The documentation that was available with fusor listed sheer and tensile
strengths during crash testing and listed specific applications where it
could be used, the major one that I recall is replacement sheet metal in
collision situations. There are certainly enough planes and specialty cars
completely bonded together, but I'm not ready to bond structural parts, call
me old fashioned. I'm sure 3M has information available on exactly what
situations their epoxy is approved for.
James Nazarian
71 MGB Tourer
71 MGBGT V8
85 Dodge Ram
----- Original Message -----
From: "James J." <m1garand@speakeasy.net>
To: "James Nazarian" <jhn3@uakron.edu>; "Simon Austin"
<simon_mgb@hotmail.com>; <mgb-v8@autox.team.net>
Sent: Friday, July 04, 2003 8:31 AM
Subject: Now epoxy bonds, was Gauge Bezels
> Ah, Grasshopper, you must pause and consider..... A reinforced epoxy
> can have an ultimate strength far higher than steel and other exotic
> metals, but the limiting factor here is the bond between an epoxy and a
> metal surface. Epoxy w/o fiber reinforcement is often weaker than
> ferrous metals. There is no chemical or crystaline bonding between the
> epoxy and the substrate in this type of repair , just a 'bite' dependant
> on the surface roughness of the prepared metal. We're talking about
> adhesion vs. cohesion here. Welding literaly melts two like materials
> together, although the Heat ffected Zone (HAZ) is usualy weaker than the
> parent metal if the parent has had any heat treating.
> I think OEM's use it and approve epoxy only in places where welding is
> overkill. Epoxy bonding (between metal and metal) is applicable where
> brazing or soldering is acceptable, in my humble opinion based upon my
> observations (not having seen any OEM documentation describing their
> decision process). Having said that, some people have brazed entire car
> and airplane chassis to ease field repairs, so adhesive bonds can be
> quite strong, none the less.
> James J.
> p.s. I didn't mean the Grasshopper comment to be either serious or
> condesending, hope it didn't sound like either.
>
>
> James Nazarian wrote:
>
> >AFIK it is as strong or stronger then welding and is in wide use by both
> >OEMs and collision shops.
///
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