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October 2004

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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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Wed, 27 Oct 2004 15:53:15 -0400
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Leland,

I used to try to save flux and program the selective spray fluxer to spray
only the thru pockets on the wave solder fixture.  The problem occurs with
all the composite materials I've tried.  Also a problem on titanium and
anodized aluminum

However, I had the same results.  In addition, the unfluxed portion of the
fixture do wear/burn quicker than the fluxed areas.

So, I've re-programmed the spray fluxer to spray the entire bottom* of the
fixture.

* Also, I'll program the wave to turn off/on only when needed (ie off at
beginning, on in middle, off at end).

Hope this helps,

Al Kreplick
Sr. Mfg. Eng.
Teradyne, Inc.
500 Riverpark Drive
Mail Stop NR500 1-1
North Reading, MA 01864
Tel: 978-370-1726
Fax: 734-661-5352
Pager: 888-561-6485




Leland Woodall <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/27/2004 03:40 PM
Please respond to TechNet E-Mail Forum; Please respond to Leland Woodall


        To:     [log in to unmask]
        cc:
        Subject:        [TN] Wave Solder Pallet Material Question


Hi Everyone,

In an attempt to reduce and/or eliminate solder contamination from our
wave
process, we're trying to identify a material that will resist solder
adhesion to our board carriers.

Although our present situation of contamination is minimal, any amount is
still too much.  We're using pallets made out of Durastone, which I
believe
is manufactured in France.  We contacted those folks, and they suggested
we
try coating the pallets with Teflon.

The resulting experiment didn't turn out as we'd planned.  Only the area
of
the pallet that was fluxed resisted adhesion, and the remainder continued
to pick up particulates (just about exactly opposite of my initial line of
thinking).

Does anyone have a suggestion?

Our current cleaning frequency is every five cycles through the wave,
which
will have to be modified if we can't solve the problem.

Thanks in advance,

Leland Woodall
Quality Coordinator
Keihin Carolina System Technology, Inc.

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