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Tubing question

Old 06-11-14, 03:31 PM
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Retroms68
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Tubing question

Hi. Im hoping someone with experience could tell me if the patternisation on this tubing suggests that it is drawn tubing rather than seamed.
Thanks in advance for any help
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Old 06-11-14, 04:42 PM
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Andrew R Stewart 
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I suspect it's from the butting process. Do you know the brand or series? Andy.
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Old 06-11-14, 06:13 PM
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Lots of seamed tubing is drawn and butted after the seam weld, so cold drawing and seamed are not mutually exclusive. Columbus Cromor is an example of seamed tubing that is post-weld drawn and butted.

As Andy says, the ribs in the photo may be an artifact of the die and mandrel or the tube reeling during the butting process, but that doesn't mean it isn't seamed.

How are butted tubes made?
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Old 06-12-14, 04:38 AM
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Retroms68
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The image is of the down tube on a prototype Orange Clockwork from "88/89.
It has a mix of Infinity and Prestige tubes. As part of the project I am trying to uncover as much information as possible and my question was to ascertain which tubing was used where. After clean up I noticed the pattern on the top , seat and down tubes and wondered what process produced this pattern.
I didn't know that drawn tubing could also have been seam welded.

Thanks for replying guys.
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Old 06-15-14, 04:05 PM
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JohnDThompson 
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Prestige tubing was brushed after drawing and heat treatment to remove any scale. I suspect that is what you see.
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Old 06-15-14, 07:44 PM
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Mark Kelly 
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You could always just measure the wall thickness of each tube using an ultrasonic thickness gauge. I use an old Nova 800, works well.
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Old 06-16-14, 10:39 AM
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Originally Posted by Retroms68 View Post
Hi. Im hoping someone with experience could tell me if the patternisation on this tubing suggests that it is drawn tubing rather than seamed. Thanks in advance for any help
Retro -

I would say that the markings around the circumference of the tube say nothing about whether the tube is seamless or seamed. I would suggest that it more likely it reflects that the tooling is worn or a bit out of adjustment and the QC process in place still passed the tube as good enough to sell. Frankly I have not seen a tube that "looked this poorly" from any major tubing producer (Reynolds, Columbus, True Temper, Vitus, etc.) and I have used or handled most of them. Visit any local frame builder and ask to see any of the raw tubes they have lying around in stock...they will almost surely look far finer that this example.

/K
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