Use of flux during soldering is done to__________________?
Correct answer: D. Prevent oxide formation
- A. Increase fluidity of solder by lowering its melting temperature
- B. Full up the joint gap
- C. Wash away surplus solder
- D. Prevent oxide formation
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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