When splicing wires together, it is important to get an electrical connection that will keep conducting even after your soldering iron has cooled off. Paramount to this is getting a good mechanical connection between the wires, not just an electrical one.

I was able to use TechShop's soldering stations and helping hands to keep everything in place while I worked.

Step 1: Prepare Your Wires

Freshly stripped multi-filament wires need some attention before they will take well to being soldered.

First, the filaments of each wire should be twisted together, or pigtailed, to keep them orderly and behave more like a single entity.

I prefer to add some soldering resin to the filaments at this point too. It really helps the solder flow when tinning the wires. If using flux core solder, this step isn't critical, but it still does help.
<p>This is a great tip. Thanks.</p>
<p>Hello,</p><p>Have a very important question: can you solder the same way (as you mention above) for big wires that will transmit 220vAC? Is there a max voltage acceptable for tin soldering? If i solder two 220vAC wires together as above, will the electricity flowing through make the solder melt away?</p><p>Thank you very much.</p>
Hi Cristian,<br><br>If the wires are properly sized for the current you need, then the solder will not get hot enough to melt. I'm guessing you're trying to use current from your wall outlets? You'll be using 12 or 14 gauge wire, depending on the amperage needed by your project.<br><br>Wires inside power transformers for your home appliances are often soldered to the circuit board. The problem would be if your wires are too small for the current you use, they would get too hot. An example would be if you used a headphone wire to try to power your fridge. There would be too much electricity flowing through a small conductor and the whole length of the wire would get hot. The plastic insulation would be more likely to melt before than the solder, however.<br><br>Stranded wire for higher voltages is much better when soldering larger wires. The solder will 'wick' into the strands and provide a much better electrical connection. There isn't much of a mechanical bond if you try to solder large solid copper wires together (thinking house wiring style wire here).<br><br>PLEASE use a mechanical bond to connect large wires. Never rely on just solder to hold things together, especially when dealing with lethal currents. Home improvement stores will sell crimp-on style connectors that will let you splice 12 or 14 ga. wires together without soldering, or you can even use wire nuts used in house wiring. Combining soldering with one of these mechanical methods will yield the best electrical connection.<br><br>Since I don't know exactly what you're doing I'll go ahead and say: It is against building code and EXTREMELY dangerous to splice cables inside a wall. It must be done in a junction box using appropriately sized wire nuts.<br><br>Be sure to insulate your splices!
<p>Thank you very much, this is exactly the answer i was looking for! </p><p>I am building my own CNC and i need to solder some wires from my wall plug to multiple components that require 110vAC, and i wasn't sure if it would pose a resistance to the electricity flowing (thus melting the solder).</p>
<p>how can i cite this page?</p>
<p>Thanks for this! Useful for project!</p>
<p>Cheers for this wee guide, just what I needed. </p>

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