Have you tried top fluxing? Yes, preheating a thick board in an
oven improves the solder flow to the top, making sure that the boards go
from the oven to the wave without cooling off.
Regards,
Ramon
> -----Original Message-----
> From: Steve Gregory [SMTP:[log in to unmask]]
> Sent: Monday, April 07, 2003 10:36 PM
> To: [log in to unmask]
> Subject: Re: [TN] Wave soldering - Spray fluxer parameters
>
> Hi Peter!
>
> Not knowing what type of spray-fluxer you have, I'll tell you what I do
> here with the Opti-flux system I have...it's a ultra-sonic fluxer.
>
> What I look for is coverage first of all. That's easily checked by either
> using a piece of cardboard, or with kraft paper taped to the fixture
> you're using, that corresponds to the width of the conveyer. Then just run
> it through the fluxer with the heaters off. Take a look at the spray
> pattern and look for even coverage.
>
> With my spray fluxer I can adjust what's called the traverse speed, which
> controls how fast the spray head passes back and forth. If I run the main
> conveyor speed a little fast, I may need to increase the spray fluxer
> traverse speed so that there's even coverage...it's always worked for me.
>
> That being said, I'm running into a challenge with a big, thick (.125"),
> heavy back-plane that I'm trying to wave. It's a class-3 assembly, and
> having a hard time getting good top-side fillets. Gonna try pre-heating
> the assembly in a oven, taking it out and getting it into the wave before
> it has a chance to cool down a whole lot. I've tried playing with
> pre-heat, conveyer speed, etc...but it seems everything that I try to do
> on the wave, seems to dry-out, or kill the flux...
>
> Maybe someone has another suggestion...BTW, I have an Electrovert Electra.
>
> -Steve Gregory-
>
>
>
> Technet,
>
> Can anyone recommend a process for setting up the operating
> parameters
> for the spray fluxer?
>
> How can one verify the optimum amount of flux is being applied to
> the
> pcb prior to the board going through solder wave?
>
>
> Rgds,
> Peter
>
>
>
>
>
> -Steve Gregory-
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