Hi Neil! I recommend you take a look in JSTD-002B, section 4.3 for
information on wetting balance testing. Currently the wetting balance
testing procedure is a test without established accept/reject criteria. The
wetting balance test methodology in JSTD-002B does include some suggested
criteria which can be used. A number of companies are currently using the
wetting balance methodology as their solderability test method as they have
created agreed criteria values between themselves and their component
fabricators. The JSTD-002 committee is currently looking at creating
industry acceptable wetting balance accept;/reject criteria limits but it
is too early in the studies to know if we can achieve valid limits for
industry wide application.

Dave Hillman
JSTD-002 CoChair
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                      Neil Flatter
                      <Neil.Flatter@TRW        To:       [log in to unmask]
                      .COM>                    cc:
                      Sent by: TechNet         Subject:  [TN] Wetting Balance Testing
                      <[log in to unmask]>


                      05/08/2003 12:17
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to Neil
                      Flatter






For those of you doing solderability testing, what sorts of parameters
should we be concerned about for reliable results?  Our tester already
allows inputs for lead perimeter, cross sectional area, and hang time.  My
company's testing also specifies immersion angle, depth, and speed as well
as the type of flux.  By controlling these factors, can I expect repeatable
results?

It has been suggested that we also need to limit the length of the leads
for our testing as wall as installing a thermal break between the lead and
the hanger.  Both have been blamed for failing test results.  Has anyone
experienced changes in test results from these variables?

Neil Flatter
TRW-Automotive
Process Quality

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