Frankenstein
Deceased - Frankenstein 1991 - 2018
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- Joined
- Jun 24, 2016
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- 5,035
Not the best place for this question but I consider welding to be a frame related task at times, and my main idea involves jb weld..
So if anyone has seen my downtube they'd notice it's missing about half of it, now none of my friends seem to be eager to jump on the bike, even without the engine installed.
Now I understand why, it's missing a lot of tube, anyway the areas I am bolting to are obviously no longer solid hollow tube one side to the other and they also are slightly indented at the 3rd clamp on each side since there is no metal tube in it to brace it, only on the 2 inner clamps on each side.
I glossed over more than a half a dozen research papers, including 2 from asce, all related to circular steel tubing filled with concrete, but with various adaptions of steel rebar type cages embedded in the concrete, overall those designs are capable of maintaining notable structure and rigidity beyond the failing point of the steel tube, which otherwise would have collapsed.
So those ends of my downtube could in theory be filled with jb weld which is rather robust I've found against chipping and crushing to a certain degree, and inside that epoxy I would simply put many (like probably 40 or 50) thin steel rods (or maybe do something with my excessive spoke supply) to act as the "cage" many of these models use to help keep things in shape.
Anyone have an idea if this would be a good thing to do? I've read that some even used steel fiber (whatever that is, combed out steel wool I guess if the researcher had time) as a reinforcement on concrete members which showed to work well. It shouldn't crack very easily, actually I imagine that the steel tube would be practically bullet proof if not actually literally bullet proof after such a treatment.
A side goal is to do this to basically any hollow part of the frame, including chain stays if I can find a way to do it without weakening it at a critical spot, then again nearly any hole I make and eventually fill to the top with epoxy could be quickly sealed over with a tig welder and forgotten about...
Anywho I'd feel a mighty more confident without the idea that the tube will collapse from bending forces should a supportive bar or plate decide to come loose.
I'll also be able to drill holes in my frame at will at that point basically without any reserve if it's not next to a weld connecting 2 different tubes.
So if anyone has seen my downtube they'd notice it's missing about half of it, now none of my friends seem to be eager to jump on the bike, even without the engine installed.
Now I understand why, it's missing a lot of tube, anyway the areas I am bolting to are obviously no longer solid hollow tube one side to the other and they also are slightly indented at the 3rd clamp on each side since there is no metal tube in it to brace it, only on the 2 inner clamps on each side.
I glossed over more than a half a dozen research papers, including 2 from asce, all related to circular steel tubing filled with concrete, but with various adaptions of steel rebar type cages embedded in the concrete, overall those designs are capable of maintaining notable structure and rigidity beyond the failing point of the steel tube, which otherwise would have collapsed.
So those ends of my downtube could in theory be filled with jb weld which is rather robust I've found against chipping and crushing to a certain degree, and inside that epoxy I would simply put many (like probably 40 or 50) thin steel rods (or maybe do something with my excessive spoke supply) to act as the "cage" many of these models use to help keep things in shape.
Anyone have an idea if this would be a good thing to do? I've read that some even used steel fiber (whatever that is, combed out steel wool I guess if the researcher had time) as a reinforcement on concrete members which showed to work well. It shouldn't crack very easily, actually I imagine that the steel tube would be practically bullet proof if not actually literally bullet proof after such a treatment.
A side goal is to do this to basically any hollow part of the frame, including chain stays if I can find a way to do it without weakening it at a critical spot, then again nearly any hole I make and eventually fill to the top with epoxy could be quickly sealed over with a tig welder and forgotten about...
Anywho I'd feel a mighty more confident without the idea that the tube will collapse from bending forces should a supportive bar or plate decide to come loose.
I'll also be able to drill holes in my frame at will at that point basically without any reserve if it's not next to a weld connecting 2 different tubes.
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