Industrial Maintenance Technician Practice Test

Question: 1 / 400

What is the primary purpose of applying a flux during a brazing operation?

To increase the joint strength

To prevent corrosion

To promote good adhesion

To prevent formation of oxide films

The primary purpose of applying a flux during a brazing operation is to prevent the formation of oxide films. When metals are heated during brazing, they can develop oxide layers on their surfaces, which can prevent proper bonding between the base materials and the filler metal. Fluxes work by chemically reacting with these oxides, either dissolving them or providing a barrier that protects the surfaces of the metals from oxidizing. This ensures that the base metals remain clean, allowing for optimal wetting and flow of the filler metal into the joint.

While increasing joint strength, preventing corrosion, and promoting good adhesion are important considerations in brazing, the action of the flux in maintaining a clean soldering surface is essential for achieving a strong and reliable joint.

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