April 3, 2005
Kester will no longer make HF-1189 flux since they can no longer get some of the chemicals that are used to make the flux.
----- Original Message -----
From: Stephen Gregory<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Friday, April 01, 2005 11:59 AM
Subject: Re: [TN] Heavy PCB Copper Wave Soldering...
Hi Bill,
I can't use a flux like HF-1189A since it is a ORH1 flux. The assembly
is class-3, and according to J-STD-001 you're only to use L0 or L1 fluxes.
I plan to flux the PTH liberally from the topside just before putting the
board
on to the conveyer. There's not a whole lot of through parts, just a lot of
pins.
The one big connector is a 300-pin connector, and then I have about 6
header
locations totaling around 60-pins.
It may not be as bad as I'm worried about, the 20-ounce copper plane has
been
relieved from all the PTH's. It's main purpose in life is for conduction
cooling. The
SMT went pretty well. I did a double-sided reflow, and I'm using a
selective wave
solder pallet.
I think the reflow went so well because the thick copper layers actually
helped the
PCB heat very evenly. My set-points for reflow weren't radically different
except at
the last few zones...my last three zones were set 200 C., 215 C., and 245
C., upper
and lower zones. The first 7 zones ramped-up in a ramp-to-spike type of
profile.
I have a OmniFlo-10. I did slow my belt speed down to 26-inches per minute
from
my normal 32-inches per minute that I use for most everything else.
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
|---------+---------------------------->
| | Bill Kasprzak |
| | <[log in to unmask]<mailto:[log in to unmask]>|
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| | 04/01/2005 09:13 |
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>--------------------------------------------------------------------------------------------------------------|
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| To: [log in to unmask]<mailto:[log in to unmask]> |
| cc: |
| Subject: Re: [TN] Heavy PCB Copper Wave Soldering... |
>--------------------------------------------------------------------------------------------------------------|
Steve,
My approach on a board like this might include the use of a water based
water soluble flux like, HF-1189A. This way you can preheat your board in
an oven prior to wave then still apply flux without vaporizing it.
It'll be interesting to see how you handled these monsters. Keep us
posted. Good luck.
Bill Kasprzak
Moog Inc
Process Engineer, Electronic Assembly
Stephen Gregory <[log in to unmask]<mailto:[log in to unmask]>>
Sent by: TechNet <[log in to unmask]<mailto:[log in to unmask]>>
03/31/2005 05:41 PM
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Subject
[TN] Heavy PCB Copper Wave Soldering...
Hi Ya'll!!
I just thought I'd share what is going to make things a little
more interesting for me here at work over the next couple
of days...
Go to: http://www.stevezeva.homestead.com<http://www.stevezeva.homestead.com/> and look at;
"Heavy Metal", Heavy Metal 2, and Heavy Metal 3. This
an assembly that I will be wave soldering, that has two 20-ounce
layers of copper on layers 2 and 11 (this is a 12-layer board).
I may be asking for some help for this...
My first try is to preheat and bake the assembly in a oven close
to the wave solder machine at 150 C., and then quickly remove
it from the oven, get it into the wave as soon as I can before it has
a chance to cool down, and see what kind of barrel fill I get.
I'll let you all know if this works, or I may be asking for some
help...
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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