What is the main function of flux in brazing?

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Multiple Choice

What is the main function of flux in brazing?

Explanation:
Flux in brazing serves to clean the surfaces and protect them during heating. It removes oxide films that form on base metals, and it helps prevent new oxides from forming while the filler metal is molten. With those surfaces clean and protected, the molten braze wets and flows into the joint more easily, driven by capillary action, which leads to a strong, continuous bond. Flux doesn’t color the joint, soften the base metal, or alter the filler metal’s melting point, so those effects aren’t its role.

Flux in brazing serves to clean the surfaces and protect them during heating. It removes oxide films that form on base metals, and it helps prevent new oxides from forming while the filler metal is molten. With those surfaces clean and protected, the molten braze wets and flows into the joint more easily, driven by capillary action, which leads to a strong, continuous bond. Flux doesn’t color the joint, soften the base metal, or alter the filler metal’s melting point, so those effects aren’t its role.

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