2016, 07:05 PM
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I was wondering if something like carbon brushes are in there.
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Old 08-28-2016, 07:47 PM
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The liner in the shaft tube and the liner in the cable are separate. There is some type of rotating electrical connector between the two. One thing that was stressed was the cast in the wire (the amount of curvature in the wire as it's pulled off the spool) is kept to a minimum. Some suppliers had more cast than others.

It's been 15-17 years since I ran one, so I don't remember the specs or brands of wire that would work. I do remember that .023 or .030 wires were easier to work with than .035 wire.
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