Well Inge,
That tells you the direction of the last train, but not of the next train coming.
Werner
-----Original Message-----
From: Inge <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, 24 Apr 2009 3:51 pm
Subject: Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?
Yes, you probably can. By means of a microscopic sample, it ought to be
possible to see in a SEM. When the steel wheels pass, nanosized friction
weldings are created. When the last wheel pass, these tiny weldings are
broken. The way the fractures look will tell in what direction the wheel
moved. But it's a bit of expensive way. A timetable is cheaper.?
?
Inge?
?
----- Original Message -----
From: "Douglas Pauls" <[log in to unmask]>?
To: <[log in to unmask]>?
Sent: Thursday, April 16, 2009 10:20 PM?
Subject: Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid??
?
> Well Dave, just remember this bit of wisdom - you can't tell which?
> direction a train was movin' from the tracks.?
>?
> Doug Pauls?
> Rockwell Collins?
>?
>?
>?
> "David D. Hillman" <[log in to unmask]>?
> Sent by: TechNet <[log in to unmask]>?
> 04/16/2009 02:53 PM?
> Please respond to?
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to?
> [log in to unmask]
>?
>?
> To?
> [log in to unmask]
> cc?
>?
> Subject?
> Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid??
>?
>?
>?
>?
>?
>?
> Hi Joyce! Authority??????? I am just a lowly engineer trying to find the?
> light at the end of the tunnel without having all the alligators in the?
> swamp get me first. My luck will be that the light at the end of the?
> tunnel is Doug driving a train!?
>?
> Dave?
>?
>?
>?
> Joyce Koo <[log in to unmask]>?
> Sent by: TechNet <[log in to unmask]>?
> 04/16/2009 02:48 PM?
> Please respond to?
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to?
> Joyce Koo <[log in to unmask]>?
>?
>?
> To?
> [log in to unmask]
> cc?
>?
> Subject?
> Re: [TN] Gold/Tin Intermetallics, why are we afraid??
>?
>?
>?
>?
>?
>?
> Ha, the authority is spoken!?
>?
> -----Original Message-----?
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman?
> Sent: April 16, 2009 3:32 PM?
> To: [log in to unmask]
> Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid??
>?
> Hi Joyce - my response would "it depends" (and Doug gets another Diet?
> Mt.?
> Dew) as Rockwell Collins utilizes immersion silver pwb surface finishes?
> on?
> many IPC Class 3 type products with no reliability issues.?
>?
> Dave?
>?
>?
>?
> Joyce Koo <[log in to unmask]>?
> Sent by: TechNet <[log in to unmask]>?
> 04/15/2009 04:11 PM?
> Please respond to?
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to?
> Joyce Koo <[log in to unmask]>?
>?
>?
> To?
> [log in to unmask]
> cc?
>?
> Subject?
> Re: [TN] Gold/Tin Intermetallics, why are we afraid??
>?
>?
>?
>?
>?
>?
> "ImAG finishes have a 12-month shelf life in a controlled environment?
> (<35[degrees]C/<85[degrees] RH), which can be significantly shortened?
> when exposed to air pollution with high sulfur and chlorine content.?
> Silver embrittlement Embrittlement?
>?
> A general set of phenomena whereby materials suffer a marked decrease in?
> their ability to deform (loss of ductility) or in their ability to?
> absorb energy during fracture (loss of toughness), with little change in?
> other mechanical properties, such ([Ag.sub.3]Sn intermetallics) of?
> solder joints may occur when the finish thickness exceeds IPC-4553?
> recommendations and Pb-free, high silver content solders are used. ImAG?
> is not recommended for high-reliability assemblies that must meet?
> IPC-6010 Class 3 requirements, but is acceptable for Classes 1 and 2."?
>?
> http://www.thefreelibrary.com/Will+discoloration+tarnish+ImAg+reliabilit?
> y%3F+Watch+for+silver...-a0193896272?
>?
> -----Original Message-----?
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*?
> Sent: Wednesday, April 15, 2009 4:34 PM?
> To: [log in to unmask]
> Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid??
>?
>?
> Hi Vlad,?
> I cannot comment on your specific case, but look at the pics below to?
> see?
> Ag-embrittlement.?
> Sorry 'Netters, IPC strips pics.?
>?
> Werner?
>?
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