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August 2000

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Subject:
From:
"Kasprzak, Bill (esd) USX" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 Aug 2000 12:53:27 -0400
Content-Type:
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text/plain (186 lines)
Hans:

When I instrumented  the board it seemed like the temp on the board
stabilized after about a half hour to 45 minutes in the oven. I added a bit
of time to accomodate traffic in and out of the oven.

Bill K.

> -----Original Message-----
> From: Hinners Hans Civ WRALC/LYPME [SMTP:[log in to unmask]]
> Sent: Wednesday, August 16, 2000 12:41 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Wave soldering ancient designs...
>
> Hi Bill,
>
> How'd you arrive at an hour for preheat time?
> (Why question it, Hans, it works, run with it.)
>
> Since we only have bottom side preheat our assemblies get baked in an oven
> too - pallet and all.
>
> Hans
>
> ~~~~~~~~~~~~~~~~~~~
> Hans M. Hinners
> Materials Engineer (Process & Manufacturing)
> Warner Robins Air Logistics Center
> Avionics Production Division
> Manufacturing Branch
> 380 Second Street, Suite 104
> Building: 640, Mail Stop: LYPME
> Robins AFB, GA 31098-1638
> Voice: (478) 926 - 1970 Fax: (478) 926 - 7164
> mailto:[log in to unmask]
> http://www.robins.af.mil
>
>
> -----Original Message-----
> From: Kasprzak, Bill (esd) USX [mailto:[log in to unmask]]
> Sent: Wednesday, August 16, 2000 11:57 AM
> To: [log in to unmask]
> Subject: Re: [TN] Wave soldering ancient designs...
>
>
> Steve:
>
> I kept my nose outta your problem with respect to not getting solder joint
> topside fillets on selected connections because I wanted to see if your
> problem could be solved by folks who use RMA fluxes. Seeing that you're
> still in deep doodo, I'll offer the following:
>
> I have several different "backpanel" that are .095 thick PWB's with heavy
> heatsink holes in certain areas on the board. I am able to wavesolder
> these
> boards quite easily by using a flux that is water-based instead of alcohol
> based.
>
> What I do is pre-heat my loaded assembly in an oven at about 190 - 200
> deg.
> F for about an hour. From the oven the "hot" assembly is transported
> directly to my conveyor on my wave machine. I manually spray the bottom of
> the board with my water based flux (Kester HF-1189A) and send the board on
> its merry way through my regular soldering process on my ancient Treiber
> Wavesolder machine. Results are usually pretty good. Seems that the water
> based flux takes longer to dry out as opposed to the alcohol based flux
> and
> is still quite active at the wave.
>
>  The only other process I can suggest is a vapor phase process which is
> not
> too common anymore.
>
> You can contact me off line via e-mail or give me a call. I can fill you
> in
> on details.
>
> Yes, this board is for a High-Rel Mil program.
>
> Just my two-cents worth.
>
> Bill Kasprzak
> Moog Inc.
> 716-652-2000 ext 2507
> > -----Original Message-----
> > From: Stephen R. Gregory [SMTP:[log in to unmask]]
> > Sent: Tuesday, August 15, 2000 9:58 PM
> > To:   [log in to unmask]
> > Subject:      [TN] Wave soldering ancient designs...
> >
> > Hey all...
> >
> > The last couple of weeks have been interesting to say the least as far
> as
> > my
> > wave soldering goes...(Hey Joyce! Any openings at your new
> > place?...gofer',
> > janitor, anything?... ;^)...).
> >
> > You may have read about my problems with the way pins connect to inner
> > planes
> > and all that, but now the last few days I've been trying to wave
> > assemblies
> > that have metal heat-sinks bonded to the top of the PCB with the PTH
> > components installed on top of the heat-sink and then into the PCB...
> >
> > Again, I've tried everything that my feeble mind (at this point) can
> > possibly
> > do to wave these bloody things...
> >
> > I'm thinking that designs such as these cannot be wave soldered with any
> > good
> > results. Am I wrong in thinking that? Do these designs have to be hand
> > built?
> > Am I just spinning my wheels trying to wave solder them?
> >
> > Gawd, I'm getting beat-up by so many people because I can't figure out
> how
> > to
> > wave these pieces of...of...of..."work"...
> >
> > -Steve Gregory-
> >
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