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Plating Zodiac landing gear

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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

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

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)

  

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larry(at)macsmachine.com
Guest

Posted: Sat Jul 29, 2006 5:59 am Post subject: Plating Zodiac landing gear

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

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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