6061 vs. 7005 Aluminum tubing
For those in the know, is there any significant difference between 6061 and 7005 aluminum alloy tubing that might create a superior frame for say cyclocross ? Are there many inherent differences ? Thank you for your insights.
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OK, never mind, found a lot of info on other sites.
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7005 has much better (I believe twice) fatigue strength.
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Originally Posted by robow
(Post 7771287)
OK, never mind, found a lot of info on other sites.
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My books say that 7xxx AL is not suitable for arc or gas welding where as 6xxx series AL is.
Having said that, 7005 is not specifically mentioned. Since some bikes are made out of it, welding properties must not be too bad. Like ElJam says, it's quite a bit stronger, so you could theoretically build a lighter frame. By playing with tubing sizes, the frame could end up more or less stiff, the 2 do not necessarily go hand in hand. |
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Originally Posted by Fat Boy
(Post 7999559)
My books say that 7xxx AL is not suitable for arc or gas welding where as 6xxx series AL is.
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Originally Posted by robow
(Post 7771205)
For those in the know, is there any significant difference between 6061 and 7005 aluminum alloy tubing that might create a superior frame for say cyclocross ? Are there many inherent differences ? Thank you for your insights.
Now here's what's interesting... in one of my factory visits in China, I asked the very same question. Somewhere along the conversation of heat treatment (and various sushi and beer type comparisons between the west and east), I asked "does the heat treatment or temper (T6) in aluminium last forever?" The answer was a rather casual, no! Now I'm kicking myself here, because I wasn't really listening (maybe I got distracted by the prospect of eating the turtle soup :twitchy:)... but the temper apparently diminishes in time, like it self-anneals or something. Don't ask me how many years, but just in case you want to bequeath the frame to your grandson or something, it might pay to check this aspect in your research. One of them lasts a heck of lot longer than the other, I'm just not sure which one it is. Please bear in mind that this is what I've been told and I have not had the time or the need to verify the information. So if you find out, please kindly post back and let us know. Funny that, suddenly I feel like having some sushi... :rolleyes: . |
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