I don't know if your pot could actually reach 550C but it is possible. Sometimes to adjust Sn/Pb ratio you have to add one or the other which requires a much higher temp. I would not be tinning at much over 500F ( 260C ). And if you are keeping the pot really hot you would build up tin oxide on the surface fairly quick. That would start looking black.


-----Original Message-----
From: Hogg, Blair K. [mailto:[log in to unmask]]
Sent: Thursday, October 24, 2002 2:38 PM
To: [log in to unmask]
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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