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5. After cleaning with an abrasive, metal must be treated with a ____ before soldering.​

5. After cleaning with an abrasive, metal must be treated with a ____ before soldering.​
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5. After cleaning with an abrasive, metal must be treated with a ____ before soldering.​

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User Covfefe
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After cleaning with an abrasive, metal must be treated with a **flux** before soldering. Flux helps to prevent oxidation and facilitates the flow of the solder, ensuring a strong joint.
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User Alex Steinberg
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