Comment on Aluminum

moshankey@lemmy.world ⁨3⁩ ⁨months⁩ ago

• myrrh@ttrpg.network ⁨3⁩ ⁨months⁩ ago

  …my steel frame split at the welds fourty-five years ago; my bonded aluminum frame has ridden out building fires with nary an issue…

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• Damage@feddit.it ⁨3⁩ ⁨months⁩ ago

  not to defend Alluminium (bleh), but that’s likely a production error, bad hydroforming, bad welds… at least it’s not CF!

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  • moshankey@lemmy.world ⁨3⁩ ⁨months⁩ ago

    It was the early 90’s and Raleigh had a line called Technium. The tubes were bonded to the lugs. Not really welded. More pinned and “glued” I guess. The frame broke at either the top or down tube and there went the fork, and my buddy’s face. Screw aluminum. Steel has memory. I found that out the hard way. I’m far from a metallurgist. This is the extent of my elementary teacher brain.

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• Eheran@lemmy.world ⁨3⁩ ⁨months⁩ ago

  having no fatigue limit is a bitch.

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  • mnemonicmonkeys@sh.itjust.works ⁨3⁩ ⁨months⁩ ago

    While I agree, I do have to clarify rhat there is a fatigue limit, it’s mainly that the limit for steel increases so fast that few people are willing to put in the testing for billions of cycles to model ultra-high cycle fatigue

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    • Eheran@lemmy.world ⁨3⁩ ⁨months⁩ ago

      Where is that limit supposed to be? The line does not flatten, unlike that of steel. Which is a flat line from 1 million to 1 billion cycles. During the same number of cycles, aluminium drops from 25 to 14 ski, a loss of 44 %.

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• Maalus@lemmy.world ⁨3⁩ ⁨months⁩ ago

  Aluminium doesn’t get stronger on the welds like steel does, it gets weaker. So if you screw them up, you end up with a two part bike

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  • MightyCuriosity@sh.itjust.works ⁨3⁩ ⁨months⁩ ago

    Weaker or more brittle?

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    • Maalus@lemmy.world ⁨3⁩ ⁨months⁩ ago

      Weaker, by like 50%. Welding aluminium isn’t worth it most of the time, just use steel if you need that. Otherwise bolt it together.

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• BastingChemina@slrpnk.net ⁨3⁩ ⁨months⁩ ago

  I love my steel bike, it’s great on the road, on gravel or for a quick grocery shop.

  I’m not gonna win any competition with it but it is honestly such a fun bike.

  And with care it should last forever.

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• tissek@sopuli.xyz ⁨3⁩ ⁨months⁩ ago

  And now I’m back to looking at steel (and titanium) adventure hardtails…

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