What distinguishes brazing from soldering?

Brazing is distinguished from soldering primarily by the temperatures at which each process occurs. In brazing, the joining of metals is achieved at higher temperatures, typically above 450 degrees Celsius (about 840 degrees Fahrenheit). This higher temperature allows the brazing filler metal to flow into the joint and bond with the base metals, creating a strong joint.

In contrast, soldering involves lower temperatures, usually below 450 degrees Celsius, which means that the metal being joined may not reach the same levels of thermal distress as in brazing. The higher temperature associated with brazing results in a stronger and more durable bond compared to soldering, which is why this option is the correct choice.

Other options lack the specificity or correct characterization of the processes. For instance, the notion that brazing and soldering are the same overlooks the key differences, such as the temperature threshold necessary for each method. Furthermore, the suggestion about different metals being used does not accurately reflect the core distinction between brazing and soldering itself, as both processes can use similar base metals.