Answer:
A soldering process
Explanation:
Given that ,The filler metal's melting point temperature is less than 450 ° C.
Usually, the brazing material has the liquid temperature of the melting point, the full melting point of the filler material approaching 450 degrees centigrade, while the filler material is less than 450 degrees centigrade in the case of soldering.
Therefore the answer is "A soldering process".