hi,

inquiring minds want to know:

a.  solder alloy id.
b.  date of last analysis.
c.  how hot is hot?
d.  are you working within the j-std specs?
e.  are the tinned leads meeting your quality standards?

phil

-----Original Message-----
From: Hogg, Blair K. [mailto:[log in to unmask]]
Sent: Wednesday, October 23, 2002 2:27 PM
To: [log in to unmask]
Subject: [TN] Dross on Solder Pot


Hello Technetters,

I'll readily admit that I'm not an expert on solder, and something has been
bothering me lately here at the shop, so I'll see what insight the forum can
yield.

We have a small solder pot used for tinning wires in our harness area.
Periodically as I walk by this pot I notice fairly thick black dross
covering the surface of the solder. This gets wiped away before they tin
wires, but lately I've noticed it turns brownish fairly quickly after wiping
off the dross from the surface.

What can be the typical causes of this? Could the pot be too hot? Could the
pot be contaminated (e.g. with copper)? Could it be contaminated because
it's too hot? I'm suggesting heat here because they run this pot at a fairly
high setting, I'm not sure why.

Thanks,

Blair Hogg
QA Manager
GAI-Tronics

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