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Old 11-07-10, 05:37 PM   #1
kf6pfk
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Repairing a weld in a aluminum swing arm assembly

Hi all,
I am the owner of a Trek Y22 mountain bike. I have found a small crack that runs along one of the welds in the rear swing arm assembly near the pivot point. I like the bike, but have been told that the swing arm is no longer available. Could it be a reasonable repair for someone familiar with welding aluminum? I was going to try to find someone at one of our local small aircraft repair shops who might like to take it on. I fear that the heat generated when TIG welding the bad seam will knock everything out of alignment. If that happens, I have no way of getting things back to normal, so I don't know if it's even worth bothering with. Any ideas?
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Old 11-07-10, 06:54 PM   #2
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hard to say without seeing the creack. If you could find out the exact alloy, 7005 or 6061 or whatever that would be a big help for the welder. A good repair would be to fix the crack with a weld and to weld on a extra gusset on both sides of the swingarm to reduce the load....but a poorly shaped gusset could make it weaker..
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Old 11-08-10, 09:14 AM   #3
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I can't really tell by looking; so I've emailed Trek tech support for the answer.
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Old 11-08-10, 02:24 PM   #4
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From Trek TS " That is 6061 and then is annealed and aligned then aged to T6." , So it Sounds petty hard to fix to me.
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Old 11-16-10, 04:38 AM   #5
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Do you have any photographs?
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