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Forgot the flux?

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  • Member since
    December 2006
  • From: Piedmont, VA USA
  • 706 posts
Forgot the flux?
Posted by shawnee on Tuesday, September 30, 2008 8:28 AM

I am soldering some bridge rails together and just realized that before soldering the last section, I forgot to flux the joint.  I'm using rosin core solder and cleaned the joint area with a wire brush.  If i forgot to flux the joint before I joined it with solder, is this going to cause any problems long term in terms of oxidation or conductivity degradation?

Hoping it's all good...Shawnee

Shawnee
  • Member since
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  • From: Sierra Vista, Arizona
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Posted by cacole on Tuesday, September 30, 2008 8:45 AM
The resin core flux in the solder should be sufficient.
  • Member since
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  • From: Bedford, MA, USA
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Posted by MisterBeasley on Tuesday, September 30, 2008 8:59 AM
Yeah, I only use flux when I'm doing plumbing.  For electrical or track work, the rosin core solder gives you all the flux you need.

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Posted by jeffrey-wimberly on Tuesday, September 30, 2008 9:20 AM
I find that using a paste flux makes the job easier and gives me a better join.

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  • Member since
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  • From: Piedmont, VA USA
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Posted by shawnee on Tuesday, September 30, 2008 10:09 AM

Thanks guys...makes me feel more assured about that joint.

Best, Shawnee

Shawnee
  • Member since
    February 2002
  • 157 posts
Posted by karle on Tuesday, September 30, 2008 11:45 AM
Even if you go fluxless (is that a word?), use some flux to clean the tip of your soldering iron periodically, and it will tin much better.  Frankly, I strongly recommend flux even w/rosin core (but if you happened to miss fluxing a joint I wouldn't worry about it) 
  • Member since
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Posted by betamax on Tuesday, September 30, 2008 6:41 PM
Adding extra flux just makes the job go that much easier.

The flux in the solder (assuming you used flux core solder) should be adequate. Additional flux will just make it easier.
  • Member since
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Posted by JulesB on Friday, October 3, 2008 5:56 PM

Just look at the finished joint. If it's shiney like a mirror it's ok. If it has a dull sheen it may be a cold soldered joint. I have fixed more than a few computer mother boards by looking at them with a microscope and finding a dull joint and reheating to make it shiney.

Jules

 

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