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Filler metals used in braze welding are characterized by having a melting point that is lower than that of the metals being joined. This is a crucial aspect of the braze welding process, as it allows the filler metal to melt and flow into the joint between the two base metals without melting them. By maintaining this lower melting point, braze welding can effectively create strong joints without compromising the structural integrity of the parent metals.

The ability of the filler metal to melt at a lower temperature ensures that the operation can be conducted at temperatures sufficient to melt the filler while preserving the physical properties of the base materials. This characteristic is fundamental to the success of the braze welding technique, enabling it to be used for a variety of applications, particularly where heat-sensitive materials are involved. Thus, the correct understanding of the melting point of filler metals is vital for effective fabrication and joining processes.