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1996

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Subject:
From:
"John Guy" <[log in to unmask]>
Date:
Wed, 17 Apr 1996 09:54:55 +0000
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Leo, 	I have heard of some difficulties soldering to Alloy 42.  The
source of the problems is the alloy make up, the two major metals
being Nickel and Iron.  When this material oxidizes, it can be
difficult to impossible to get proper wetting.  In most cases the
problems occur on components that have be improperly plated or have
been on the shelf to long.  This allows oxigen to penitrate the
tin/lead plating and oxidize the base material.

	If you are getting good component lead finishes and don't have
these components in storage for extended periods of time you should
be OK. If you need to hold then in storage, you may want to fuse or
pre-tin the leads.  This will reduce the porosity of the finish and
extend the storage life of the components.  It will also prevent bad
components from entering the manufacturing line.  This, however, adds
one or more steps to the manufacturing process.




> Date:          Tue, 16 Apr 1996 17:07:33 -0500
> To:            [log in to unmask]
> From:          Leo Reynolds <[log in to unmask]>
> Subject:       Alloy 42

> We have a customer who says that a previous supplier had problems soldering
> some fine pitch components (15 mil) because the lead material was "Alloy
> 42".  They had a tin/lead coating (85/15).  They were also told that many
> component mfgrs are going to be using this material.
> 
> We are not familiar with this lead material but since it is solder coated do
> not hink it should be a problem.  Anyone have any knowledge or experience in
> this area?  
> 
> Thanks in advance for your consideration.
> 
> Leo Reynolds
> Electronic Systems, Inc.
> 
> 
Sincerely,
John Guy
E-Mail: [log in to unmask]

Sincerely,
John Guy
E-Mail: [log in to unmask]



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