Below are the parameters that our wave operator reported.

Flux: No-clean Indium 3590-TX 

The following are conveyor speeds and what they yield:

        6.0 FPM yields a topside temperature of 206 Degrees F and a
solder  dwell of 1.1 S. (via wave optimizer readings)

        5.0 FPM yields a topside temperature of 223 Degrees F and a
solder  dwell of 1.4 S. (via wave optimizer readings)

Preheat temps are 700 degrees F (zone 1) and 750 degrees F (zone 2)

Solder temp is 500 degrees F 

I have used immersion depths of 0.032 and 0.024 for this assembly.

Rich

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, July 23, 2004 9:16 AM
To: [log in to unmask]
Subject: Re: [TN] Solder Bridging on a Thru-hole connector

Hi Rich!

Finally got your picture, and it's posted. Go to:

http://www.stevezeva.homestead.com/files/Solder_Bridging.jpg

This picture is pretty blurry, but it's clear enough to see that you
shouldn't be having bridging problems with this connector. It's a
standard-pitch
dual-row connector, and there shouldn't be bridging problems with it.

Can you share with us the parameters for the wave that you're using?

Belt speed?
Pre-heat temperature?
Pot Temperature?
Flux Type?

I see from your web page that you have an Electrovert Econopak Plus 400
wave
machine, with a Sonotech spray fluxer. This machine should be capable of
waving that connector without bridges.

In the meantime, here's a link that has a pretty good troubleshooting
guide
for wave soldering defects. It's based on IPC-S-816. It's not the
end-all for
troubleshooting problems, but a good starting point.

http://www.ecd.com/retrieveFile.asp?file=WS_Expert_Guide.pdf

-Steve Gregory-


> Hello everyone,
>
> I am currently encountering a wave solder issue that I would like to
ask
> your opinion about.  I have a dual row connector (Molex part #
> 70246-1621) that accumulates soldering bridging in a group of three.
I
> sent Steve an e-mail to see if he could post the picture on his
website
> so hopefully he can but until then I'll try and give you a generic
idea
> of how it is bridging.  (The "arrow's" below represent the bridging
> between the leads)  The wave operator has tried different speeds and
> board directions but continues to struggle with this particular
> connector.
>
> If anyone has any input I would appreciate it.
>
> TIA,
>
> Rich
>


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