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God damnit, that was an expensive ride.
Now I’m trying to find one identical to this so I can use it for parts. I just hope this isn’t a common issue with this frame and that I just got unlucky with mine.
Would’ve been an easy fix if the frame were steel - but from what I understand, welding isn’t really an option with these alloy frames.
Preheat, expansion contraction control , and post heat is needed. But you wouldn't have to heat treat the entire frame, just this area/members of the weld. There are specialized welder dudes that you can probably find, but if its breaking from factory it will need extra gussetting. The pictures I saw the angled arm going up to seat post is more flat than vertical. Rather than bump force going up to the seat neck, it looks like it acts as a fulcrum and the bump would stretch the lower arm instead
This, if the factory can do it then a skilled craftsman can as well. Talk to some local fab shops, I'm sure you can find someone skilled in AL welding that can fix you up