Hi Siggi! We ran one of the few full tunnel wave solder machines (that I
knew were in use in the industry) for 8 years very successfully. The
advantages were great thermal characteristics and  low nitrogen
consumption. The disadvantages were no visibility of the assemblies and
more complicated maintenance efforts. We just replaced our full tunnel with
a nitrogen-at-the-wave system - our testing did not show any major
advantage between the newer machine and the older machine - we consume a
bit more nitrogen but overall the systems performed equally well. The type
and volume of the assemblies you intend to process may dictate the machine
characteristics more than your nitrogen consumption parameters. Good Luck.

Dave Hillman
Rockwell Collins
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                      "Zweigart,
                      Siegmund"                 To:       [log in to unmask]
                      <SiegmundZweigart@        cc:
                      HG.SLR.COM>               Subject:  [TN] Wave soldering / Closed open N- Tunnel systems
                      Sent by: TechNet
                      <[log in to unmask]
                      ipc.org>


                      07/02/2003 09:54
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to
                      "Zweigart,
                      Siegmund"






Hello all

We are looking about the differences in lead free wave soldering in regard
to different wave systems.
Do somebody know of any experiments regarding different ppm levels if
closed
(tunnel system) and open N- systems are compared?
Are ther any differences in Solder Quality in regard to differnt O- levels
in N?

Thanks for your answers

Siggi

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