Introduction: Splice Wire Soldering

Before I learned about the lash splice I always had difficulties in soldering two wires together. The wires would be displaced by the soldering iron and would cause a bad solder joint. Using the lash splice method will prevent the wires from moving because we are using a small wire to hold the wires in place. The equipment that you will need for this projects are listed below.


  1. Wire Strippers
  2. Angled Cutters
  3. Tweezers
  4. Solder
  5. Flux
  6. IPA
  7. A brush
  8. 30 AWG solid core wire
  9. Helping hands
  10. Heat Shrink
  11. Solder Iron

Step 1: Step 1: Strip the Wires

Use your wire strippers to strip approximately 1/2 inch of insulation at the end of each wire.

If you are using mechanical strippers cut the insulation once then rotate the strippers about 90 degrees and perform another cut. This will make is easier to remove the insulation.

When pulling the insulation off of the wire rotate it clockwise. This will preserve the lay of the wires and keep the strands of wire tight together.

Step 2: Step 2 Pre Tin Wire

Pre tinning the wires makes it easier to solder the joint together. It also keeps the strands together.

  1. Apply a drop of Flux on the wire.
  2. Use the soldering iron and solder to apply a small amount of solder to the wire.
  3. Wick any excess solder away.
  4. Clean the wire with IPA and a brush.

Step 3: Tie the Wires Together

  1. Use a set of helping hands to hold the wires together.
  2. Line up the wires so that the pre tinned wires overlap.
  3. Use the 30 AWG wire to wrap the two wires together. If you don't normally use 30 AWG wire you can use a single strand of 20 to 28 AWG. Cut about 1 and 1/2 inch to 2 inches of solid core wire.
  4. Wrap the strand of wire about 5 times around both wires. If you are like me and have fat fingers use a pair of tweezers.
  5. Cut any excess wire with the angled cutters.

Step 4: Solder the Wires

  1. Apply some flux to the wires.
  2. Solder the wires with your soldering iron and solder.
  3. Make sure that the solder goes all the way around the two wires.
  4. Clean the wire with IPA and a brush when done.

Step 5: Heatshrink

  1. Apply heathshrink to the exposed wire to prevent any electrical short.
  2. Cut the heat shrink 1 and 1/2 times the length of the exposed wire.
  3. If you don't have a heat gun just use the tip of your solder iron.
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