Quite often these pots are set high (typically 400 degC) because they are
sometimes used to tin enamelled wire on coils etc.  The high temperature is
needed to burn the enamel off during the soldering process.

If you do any of this type of work on-site, it may explain the high
temperatures being used.

On the other hand it is probably just down to people not realising the
problems they are causing by raising the temperature to this level.

The only way to handle temperature control properly is to lock out the
controls to the operators.  You still need to educate them so they
understand why the temperature is fixed but if you don't lock the
temperature control out you will find it keeps creeping up...!


Neil

 -----Original Message-----
From:   tony steinke [mailto:[log in to unmask]]
Sent:   25 October 2002 00:13
Subject:        Re: Dross on Solder Pot

Blair,
Have you entertained the thought that your thermocouple
wire is not giving you a correct temperature reading. Do you have a high
temperature thermometer in-house to verify what the actual solder temp. is
versus what it is actually reading.

Tony Steinke
AIT-Atlanta Inc.
----- Original Message -----
From: "Hogg, Blair K." <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 24, 2002 12:37 PM
Subject: Re: [TN] Dross on Solder Pot


> I turned the pot down yesterday to see what effect it would have. And that
> effect was - the operators turned it back up to (argh) maximum! It
probably
> is 550C!
>
> It is still as black as ever, and yes the color after wiping off the dross
> could be described as gold.
>
> Now I have to go educate.....
>
> I'm not sure how this is affecting the quality of our products. We
typically
> tin wires in harness prior to final assembly operations were they are
> soldered to a PCB. And we don't analyze this pot, when the dross gets
> excessive we just replace the solder.
>
> Lots of room for improvement in this process...
>
> Blair
>
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