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Old 03-05-2012, 07:28 PM   #1
jmcdonald
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Default Is it bad to reheat/reflow solder joints?

Was soldering EC5 connector to the monster 8ga cables on my Turnigy battery and wasn't convinced all the solder flowed to make a good connection so I heated it up two more times until it was damn near bubbling over the connector. Will this not be as good a joint or in any way provide less power/create more resistance? Thanks, probably a dumb question but its bothering me.
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Old 03-05-2012, 07:34 PM   #2
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I wouldn't think so. If you got the solder up to its max temp it will be just fine.
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Old 03-05-2012, 07:39 PM   #3
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Quote:
Originally Posted by jmcdonald View Post
Was soldering EC5 connector to the monster 8ga cables on my Turnigy battery and wasn't convinced all the solder flowed to make a good connection so I heated it up two more times until it was damn near bubbling over the connector. Will this not be as good a joint or in any way provide less power/create more resistance? Thanks, probably a dumb question but its bothering me.
If your wire was not clean, (oxidized, contaminated) re-heating the joint won't magically clean it.

If your wire was clean, and properly tinned, and just didn't get enough heat the first time, re-heating is probably a good thing.

Heating solder in the presence of oxygen creates oxides at the surface. Fortunately, on an EC5, very little of the solder is exposed to oxygen.
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Old 03-05-2012, 08:38 PM   #4
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Thanks gentlemen. The wires were still pre-tinned from the factory after I desoldered them from their 5mm bullet connectors. I did re-tin them a bit more tho with some radio shack 60/40 just to be safe. I think I was just looking for a reason to re-do the joints becasue on the positive lead there is about 1-2mm of wire showing beyond the EC5 connector-OCD. Don't know if the EC5 bullets can be pushed back out of the blue housing if needed tho...
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Old 03-05-2012, 09:21 PM   #5
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I 'm now usng a micro torch to solder EC5 seems to work better ...
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Old 03-06-2012, 04:34 AM   #6
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If you can find some flux that works with the solder your using, it will help clean the oxidation on the joint and help the solder flow better. Then just clean the joint with alcohol. Or sometimes adding a tad more solder will help get the solder flowing also.
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Old 03-06-2012, 07:06 AM   #7
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An easy solution to the wire showing is to get some liquid electrical tape which comes in red and black and use a toothpick to cover the exposed wire next to the connector. It works great in very small areas.
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Old 03-06-2012, 07:35 AM   #8
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Thanks Wanderer and Doug, good to know about the liquid tape. I didn't know such a thing existed.
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