Neil,
        You should not have to crank up the pressure more than about
8-9psi for no-clean, anything more is counter-productive. but do
probably need to slow down the traverse speed a fair amount. We are
sometimes using Alpha NR300A2 on our Electras without any major issues,
but it took a little tweaking during initial process setup. Your
Electrovert tech should have helped you establish your setup during
install, call them for help. Or maybe Ken Kirby will see this and be on
the case....

Mike McMonagle
PCA Process Engineering Supervisor
K*Tec Electronics
1111 Gillingham Lane
Sugar Land, TX  77478
(281) 243-5639 Phone
(281) 243-5539 Fax
[log in to unmask]

> -----Original Message-----
> From: Neil Maloney [SMTP:[log in to unmask]]
> Sent: Wednesday, June 16, 1999 10:00 AM
> To:   [log in to unmask]
> Subject:      [TN] Spray fluxing...........How do you do it right
>
> Greetings, Technet!
>
>   I have more growing pains. Two weeks ago, we replaced our old
> stone-age
> Hollis Wave solder machine with a new Electrovert. The old machine had
> an
> air-stone/foam/bubble/"Lawrence Welk" type flux applicator. The new
> machine
> has a nitrogen-pressurized/tank-type/reciprocating/"Al Capone" style
> flux
> sprayer. (The Electrovert "Supa-Flux") Our problem is that we are not
> getting good solder fillets on the top side of our assemblies. It is
> as if
> the flux is not getting up into the holes of the boards. If the
> machine
> operator manually squirts the top side of the boards with a spray
> bottle as
> the go into the machine, we get good wetting and quality joints, likt
> we
> used to get with the air stone.
>     We are using a low-solid "no clean" flux (Alpha SLS 65, the same
> type as
> before with the old machine), we are spraying at maximum pressure (50
> psi),
> at minimum spray head traversing speed (11 ips). I believe that we are
> putting as much flux onto the boards as the spray head can deliver.
>    Is this a flux viscosity issue, or a spray head issue or something
> else?
> What can I do short of handing everybody a squirt gun to flux the
> board
> tops?
>
> BTW- We decided to keep the new solder pot hot all the time. Thanks
> for all
> your input on this matter.
>
> Regards,
>
> Neil Maloney
> Service Technician
> Contemporary Controls
> http://www.ccontrol.com
>
> [log in to unmask]
>
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