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February 2008

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 20 Feb 2008 12:42:14 -0600
Content-Type:
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Once you get down to the last little bit you can let it cool and just
lift it out, it does not usually stick. You always have at least a small
layer of dry dross/oxides/slag on the bottom.  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, February 20, 2008 11:54 AM
To: [log in to unmask]
Subject: Re: [TN] Solder Temperature...

Hey Steve,

That looks cool.  Too bad they aren't gold.

So how do you get the last few pounds out that are at the bottom of the
pot?  I haven't seen anything that could suck up the solder without
being melted or destroyed by the molten solder.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, February 20, 2008 12:34 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Temperature...

Hi Richard!

I'm emptying the pots because we're getting a new wave (a Soltec
Delta-5), and I'm going to use the solder in the pots we have to help
fill the pots in the new one.

I've finished the SN96 pot, and getting ready to do the HMP. Want to see
about $13,000 worth of solder? Check this out:

 http://stevezeva.homestead.com/files/1_down_2_to_go.jpg

SN96 bar solder is going for $19.95 a pound today!

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, February 20, 2008 9:35 AM
To: [log in to unmask]
Subject: Re: [TN] Solder Temperature...

Hi, Steve and Brian.
Interesting you should bring this up today....
Last week I was called to a client as they were having bigtime defects
with their wave solder process. Their wave solder machine had not been
properly maintained, with flux and solder splashed all over the
preheaters, solder splashes jamming the conveyor chains, no recent
solder analysis, and no pot maintenance performed whatsoever in at least
3 years. As a result, there was a huge amount of lead-clipping clusters,
dross clusters, and flux buildup inside the pot and the pumps and
impellers.
As I performed the maintenance over the weekend, I kept an eye on the
pot temp, as I did not want to burn out the heaters. I also noticed the
gold sheen as the temp rose to 550 F, before I shut it off to protect
the heaters and quickly get the remaining solder out and cleaned the
pumps, etc. I left those last 30 or so "bullion bars" off to one side,
refilled the pots with little nuggets (Tip: I used your tip of the
Baker's Secret loaf pans, but I also purchased a single Baker's Secret
miniature muffin pan and used that to pour nuggets to line the bottom of
the pot, rather than have to cut bar solder). I refilled with about 200
lbs of new solder, then used the "good" loaves removed at a temp of 470
F, and then topped off with about 10 loaves (400 lbs) removed at 550 F.
Result: the owner came in and thought I had purchased and installed a
brand new wave solder machine. They got a perfect solder analysis, and
first three jobs of a total of 180 fairly complex through-hole cards
were run. There were no solder defects. Zero. So I don't think the alloy
was degraded, but that is still a question in my mind.....

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, February 20, 2008 8:51 AM
To: [log in to unmask]
Subject: [TN] Solder Temperature...

Mornin' All!

If the solder in a wave solder pot gets a little hot, it doesn't really
degrade it does it?

Situation is; I'm emptying three solder pots, one 63/37 pot, one SN96
pot, and one HMP pot, the way the pots are designed is that the pot
thermocouples are located up towards the top of the pot. So as I lower
the level of the solder in the pot, at some point the thermocouples will
not be in direct contact with the solder and thus not be giving me the
actual solder temperature.

I've been cycling the heater power off when it looks like the solder is
getting pretty hot (it starts getting getting this golden sheen to it),
along with disconnecting the heaters when they start getting exposed as
the solder level goes down.

I've always emptied pots this way, and just started wondering if the
solder degrades at all if you heat it up beyond the liquidous
temperature. I know it makes a little more dross as the temperature
rises...

Steve

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