Today's Message Index:
----------------------
1. 05:22 AM - Re: Overlays (Richard Mutzman)
2. 11:49 AM - Re: Re: Overlays (teamgrumman@aol.com)
3. 02:39 PM - Metal to Metal bonding (teamgrumman@aol.com)
Message 1
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Gary=2C
Got the message on the overlay and eyebrow.
I am familiar with the Kokaska overlay=2C but what is different about the g
auge openings. Are you referring to the engine gauges and the metal betwee
n the individual gauges?
Richard Mutzman
N399RM
Dayton=2C OH (Home of AYA 2010)
=0A
_________________________________________________________________=0A
Hotmail: Powerful Free email with security by Microsoft.=0A
Message 2
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my overlay has individual openings for the gauges.
-----Original Message-----
From: Richard Mutzman <rcmutz@msn.com>
Sent: Mon, Oct 12, 2009 5:22 am
Subject: TeamGrumman-List: Re: Overlays
Gary,
?
Got the message on the overlay and eyebrow.
?
I am familiar with the Kokaska overlay, but what is different about the gauge openings.?
Are you referring to the engine gauges and the metal between the individual
gauges?
Richard Mutzman
N399RM
Dayton, OH (Home of AYA 2010)
Hotmail: Powerful Free email with security by Microsoft. Get it now.
Message 3
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| Subject: | Metal to Metal bonding |
I was lucky enough, last night, to get an email and learn that alodining the aft
end for M2M bonding was a waste of time because it won't work. ?The argument
was that only anodizing will work. ?Anodizing is out of the question. ?So, last
night I agonized and spent 5 hours on the internet learning about all sorts
of surfaces preparations for M2M bonding. ?
I've included the .pdf file for the Hysol 9330. ?This is the adhesive I chose for
bonding the horizontal braces. ?On the second page, there is a heading that
starts out ...
Bond Strength Performance
Tensile Lap Shear Strength
Tensile lap shear strength tested per ASTM D1002 after curing as shown below. Adherends
are 2024-T3
Alclad aluminum treated with chromic acid etch.
Clearly, chromic acid etch is not anodizing. Read the bond strengths of the various
surface preparations. ?The bond strength is 5,000 psi when cured at 77 degrees
for 7 days. ?The worse case is MEK wipe only (3900 psi). ?The reason I made
the vertical braces 3/8 inches wider was to compensate for any reduction is
bonding. ?The thought being that, at the low end, MEK wipe = 3900 psi shear
strength, the wider surface would still be stronger than the original bonded vertical
brace. ?
This morning I talked to a structural engineer at Henkel, the supplier of the Hysol
9330, and was told that the process I did should be OK. ?"Should" ?She told
me that they haven't done a lot of testing with Alodine because there isn't
much call for it. ?BUT, she told me their results show the bond to be a lot better
than with a straight chromic acid etch. ?Not as strong as the 5700 psi with
anodizing, but a lot stronger than an MEK wipe. ?
I also found where B-52s, F-22s, F-16s and the like are being field repaired with
Hysol 9330 using a fairly new surface preparation process, developed by Boeing,
called Sol-Gen. ?I have a call into a Boeing engineer regarding that for
use in our planes.
Gary
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