Use of flux during soldering is done to__________________?
Correct answer: B. Prevent oxide formation
- A. Increase fluidity of solder by lowering its melting temperature
- B. Prevent oxide formation
- C. Wash away surplus solder
- D. Full up the joint gap
Explanation
Flux removes existing oxide films and prevents further oxidation of the metal surfaces during soldering, allowing the solder to wet and bond properly. It is not primarily used to fill the joint or lower the solder's melting point.
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