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grs-pms(at)comcast.net
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 Posted: Fri Jul 28, 2006 6:38 pm Post subject: Plating Zodiac landing gear |
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I remember from my days as a Boeing engineer that 4130N steel is not subject to embrittlement from plating, but I don't have access to the material and process handbooks anymore to be sure about it. Maybe someone on the list can can put their hands on this kind of information and clear the issue up. Anybody...?
George
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kellymeiste(at)jcwifi.com
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| Posted: Sat Jul 29, 2006 5:16 am Post subject: Plating Zodiac landing gear |
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Hi George,
At my previous employer we used to have problems with hydrogen embitterment in all types of steel (CR, HR, spring/ music wire, and tool steels) after plating. We finally solved this problem by making sure the product was placed in an oven within 15 minutes after plating, and then baked for 2 hours at temp of 350 deg F.
Problem solved.
Kelly Meiste
601 HD with plated 6L3 main gear lower bearing supports (140 hours)
[quote] ---
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larry(at)macsmachine.com
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| Posted: Sat Jul 29, 2006 5:59 am Post subject: Plating Zodiac landing gear |
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George,
I believe you're correct, but the weld causes metal to change just a
little and the touch downs and hard braking or turning are what cause
the edge of the weld to begin to
crack. The hydrogen imbrittlement would act on the weld material and
perhaps shorten the time between use and breakage. I believe we're
getting between 100 hours
and 300 hours on these gear plates when they let go. The very slight
bending is a repeating action that takes a bit of time to get a crack
started. It's probably worse
for the heavier 601s like mine that have got a 730 lb empty weight, so I
try to grease it on and not brake hard until the inertia is pretty well
spent.
Larry McFarland - 601HDS at www.macsmachine.com
George Swinford wrote:
| Quote: | I remember from my days as a Boeing engineer that 4130N steel is not
subject to embrittlement from plating, but I don't have access to the
material and process handbooks anymore to be sure about it. Maybe
someone on the list can can put their hands on this kind
of information and clear the issue up. Anybody...?
George
Do not archive
|
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