Morning Jon:

For any rework (lead free presenting a variety of other potential issues such as copper dissolution for PTHs, delamination, BGA issues such as HIP or pad cratering) the general idea is to remove the solder using some method such vacuum systems or  solder wicking, clean the site place the component and then apply new solder.

There are some cases where new solder would not be added and you could get away with NO solder removal.

If you are mixing alloys then the process changes.

Bob Wettermann

BEST INc
PH 847-767-5745

--- On Thu, 3/11/10, Roberts, Jon (SA-1) <[log in to unmask]> wrote:

From: Roberts, Jon (SA-1) <[log in to unmask]>
Subject: [TN] LEAD FREE REWORK QUESTION
To: [log in to unmask]
Date: Thursday, March 11, 2010, 8:31 AM

Good morning to all, I recently purchased a Lead Free Training
materials. I was asked to provide lead free training to a very small
number of operators.  During the presentation of that purchased training
material it stated in order to rework a solder connection, you remove
the solder and component.  Then you reinstall and solder (called
remanufactured).  Is that the best way and if so why?   Maybe Werner
will know and any of you that are doing lead free soldering and have to
rework.  Doing our design stage (IR&D) for new products we are going
toward lead free and engineering needs parts changed or add mod wires
prior to qual testing).  Thanks, Jon


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