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Phwoaaaar, unweldable they said!
https://phys.org/news/2019-01-nanotechnology-enables-weld-previously-un-weldable.html
That could actually be really cool for bikes couldn't it?!
It will be interesting to see if anyone manages to commercialise it, it's obviously not worth it if you're just going to replace 7005 wih 7075, you would have to reduce the wall thickness near the butts. But you still have to leave enough behind for the tube itself to be strong enough, and it has to be practically weldable, i.e. you can't make a downtube so thin that the welding just blows holes in it long before the thicker headtube has bonded to it.
i was not aware of that
Don’t tubed become prone to crushing in the wall thickness is less than 1/50 of the diameter? Wouldn’t this then lead to smaller diameter tubes that would fatigue sooner? Unles 7075 is more resistant to fatigue
That's very high resolution welding
Geo on that frame looks way out 😂
Im sure 7075 has been used in bonded frames in the past, Raleigh Dyna-Tech springs to mind.