Q&A for How to Use Soldering Flux

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When should you apply flux when you're soldering?

Jones Welding & Industrial Supply Company
Industrial Welding Experts
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Jones Welding & Industrial Supply Company

Industrial Welding Experts

Expert Answer

Flux is applied when soldering to facilitate the flow of solder and remove oxides from the surfaces being joined. It is typically applied before heating the joint. flux can be in the form of a paste or a liquid, and it is used to clean the surfaces and promote proper wetting of the solder.

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Question

Do you need flux for soldering?

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This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.

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Staff Answer

It’s very difficult to solder without flux. Some types of solder, such as rosin core solder, have flux built in, meaning you won’t need to add extra to use them.

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Question

How do you use solid flux?

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Use your soldering iron to melt the solid flux, then dip the tip of your solder into it. The melted flux should stick to the solder.

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Can you use too much flux when soldering?

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If you use an excessive amount of flux, it will leave residue behind on your project. If this happens, you’ll need to clean off the excess flux, since some types are corrosive and can damage the surfaces you’re working with.

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