Definition of Desoldering
Desoldering is the process of removing solder from a solder joint for troubleshooting and repair purposes. It can also be used to correct soldering mistakes. Does this Spark an idea?
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A Basic Solder Joint
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A soldering joint is the point where two or more pieces of metal are joined together with solder. A good soldering joint will be shiny, and it will have just enough solder to hold the joint together.
A Bad Solder Joint
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If a solder joint is moved before it's cool enough to solidify, it will result in an unstable connection and poor conductivity; a bad solder joint will also be a dull gray. Too much solder may bridge over to an adjacent joint, causing a short circuit.
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Solder Wick Method
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One desoldering method is to use a copper braid--also called a "solder wick"--to absorb the melted solder. The wick is placed between the soldering iron tip and the solder joint. The solder melts, and the wick absorbs it.
Desoldering Pump Method
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Another desoldering method is to use a pump to suck up the molten solder. The tip of the pump is placed next to the solder iron tip and the solder joint. Once the solder is melted, the pump's plunger is activated to remove the solder.
Types of Pumps
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Desoldering irons are available with squeezable pumps that permit single-handed operation. Desoldering stations are available with electric vacuum pumps as well.
Tip
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Both desoldering methods may be used to achieve more thorough solder removal. The method is harder because it involves using two separate tools at the same time.
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