Re: control arm failures - Saab 900 Bulletin Board - Saabnet.com
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A good visual inspection will show a problem. If there is a groove you can catch a fingernail in at toe of weld - where weld metal stops and base metal begins there is undercut and that can cause failure. Not to be tolerated on that thin a metal.
Weld should be flat across from toe to toe or up to + 10% convex -humped up. (AWS-- American Welding Society) sheet metal spec).
If the weld was done downhill or too fast it will leave a concave bead which will crack in middle. If weld is too humped up it will crack at weld metal to base metal.
On that thin a metal heat treating has no benefit. The weld failures of that type I have seen on buses are either from going too fast too hot (pure CO2 shielding gas)or design size is too small for the job.
Any slippage around the thru bolts would allow the arms to work back and forth with respect to one another and also cause a fatigue (over a long time), failure. Or all of the above as usually happens in the real world.
Posts in this Thread:
- Unscientific control arm poll, SISteve
, Thu, 27 Jan 2011 16:09:42- Re: Unscientific control arm poll, peter charak, Fri, 28 Jan 2011 19:43:36
- Re: Unscientific control arm poll, incorvati
, Fri, 28 Jan 2011 16:21:29 - control arm failures, Jon
, Fri, 28 Jan 2011 09:26:27 - Here is the thing though, SWEDECAR
, Fri, 28 Jan 2011 09:01:45 - Re: Unscientific control arm poll, Nak, Thu, 27 Jan 2011 18:00:40
- Re: Unscientific control arm poll, SWEDECAR
, Thu, 27 Jan 2011 17:28:20 - @ 220,000, vvack0matic
, Thu, 27 Jan 2011 17:00:25 - Re: Unscientific control arm poll, 900 Aero
, Thu, 27 Jan 2011 16:27:22
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