Final answer:
Brazing filler metal will not flow over the base metal surface unless the base metal surface is heated to the brazing filler metal flow temperature.
Step-by-step explanation:
True
In brazing, a filler metal is used to join two or more metal pieces together. The base metal surface needs to be heated to the flow temperature of the brazing filler metal in order for it to melt and flow over the surface. This is necessary for the filler metal to create a strong bond with the base metal.
For example, if we have a copper tube and a brass fitting, we need to heat the joint area until the brass filler metal reaches its flow temperature and flows into the copper tube, forming a strong joint.
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