Why flux is used in brazing ?

To prevent steel from oxidizing during brazing process

To speed up brazing process

To clean the metal by dissolving any oxide already present

To make the final joint clean

slowly

rapidly

under cold water

at any rate

Viscosity

Density

Melting point

Capillarity

Brass to brass

Copper to copper

Steel to steel

Aluminium to aluminium

Iron

Brass

Tin

Lead