Electrical soldering flux

One of the remaining items I had ordered for this month showed up today.  It’s a flux pen for soldering.  I’ve used flux before with soldering copper pipes, but didnt even know it was a thing with electrical soldering until this was recommended to me.   The concept seems to make sense though since you want to pull the solder into a joint much like you would a pipe joint.

I watched some videos tonight on how to use flux with electrical soldering.  Seems like its used for a variety of things including on board soldering as well as wire to wire soldering.  I ordered some soldering boards this morning from Amazon for me to practice on but until they show up I thought I’d try the wire to wire soldering to see how it works.  Im not sure why, but I decided to use rather thick gauge copper wire.  I guess I just had it laying around.  My first test was without flux and turned out much like I thought it would (Im still practicing, I know Im not awesome at soldering yet)…

So we ended up with a clump of solder on the top.  If we check the back we see that we dont have any at all…

AKA – I didnt put any back there so Im not sure what I was expecting.  I guess my thought was that some solder would seep through the copper wires and end up at least in the middle.  Not the case unfortunately.  So next I tried it with flux applied to the wires.  My results were better…

Notice how the solder really sucked into the wire.  You can still see the individual strands that make up the wire.  If we check the back we can see some solder soaked through but not all the way through…

In either case, it’s a much better joint.  I imagine once my soldering skills improve these connections will start to look better.  At least I hope they do.  Im anxious to get the soldering boards to try it out on there as well.

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