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March 2002

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Wed, 13 Mar 2002 11:32:07 EST
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I have used a Soft-Beam system for some limited rework as well as a medium
quantity production, in-line operation.  The key factors for using this
system included temperature sensitivity for surrounding components, high
thermal mass in the solder joints that needed selective soldering, components
that could be easily fixtured after insertion so that they did not fall out
when the board is inverted for the Soft-Beam operation.
In general the Soft-Beam performed fairly well.  The biggest hassle was the
calibration of the shutter cycle as the bulb aged.  Since that bulb reduces
in output over time, a calibration routine is required to ensure the process
remains stable.  For our process control limits, running the system 24/7,
that meant running calibration weekly on a new bulb, 2x weekly in mid bulb
life and 3-4x weekly toward the end of bulb life.
  Solder joint quality looked good in both visual inspection and
cross-section.  The ability to preheat each joint before applying solder
helped.  Of course that also adds to cycle time.

Jon Moore

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