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October 1999

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Subject:
From:
Pat Kane <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 7 Oct 1999 10:15:51 EDT
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Miguel,

The first place to investigate would be your soldering iron tip temperature.
With no-clean/low residue materials, tip temperature should be between
600-700 degrees F.  If the tip temperature exceeds 700F, you will heat this
flux too rapidly, causing it to "explode" of sorts, resulting in the splashes
you are experiencing.  With NC/LR materials, a good heat bridge must be made
prior to applying solder to the connection point.

In product failure analysis evaluations we have done, there is usually some
evidence of "charring" when the tip temp is too high.  This would look like a
black residue (burnt flux) around the joint area, possibly contained in the
splashed material also.
Hope this helps.

Pat Kane
Contamination Studies Laboratories

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