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Jul 28, 2001, 03:24 AM
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Foxtrot's Avatar

How do you tell if you have a cold solder?


I'm reworking some battery packs. And was just wondering if there was a way to tell if you have a cold solder joint.

Foxtrot
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Jul 28, 2001, 05:15 AM
Old Desert Rat
Arizona Chuck's Avatar
By looks, look real close. If you can't say its perfect, redo it. Another way of putting it is, if you are wondering if it is right, it's not.
..AZ Chuck
Jul 28, 2001, 06:52 AM
Registered User
Andy W's Avatar
If you can see it, it needs to be shiny. If it's dull, it's bad. However, tough to see between cells!
I always try to pull my cells apart after soldering them. I also drop the soldered up strips of cells (before I complete the pack) on the bench a few times to see if anything gives.
..a
Jul 28, 2001, 05:28 PM
Registered User
If it's a lump it's bad. If it's flat and look like it's blending with the surface, it's good.
Jul 28, 2001, 06:33 PM
Space Coast USA
hoppy's Avatar
Shiny is good but I've found it hard to get on a battery because of the great heat sink capacity of the battery. If the solder is all liquid when I remove the iron, it's a take for me. The iron has got to be hot enough to melt it in under a second. You should be able to see the solder hardening in a few seconds after the iron is removed.
hoppy

PS Andy's comment on dropping the pack reminds me of the technique ham radio operators use when getting a new rig...drop it on the table from a couple inches up to see if there are any loose connections. Better to have the factory fix them while under warranty.

I've been using this technique on my RC eauipment. Dive it in from 50' and see if it still works.
[This message has been edited by hoppy (edited 07-28-2001).]

[This message has been edited by hoppy (edited 07-28-2001).]

[This message has been edited by hoppy (edited 07-28-2001).]
Jul 28, 2001, 07:12 PM
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Foxtrot's Avatar
Thanks. Looks Like I'm doing something right for a change.

Foxtrot
Jul 28, 2001, 07:56 PM
Registered User
Andy W's Avatar
Quote:
Originally posted by hoppy:
Shiny is good but I've found it hard to get on a battery because of the great heat sink capacity of the battery. If the solder is all liquid when I remove the iron, it's a take for me
The iron doesn't need to be all that hot for solder to stick to a cell - but you DO need to have a large enough tip to be able to hea the end of the cell without all the heat being drawn out of the tip. 40W is more than enough to solder any size cell, more heat (power) doesn't help. That's why the guns are so useless - no mass in the tip.
..a


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