Hi Bev - Oops, I didn't mean to imply the using a soldering iron for solder
joint touchup would be a benign, totally safe activity. There have been
numerous studies showing the the potential for assembly damage greatly
increases when a touchup operation is conducted. Operator experience,
soldering iron properties and the type of board material would all come
into play as to the possible damage that could results from a solder joint
touchup operation.

Dave Hillman
Rockwell Collins
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[log in to unmask] on 10/23/97 12:28:47 PM

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cc:    (bcc: David D Hillman/CedarRapids/Collins/Rockwell)
Subject:  Re: [TN] [TECHNET] ASSY: Solder compatibility




Dave, Sheila,
Although soldering irons can certainly melt the 95/5 solder isn't there
an increased risk of damage to the board because of the application of
the higher temperature to the FR-4?
Bev Christian
Nortel
[log in to unmask]
>----------
>From:  David D Hillman[SMTP:[log in to unmask]]
>Sent:  Thursday, October 23, 1997 11:59 AM
>To:    [log in to unmask]
>Subject:       Re: [TN] [TECHNET] ASSY: Solder compatibility
>
>Hi Sheila - a  question - do you know that the voids are detrimental to
>solder joint reliability? Also mixing of 95/5 with Sn62 is probably not
>going to give you an intermetallic issue but you will probably get a
>reeeaallly neat solder joint composition which will be very hard to
predict
>any type of properities data or even a simple melting point. If you must
do
>touchup why not use 95/5 as the touchup alloy? Soldering irons can melt
>that alloy.  Good Luck.
>
>Dave Hillman
>Rockwell Collins
>[log in to unmask]
>
>
>
>
>
>[log in to unmask] on 10/21/97 10:05:36 AM
>
>Please respond to [log in to unmask]; Please respond to [log in to unmask]
>
>To:   [log in to unmask]
>cc:    (bcc: David D Hillman/CedarRapids/Collins/Rockwell)
>Subject:  [TECHNET] ASSY:  Solder compatibility
>
>
>
>
>Hello TechNet ..
>Does anyone have any experience with possible intermetallics formation if
I
>use Sn62Pb362Ag to touchup voids in a Vapor phase reflowed Sn95Sb5 solder
>joint ???  Especially after 100 temp cycles from -55C to 120C?  Thanks for
>any help!
>Sheila Smith, Tracor AES
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