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#1
November 14th 2004, 16:14
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Some tube questions.
Assuming all the numbers are equal whats stronger. A tube with a big diameter and thin walls or a tube with a small diameter and thick walls? And would this be the same for square tubing as well?
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67ghia, 2.3T mid engine conversion, tube frame dbl a-arm, rx7 brakes, currently in parts collection/bodywork stages. 
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#2
November 14th 2004, 19:44
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Thick walls always stronger regardless of diameter... but you could go chro-mo and get a lot more strength with thin wall. That's why the racers do it, same diameter as mild steel but a lot thinner gauge, so less weight.
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No current VW projects 54 Chevy wagon LS2 AWD 56 Chevy Panel "Lost Cause" VKG Bastage child
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#3
November 15th 2004, 01:35
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chromo is not for amature welders, it has a very tightly grained structure, inproper welding will cause it to crack, brazing it will make it shatter as it cools.
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a few pics of my project
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#4
November 15th 2004, 08:17
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Correct! but if it was a small part, he could farm it out to a pro like I did. Just tryin' to throw out some options.
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No current VW projects 54 Chevy wagon LS2 AWD 56 Chevy Panel "Lost Cause" VKG Bastage child
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#5
November 15th 2004, 14:16
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Quote:
but do remember, chromo breaks where mild steel bends. if that works for you then do it.
__________________
a few pics of my project
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#6
November 16th 2004, 04:36
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Sorry, but the bigger the diameter, the strength increases, so weight for weight a big diameter tube would be stronger.
Also, a round tube is stronger than a square tube. I have the equations if you want... Rich
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http://www.ricola.co.uk
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#7
November 16th 2004, 11:56
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I believe you, I'm not sure I understand why though. Is it just because of the larger diameter having more surface area to dissipate/spread the load?
__________________
No current VW projects 54 Chevy wagon LS2 AWD 56 Chevy Panel "Lost Cause" VKG Bastage child
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#8
November 17th 2004, 00:34
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I figured the larger diameter tube was stronger. I dont plan to do much messing around with chromo until I can get a TIG welder. I like the weight benifits of a chromo cage but in the end I think a mild steel cage will be more protective cause I know havin a big metal tube stickin through you isnt very safe.
__________________
67ghia, 2.3T mid engine conversion, tube frame dbl a-arm, rx7 brakes, currently in parts collection/bodywork stages.
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#9
November 17th 2004, 04:27
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It basically comes down to the fact that it has more cross sectional area further away from the Neutral axis (this is the part of the tube that is neither stretched or compressed).
Rich
__________________
http://www.ricola.co.uk
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#10
December 2nd 2004, 23:12
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4130 chromemoly can be mig welded effectively, the biggest problem is cooling it too fast-that's where the brittleness comes from. If you require a very light weight car and can afford the chromemoly it's good stuff and welded correctly will not "shatter". Mild steel is considerabley cheaper, easier to get good welds on and with the correct dia. and wall thichness is more than strong enough for anything you might like to fab.
What do you plan to build? ken
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