How to Cold Solder

by Sean Farmer

Soldering is the process of attaching the metal leads from various electrical equipment to a circuit board or other metal by melting a filler metal (called solder) onto the two metals. Certain electrical components, however, are sensitive to the heat from the solder and soldering iron. In order to solder these types of heat-sensitive components, a special silver conductive epoxy is needed. This process is called cold soldering and is relatively simple to do.

Set up your components on your circuit board in the same manner as to be soldered with a traditional soldering iron.

Press down on the syringe's plunger slowly, to press out a small amount of epoxy on to the metal leads. Be careful not to use an excessive amount of epoxy as this may cause shorts.

Inspect each solder point for bubbles, bridges and tombstoning. If any of these are present, remove some of the epoxy and re-solder the point. Test each component to make sure it holds in place after inspecting.


  • check Use clamps to hold components in place while you solder to prevent leads from moving or requiring excessive solder.
  • check Use as little solder as possible. It's easier to add more solder than to remove it.


  • close Do not run a current through the circuit if there are any defects in the solder, as this will cause shorts and potentially damage your components.

Items you will need

About the Author

Sean Farmer has been a professional writer since 2004. He has written many published works for various websites. Farmer is currently working towards a Doctor of Philosophy in psychology at Northwestern Oklahoma State University.

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